Celestory FAQ 🇬🇧

This FAQ answers the most common questions about Celestory, the no-code platform for creating serious games, AI chatbots, and interactive experiences.

🔎 1. Definition and Features

1.1 What can I create with Celestory?

AI has unlocked content creation at an unprecedented scale — everyone can now generate text, images, audio, and video in minutes. But what do you do with all that power? Celestory lets you turn it into real products: AI apps with your own rules, your own data, and your own identity. Through the visual modeling of your expertise, you can train your AI to build internal tools for your organization or deploy experiences to the general public — without writing a single line of code.

The more content you give your AI, the more important it becomes to master key concepts and choose the right LLM provider. Celestory is designed to make this journey accessible to non-technical creators: it gives you direct control over models, prompts, and logic through a visual interface built for humans, not developers.

AI can be activated at two levels:

• As a creator, you use AI to generate and refine content in the editor (text, images, video, audio).
• For the end user (called a "player" in Celestory), AI can be embedded directly into the experience to enable infinite, dynamic generation — personalized responses, on-demand images, speaking avatars — all triggered in real time during gameplay.

💡 Celestory works perfectly without AI too. You can build rich, interactive experiences using purely no-code logic. AI is an accelerator, not a prerequisite.

Enjoy maximum immersion through numerous formats: 📱 AI Apps, 💬 AI Chatbots, 📚 Choose Your Own Adventure stories, 🖼️ Visual Novels, 🎴 Cards, 🚪 Escape games, 🎬 Interactive films, 👆🏻 Point & Click, ❓ Quizzes, 🏥 Serious Games…

AI Apps are web applications fully created with Celestory and AI, instantly deployable as a PWA (Progressive Web App) or embeddable via iFrame:

🌐 Website  ·  📝 Blog  ·  📋 Form  ·  🤝 Meeting  ·  🎤 Presentation  ·  📖 Catalog  ·  🏠 User portal  ·  🎓 Online school  ·  📄 Documents  ·  🌍 Localisation  ·  📷 QR code  ·  🏅 Certification  ·  📊 Dashboard  ·  👁️ Data view

With No-Code and Vibe Coding powered by AI, the possibilities are truly infinite — any content, any tool, any experience you can imagine can be built and deployed without writing a single line of code.

Feel free to discover the community's creations and start your first project in a few minutes.

1.2 What is a sovereign AI model?

A sovereign model is an AI model developed by a European company (e.g., Mistral AI, based in Paris 🇫🇷) or in open source (e.g., Llama by Meta, Flux by Black Forest Labs), independent of the large American tech platforms.

Main advantages: they can be downloaded and run locally on your own servers, without sending your data to a third party — ideal for legal, medical, or corporate use cases requiring maximum data confidentiality.

For organizations requiring full data sovereignty, Celestory offers the Celestory AI Cube — a nano data center solution that lets you host Celestory itself, your AI apps, and your LLM models on your own infrastructure. Available as a Docker image, it can be deployed on-premise or in a private cloud with a single command. Contact us to learn more.

1.3 Which text AI models are available in Celestory?

Celestory gives access to the following providers directly from the editor:

Mistral and Llama (Meta) models are sovereign/open-source and can be downloaded for local execution after validation.

1.4 What is Vibe Coding?

Vibe Coding is the ability to iteratively create or modify an application by conversing with an artificial intelligence. Instead of manually writing programming languages (HTML, CSS, JavaScript), you give highly specific textual instructions (or "prompts") to the AI.

The AI instantly generates and updates the logic and interface of your application. In Celestory, you can embed this generated code within HTML5 blocks to create custom tools, such as asking the AI to develop a card mini-game or a full-featured "To-Do list".

1.5 What is no-code?

No-code means creating software and applications without writing programming languages. Instead of typing code (JavaScript, Python, HTML…), you build everything visually: assembling blocks, drawing connections, filling forms.

In Celestory, everything is built in the Graph — a visual flowchart where you drag, connect and configure blocks to describe the logic of your experience. No developer knowledge is required. Even complex features like AI integration, database connections, or conditional branching are handled by filling in text fields.

No-code makes digital creation accessible to everyone: teachers, trainers, marketers, entrepreneurs — no matter your technical background.

1.6 What is the AI Generation menu in Celestory?

The AI Generation menu is accessible directly from the Celestory editor and is organized into 5 tabs:

A quota counter at the top of each tab shows your AI credit consumption in real time (e.g., 45 / 200 generations).

1.7 How do I use the Text tab to generate content with AI?

The Text tab offers an integrated conversational chat to interact with language models (LLMs). You enter a message, optionally attach text variables from your project, and the model generates a response rendered in Markdown in real time.

Key features include: model selection, a token counter (showing history usage vs. context window), input estimation before sending, and the ability to attach project variables (style guides, game rules, methodology) to the prompt in one click.

1.8 How do I generate images with AI in Celestory?

The Image tab offers two modes:

• Text to Image: Describe the image you want (style, colors, atmosphere) and the model generates it from scratch. Supported models include Nano Banana, Flux 2 Klein 4B, and GPT Image 1.5.
• Image to Image: Provide one or more reference images and a prompt describing the changes. The model preserves structure and style while applying your instructions. GPT Image 1.5 also supports inpainting (retouching a specific masked area only).

1.9 What can I create with the Video tab?

The Video tab offers 6 generation modes:

• Text to video: Generate a synthetic video from a text prompt (LTX-2, Veo 3.1, Kling, Wan).
• Image to video: Animate a still image based on a movement prompt.
• Start and end frame: Provide a start image and an end image; the AI generates all intermediate frames.
• Image + Audio (AI Avatar): Synchronize lip movements of a portrait image with an audio file to create a speaking avatar.
• Video to video: Extend or modify an existing video.
• Motion Control: Apply the movements of a reference video to a character image (Kling v2.6).

1.10 What does the Audio tab allow me to do?

The Audio tab (powered by ElevenLabs) offers 4 modes:

• Text to Speech (TTS): Generate voice-overs from text with 20 available voices, with control over stability, similarity, and speed.
• Music: Generate an original music track from a text description of the style and atmosphere.
• Sound Effects: Generate tailor-made sounds (button clicks, ambient environments, action effects) with adjustable duration and loop option.
• Multi-voice Dialogue: Compose a conversation between multiple characters, each assigned a different voice, exported as a single continuous audio file.

1.11 What is a token and why does it matter in Celestory?

A token is the basic unit used by AI models to process text. One token corresponds approximately to ¾ of a word in English (e.g., "hello" = 1 token, a 10-word sentence ≈ 13 tokens).

Each model has a context window — the maximum number of tokens it can process in a single conversation. Celestory displays the token count in real time (history vs. context window, e.g., 12,530 / 256,000 tokens) so you can optimize your prompts and avoid exceeding the model's memory.

1.12 What is a competency prompt and how do I use it?

A competency prompt (also called System Prompt or Role) is a reference document — style guide, methodology, business rules — that you attach to your AI requests to guide generation. For example:

• For Vibe Coding: attach your HTML/CSS style guide as a variable so the AI respects your colors and typography.
• For document generation: attach a Markdown methodology so the AI follows your structure conventions.

In Celestory, you store these guides as text variables in your project and inject them into any AI conversation with one click.

1.13 What are the in-game AI blocks available to players?

Two blocks allow players to trigger AI generations during play:

• 🟦 AI text request block: Connects your scenario to a language model. Inputs include Prompt, Role (System Prompt), History, Model, Temperature, and optional Images. Outputs include the Generated Response, a Success signal, and an Error signal.
• 🟦 AI image request block: Transforms a text description into a dynamically generated image. Inputs include Prompt, Model, optional reference Image, and Negative Prompt. Outputs include Image URL(s), Success, and Error.

⚠️ Every player-triggered AI request draws from the creator's AI credit quota. Monitor consumption carefully when deploying at scale.

1.14 How do I manage AI credit consumption in player experiences?

To control costs when players trigger AI requests:

1. Limit requests per session, per player, or per scene.
2. Use lightweight models (ministral-3b, Nano Banana) for frequent interactions; reserve premium models for key moments.
3. Monitor consumption in the Previous generations tab (filterable by "in-game" source).
4. Handle errors gracefully with the Error output of AI blocks to provide fallback behaviors (pre-defined responses, default images).
5. Use strict System Prompts to constrain AI behavior and reduce unnecessary tokens.

1.15 What is the difference between a negative prompt and a system prompt?

• A Negative Prompt tells the AI what it must not include in the generation (mainly used for image and video). Example: "no blur, no deformed hands, no text".
• A System Prompt (or Role / Competency Prompt) sets the AI's personality and behavior rules before a conversation. Example: "You are a sarcastic wizard who only answers in verse". It is used for text generation to maintain a consistent character throughout the conversation.

1.16 How do I view and reuse my past AI generations?

The Previous generations tab gives access to the complete history of all your AI generations (text, image, video, audio). You can filter by type (text, image, video, audio) and source (editor or in-game), paginate through older generations, and reuse previously generated outputs without regenerating them.

1.17 What is a serious game?

A serious game is a "video game" with a serious purpose that allows learning through an application that digitizes real-world logic. Celestory allows you to create more than simulations — real experiences that assist each person in your audience to train or perform actions, such as accessing private data you share with them (documents, recommendation lists, etc.) and controlling the software you give them access to (email, drive, CRM, etc.).

1.18 What are the differences between a serious game and e-learning training?

E-learning is a format closer to a linear presentation, usually with a quiz for evaluation. A serious game is more immersive. It contains content (which can also be played linearly), but also offers an experience that is personalized according to the user's actions: new scenario branches, personalized AI responses, profiling with numerous scores such as rankings, badges, or challenges. Finally, a serious game can have different formats: interactive presentation, chatbot, interactive comic strip, cards, etc.

1.19 What is the difference between an escape game and a serious game?

An escape game is a game where the principle is to find the exit from a locked place. It can be transformed into a serious game if there is a pedagogical aim. It can be designed autonomously or in "phygital" mode (physical-digital), i.e., a digital experience in addition to a physical one (e.g., scenarios, clues, objects in digital...).

1.20 What are the advantages of serious games?

First of all, because of the game aspect, it is an attractive experience that puts the user in a situation.

Gamification maximizes user engagement through a reward system.

A serious game can save the user's progress online through different sessions. Connecting to a relational database allows, for example, to offer multi-user experiences.

The serious game allows personalization of the experience through the memory of the user's actions but also enables real-time study of the multiple factors that explain player behavior.

1.21 Can we make games on any subject?

This is the beauty of Celestory — you can create games on all the subjects you want, including the most "niche" where no game exists yet, thanks to the accessibility of creation.

You can create your game and download it to distribute it wherever you want. By hosting it publicly on Celestory, you must ensure that you have all the operating rights and that the content is entirely legal.

1.22 Why make a serious game?

To raise awareness among your audience, while monitoring the multi-causality that explains the different approaches by that audience, allowing you to confirm or identify categories of behavior.

1.23 What are the advantages of Celestory? Can I create alone or in a team?

A Celestory serious game is the guarantee of having an experience that is easy to evolve visually without coding ("no-code"), alone or in a team. Your project will be easily updated by accessing the data you share with it. You can integrate AI capabilities for infinite queries, and you can even integrate it into many software programs to automate your work (send emails, collect data, summarize documents...).

Compatible with all devices and deployable instantly, Celestory technology is also the best way to create an immersive "digital product", which you can monetize if you wish.

1.24 Does Celestory offer team collaboration features?

Yes, Celestory allows you to grant visibility or modification access to your game project to members of your team. It is highly recommended to share your projects in read-only mode to prevent collaborators from accidentally modifying the Graph (scenario).

Your collaborators can then Duplicate the shared project from their dashboard to their own "My projects" space, allowing them to work on their local copy safely without ever affecting the original creator's version.

1.25 Can we customize the Celestory interface and the games created with our own graphic charter and branding?

Yes, Celestory offers extensive visual customization. You can modify colors, fonts, background images, and the overall style of your experience from the Module Settings > Application Style panel. You can also upload your own logo, apply custom CSS, and build custom UI components (ATH menus) to fully reflect your brand identity.

1.26 How does Celestory handle translation into different languages?

Celestory supports more than 200 languages and offers complete tracking of the number of blocks you have translated and how many you have left to translate. Celestory generates a PO file that can then be pre-translated with AI.

1.27 What technology is the Celestory engine based on?

The Celestory engine is mainly developed in React. Games are created in HTML5.

✏️ 2. Creation and Content

2.1 How do I make a serious game?

Just go to www.celestory.io and create an account to start creating a serious game in minutes, starting from a new project or an example to customize.

2.2 What tools to use to create serious games?

There are two types of tools to create serious games: classic video game engines (Unity, Unreal Engine...) which require specialized developers, and no-code tools accessible without technical knowledge, such as Celestory, which allow you to visually build the game scenario, without writing a single line of computer code.

2.3 Is it necessary to have programming skills to use Celestory?

No mastery of computer languages is necessary because the creation is based on content that everyone can produce without programming with code (text, visuals, choices, indications...).

2.4 What types of content and resources can I integrate into Celestory?

In Celestory, you have an online storage service for image, sound, and video files. You can directly integrate all your textual content in many forms (dialogues, notifications, choices...) while associating it with files (characters, sets, objects...).

It is also possible to import content from the web in real time (image address, YouTube video, website...) or from your software (emails, spreadsheets, drive, CRM...).

2.5 Where can I find resources to help me create my serious game?

You can consult the Celestory documentation, watch the creation examples, access the support chat, and even from the tool when you are in the middle of creation. If the chat does not load, you can access it at this address. You can also contact us for support or personalized training at contact@celestory.io.

2.6 How to choose and define your serious game to create your online training?

A serious game must first be defined according to your priorities: it is a balance between staging (text, then image and video) or richer and more personalized content (more branches, more advanced indications with AI...).

You can save a lot of time by starting from an example format to customize directly.

2.7 How to ensure the engagement of players and learners in a serious game?

Engagement — the ability to stay and return to the experience — will be maximized with a personalized experience and attractive content. Give the game a memory of the players' actions using variables, which you can then save locally via the checkpoint blocks or in the cloud via a database like Airtable (or Google Sheet, Microsoft Excel...).

2.8 How long does it take to create a serious game with Celestory?

You can create a prototype of a serious game in a few minutes, then improve its personalized content and staging ambition in a few hours.

2.9 How do I integrate AI into my creations?

AI can be integrated at several levels in Celestory. There are AI creations (text, image, sound, video) that can be integrated into your dedicated hosting, or generated in real time at the player's request (text, voice, image), for example to make NPCs (non-player characters) talk endlessly. Watch the Celestory AI tutorials for Replies/Choices, NPC Audio, or AI World Scenery.

2.10 What style can we do? 2D, 3D, more realistic, comics?

Celestory supports all 2D content because it is easy to design and modify, manually or using generative AI. 3D video game content is not supported because it does not work in a simple browser, requires a lot of computing power, a whole creative team, and requires being a specialized developer in a video game engine.

The available game formats are very diverse: chatbot, visual novel (interactive comics), clickable areas, virtual tours, escape games, interactive films, quizzes, cards, memory games...

All kinds of content are then adaptable: educational, police, fantasy, romance, science fiction...

2.11 Can we do VR?

Yes, VR systems now accept PWA (progressive web apps) in 2D floating in the virtual world, including augmented reality.

2.12 What support do you offer to create our serious game?

You can contact us via the following links for tailor-made training and co-creation with the help of experts recognized in serious games and AI content creation.

2.13 Is Celestory based on an open-source project?

No, Celestory is proprietary software. The sources of the games created in HTML5 are transparent.

2.14 Do I need an internet connection to run Celestory?

For creation yes, not necessarily for the user of the games.

2.15 How can I save my project?

Just click regularly on the save button or use the shortcut Control+S (PC) or Cmd+S (Mac). Saving is not automatic to avoid save conflicts between multiple creators who want to explore different versions of the project.

2.16 Can I save my files locally?

Yes, it is possible to export Celestory project modules offline and merge or re-import them.

2.17 What is the maximum size of a project?

A project has no graph size limit. The limits of AI usage and online file storage depend on your subscription.

2.18 Is there already a content bank that I can use?

Yes, you can use +1500 content items (characters, sets, music) present in the example projects.

2.19 How do I add content?

Just open the blue main menu of your project and select the Files option. You can then create folders and upload your content (image, video, sound).

2.20 What are the best audio, image and video file formats to use?

Supported formats are: PNG, JPEG, GIF, MP3, MP4.

2.21 Is there a size/weight limit to the content I can import?

There is no strict file weight limit. However, be careful not to upload files that are too heavy, as your user will have to pre-load them for the experience to launch correctly — this will depend on their internet connection.

2.22 Where can I find illustrations, content for my game?

You can find illustrations of characters, sets and objects in the examples, as well as create them via generative AI tools such as Dall-E 3, Leonardo or Midjourney.

If you want advanced artistic direction and personalized artistic support, you can call on our experts (illustrators, videographers, sound engineers...).

2.23 Are there any templates/models? How do I import a template or an existing project?

There is a page of examples that you can easily copy. Once copied, you can modify them. If you want to import them into an existing project, just export and import the modules.

2.24 Where are there game examples?

Yes, there are examples of graphs of games to understand their design, but also many demos of public games.

2.25 Are there any tutorials?

Yes, in the page of example projects of games, the Step by Step section allows you to understand the different concepts of Celestory as you go through the projects. The first tutorials allow you to be autonomous in a few hours.

2.26 Can I add difficulty levels to my game?

The difficulty of your game depends on its design. Use skills such as logic, memory, checkpoints or even speed of action with Quick Time Events to adjust the difficulty.

2.27 Can I preview and test my game?

You can and should test your game very often using the "Play Current Module" button. You can test your game from any part of the tree structure. Finally, you can make private publications of the game for your beta testers and collect their feedback before distributing it more widely.

2.28 What is a variable?

A variable is an element that changes value. It has an initial value (at the launch of the experience) and can change in a declarative way (e.g.: I choose the first name of my character), behavioral (e.g.: Make a choice option that removes any going back), automatic (e.g.: number of actions remaining in an escape game) or contextual (e.g.: when an email is received, when another user changes an element).

There are different types of variables: true/false (Boolean), numerical (e.g.: X=12), textual (e.g.: Email) or lists (e.g.: Objects in an inventory).

2.29 I have a game idea, but I don't know where to start. How can Celestory help me structure my project?

Start by looking at the page of examples of projects. Start by creating your project in Chatbot format in text version. Think of a first part of your scenario to create a few different endings that will allow you to differentiate users. Then build a simple scenario and distribute it to your test users. Improve it with their feedback.

Think about the minimum content format needed to achieve a first digital experience with a first measurable objective. What information should be recorded for each user between sessions? This information will be translated into variables.

2.30 Can I access or modify the source code of my game?

Yes, once your HTML5 game is exported, you can modify it by coding. However, it will always be faster to go through Celestory's no-code interface.

2.31 Can I add some code to my games?

Yes, you can import your own Javascript and CSS code into your game. In particular through the Javascript and CSS blocks and the CSS option in the menu items (custom CSS).

2.32 I want to contribute to the project, how do I do it?

Thank you for joining us in our mission to make game creation more accessible!

Start by joining our discord community and follow us on platforms like Linkedin, X, Facebook, Instagram, Tiktok or Youtube. Your comments and support posts are very valuable to us.

If you want to join the team, send us an email.

🚀 3. Use and Applications

3.1 Why use serious games in my company?

Serious games are an alternative to awareness raising, training or linear questionnaires. Immerse your audience in a personalized experience in which you can track their engagement and follow the progress of each person with the connection to your company's tools (Outlook, Teams, Excel...).

3.2 Can I use Celestory myself to create a serious game for my clients?

Celestory serious games allow you to present your offer to each of your clients/prospects in a personalized way, just as you would in front of a person.

3.3 Do you only offer digital serious games or do you also do face-to-face?

Celestory allows you to create digital and hybrid training courses to complement a physical training experience. Our experts also offer tailor-made training on the creation of personalized content with artificial intelligence — do not hesitate to contact us.

3.4 What are concrete examples of using Celestory in different fields of activity?

Some examples: A gamification tool for salespeople in the form of a virtual customer chatbot; A digital twin in an interactive visit of a production plant connected to real-time data; A sponsorship application for newcomers in the format of a profile card with drag and drop matching.

3.5 What measures are taken by Celestory to combat cheating and data manipulation in serious games?

Celestory allows you to store sensitive data in external databases (Airtable, Baserow) with server-side validation. You can use server logic (via webhooks or APIs) to verify submissions and detect anomalies. Score calculation can be done server-side rather than client-side to prevent manipulation.

3.6 Do you offer self-study training or certifications to master the use of Celestory?

You can train independently via the Celestory Academy. If you complete the advanced level, you will receive a certification and exposure to Celestory users and partners.

3.7 Is it possible to choose the AI model used in Celestory? Which LLMs are supported?

In the included Voltask automation tool, you have the choice of the AI model you want (text generation, images, sound...): Mistral, ChatGPT, Gemini and others to come. Installation on your own server is also possible.

3.8 Can I put a game score?

There are an infinite number of scores and combinations of scores in Celestory, as well as saving them between sessions.

3.9 Do you have games, serious games, ready to be implemented?

There is a section of small ready-made serious game experiences on the examples page. Long experiences on specific topics are not yet offered "off the shelf". Do not hesitate to contact us if you see opportunities in this regard.

3.10 How can your experts adapt a serious game to the specific needs of my company?

Our design experts have a proven analysis method in the rapid creation of serious games. The ambition, complexity, schedule, resources, content, format, distribution and access granted to the intelligent experience will be studied to offer support that allows you to quickly become autonomous for the modification and evolution of your digital solution.

3.11 Can we track the progress of our learners?

Yes, learner tracking is a key element of Celestory serious games. There are analytics and deterministic statistics to determine the multiple causalities that explain different behaviors. This also allows for quantitative and qualitative analyses to better understand the use of the serious game.

Finally, databases allow you to track all the data of each user that you measure.

3.12 How to assess and validate knowledge and skills for certification or diploma training?

To validate knowledge in a serious game, you must break down these prerequisites into different scores (numerical, true-false, manual or AI qualitative analyses) whose validation can be as many combinations as you want (e.g.: Validated if X≥7 AND (Y=true OR Z=false) etc....) on all the data as the player/learner progresses through the sessions.

3.13 What is the maximum number of players for a Serious Game?

The number of players is virtually unlimited. Databases (centralized online tables that create a centralized memory) can support hundreds of thousands of people and more.

3.14 Do Celestory games adapt to mobile format? Tablet? Computer?

Yes, Celestory games are "responsive": they adapt to the size of any user's screen. You can adjust the settings to optimize the space between each element and choose a preferred ratio.

3.15 Is there a user community?

Yes, you can join our Discord community chat.

3.16 Do you offer events, webinars or workshops to allow users to meet and share their experiences?

You can follow our participation in events on our social networks. If you would like us to participate in one of your events you can contact us by email.

📲 4. Publication & Monetization

4.1 On which platform can I install and publish my Celestory serious games?

You can distribute your Celestory creations without coding via a simple link by email, conversations or on social networks. PWA (progressive web app) technology allows you to install the game on all systems, while keeping it automatically updated.

Download in Windows and MacOS format is available automatically, and allows you to distribute on different PC/Mac stores.

You can also request the transformation into a Google Play or Appstore app via an additional coding service that adds a commission from Google or Apple, validation processes and additional developer costs/resources to take into account.

4.2 Can we monetize our creations?

Yes, Celestory allows you to apply the monetization you want: paid or free, in-app purchases, subscriptions, credits, licenses to be invoiced yourself...

4.3 Are there any royalties to pay?

Celestory does not take any commission on your sales. This is a great way to grow your business.

4.4 Are serious games created with Celestory compatible with LMS?

All LMS (Learning Management System, online school systems) allow you to add "embeddable" content like a YouTube video or a Celestory experience using the iFrame integration!

4.5 Can I use serious games for promotion?

Yes, serious games are a very good way to promote because they can allow you to better discover your offer compared to the unique profile that everyone will express in the serious game. You can also pre-fill the data of an experience from a unique link sent to each prospect, so that the experience is personalized from the start.

4.6 Can this be used to raise awareness?

Yes, serious games can punctuate an awareness campaign based on actions carried out or not (e.g.: filling out a form, before or after the experience), as well as on date verification (e.g.: unlocking chapters from one week to the next).

4.7 Is it possible to host serious games created with Celestory on our own servers?

Yes, you can download your serious games to your own server, locally or on your dedicated cloud. Celestory serious games can be launched offline, while continuing to automate events or actions on the software you grant them access to, such as updating a database or receiving/sending emails.

4.8 Does Celestory offer features to make serious games accessible to people with disabilities?

Celestory games are in HTML5, whose interface is simple and readable by accessibility tools.

4.9 Can we have our own custom domain name?

You can integrate your Celestory serious game into any website (WordPress, Wix, Webflow, Notion...) as you would integrate a YouTube video, using the iFrame integration code. You also have the possibility to create any redirection to the Direct Link which allows the installation of a Celestory game in the form of an icon directly accessible from the system.

🧪 5. Trial and Subscription

5.1 How can I try Celestory?

Just create an account on https://www.celestory.io/.

5.2 What are the limits of the trial version?

The trial version allows you to create your serious game and distribute it for 15 days. To unlock more time, the recovery of +100 data, the automation of tasks by connecting your different software, statistics as well as many features, you can take a subscription.

5.3 Do I need a minimum required configuration?

No, the creation and use of Celestory serious games works on all devices capable of running an internet browser. Games can also be available offline.

5.4 Should I use one browser more than another?

We optimize Celestory with the Chrome browser.

5.5 How to be aware of Celestory news?

You can create an account to be the first to discover our new products, as well as join our Discord community.

5.6 I found a bug on Celestory, how to report the information?

Thank you for your participation in improving the user experience! You can report it to us via our email contact, via the chat in the tool or dedicated text lounge on Discord.

💳 6. Prices and License

6.1 Do you allow games to be published on a dedicated marketplace?

Yes, you can publish your games on the Celestory Games marketplace by filling out this form.

6.2 What is the price of designing a serious game?

You can start creating your serious game for free for 15 days. Beyond that, for your game to continue to evolve and collect data or connect to your software, you must choose a subscription.

6.3 What are the license terms?

The license terms are on our dedicated page.

6.4 What are the prices?

Prices start at €19/month to create, access and deliver AI experiences. A 50% discount is applied for an annual commitment.

6.5 Do my creations belong to me?

Your creations belong to you.

6.6 Do you offer discounts for students, schools?

Celestory is already a design software for schools and training centers, with a price much lower than the costs of classic alternatives to creating a serious game. However, a 50% discount is applied for an annual commitment.

6.7 Is there a possibility of having a discount for group licenses?

Yes, you can contact us for special requests.

6.8 Can I cancel my subscription whenever I want?

Yes, as soon as your commitment period ends.

6.9 What happens to my project if I stop my subscription?

Without an active subscription, your project can no longer be modified and it stops accessing and collecting your data. Resuming your subscription will allow you to recover your project.

6.10 Can I share a personal license with my friends?

No, sharing a personal license is not allowed as it can cause serious backup problems that could corrupt the project. For team projects, a professional license is required.

6.11 Is my content used to train AI?

Your content remains private and is not used to train AI.

6.12 How much would it cost if you developed my game?

The cost of creating a game depends on many factors: the ambition of the content, the staging, the logical complexity, the schedule, the resources, the content, the format, the distribution...

Contact us so that one of our experts can present you with support adapted to your needs. Our goal is to make you autonomous in your creation.

🤖 7. AI Integration (Requests & Prompts)

7.1 How do I integrate a text AI into my Celestory module?

Add an AI Request block, connect it to a Format block that composes the System Prompt (AI role, constraints, context). Connect the output of the user input to the input of the AI Request. Connect the result to a Dialogue block to display it.

7.2 How do I structure a good prompt for professional results?

An effective prompt includes 6 pillars: Objective/Task, Role/Persona, Context and Target, Format and Tone, Constraints (prohibitions, limits), Evaluation (success criteria). A short and precise prompt systematically outperforms a confused block of text.

7.3 How do I create a chatbot with conversation memory?

Create a text variable history (initially empty). At each exchange: (1) capture the input, (2) concatenate with the history via the Assignment block (History + Player: + input), (3) pass to the AI Request by injecting {{history}} into the prompt, (4) add the AI response to the history. Use a Repeat block to limit the number of exchanges.

7.4 What is the "temperature" of an AI model and how do I adjust it?

Temperature controls the AI's creativity. Low (near 0) = factual, strict, and predictable answers. High (> 1.0) = varied and creative answers but risk of hallucinations. For business uses, always favor a low temperature.

7.5 How do I choose the right AI model for my application?

• Mistral: fast, economical, Zero Data Retention (GDPR), ideal for frequent conversational exchanges.
• Gemini Flash: context of one million tokens, very fast, for consumer interfaces.
• Claude 3: excellent logical reasoning and literary quality, extensive context.

To compare models (cost, tokens, hosting): use OpenRouter.

7.6 How do I force the AI to answer in a specific format (JSON, HTML, Markdown)?

Add an explicit directive in the System Prompt: "Only reply with the JSON code matching the following schema" or "Format your response exclusively in Markdown, without quotes". Then use a Decode JSON block to exploit the structured data.

7.7 How do I create a library of reusable prompts?

Store each calibrated prompt in a dedicated Text Variable (e.g., Strategy_Consultant, AIDA_context). These variables remain available throughout the Graph and can be injected into any Format or AI Request block.

7.8 How do I generate an image with AI in my scenario?

Add an AI Request (Image) block and select a model (e.g., Flux Schnell 4B). Connect the Prompt (description of the desired image) and the Negative Prompt (prohibitions: blurry, low resolution, extra limbs...). The result image can be looped back into another AI Request Image block for modification (Image-to-Image).

7.9 How do I create an NPC whose behavior is analyzed by AI?

After a dialogue Repeat block, add a final AI Request that analyzes the conversation history and returns a unique keyword (e.g., SWORD or BOOT depending on the behavior). Use a Switch block to orient the flow towards different rewards or consequences.

💻 8. Vibe Coding & HTML5 Blocks

8.1 What is Vibe Coding in Celestory?

Vibe Coding consists of generating and integrating code (HTML/CSS/JS) through conversational iterations with an AI, without mastering web development. You provide a prompt to the AI, which generates the code, which you paste into a Celestory HTML5 block. You adjust through successive exchanges until the desired result is achieved.

8.2 How do I inject Celestory variables into an HTML5 block?

In the HTML code, use the double curly braces syntax: {{variable_name}}. Celestory automatically replaces these tags with the actual values. For structured data, use JSON Inputs via the block's entry point.

8.3 How do I create an HTML5 interface from a screenshot of an existing site?

Capture the inspiration site, submit the image to a multimodal AI (Claude, Gemini Vision) or a specialized tool (Google Stitch), request the generation of the corresponding HTML/CSS code, then paste this code into a Celestory HTML5 block. Then use Vibe Coding to make it dynamic (inject variables).

8.4 How do I generate a dynamic random quiz in my module?

Store the questions in a database (Airtable), retrieve the data via an Airtable block, format in JSON via a Format Text block, inject this JSON into an HTML5 block that handles the interactive display of the quiz. Scores are returned as output and can update the database.

8.5 What is a Switch block and what is it for?

The Switch block allows routing the flow to an indefinite number of different outputs (unlike the Condition which only handles True/False). It is ideal for analyzing the textual response of an AI (e.g., several possible keywords) and triggering the corresponding action.

🧠 9. AI & Advanced Concepts

9.1 What is a context window and why is it important?

It is the maximum amount of text (in tokens ≈ 0.75 words) that an AI model can process simultaneously. In case of saturation, the model "forgets" the initial instructions and may hallucinate. To remedy this: fragment complex tasks into sub-steps, avoid sending long useless histories, and store knowledge in a database rather than in context.

9.2 What is an AI hallucination and how do I avoid it?

A hallucination occurs when the AI invents information due to insufficient context or context window saturation. Solutions: use low temperatures, rigorously structure your data, fragment complex requests, and validate outputs before using them.

9.3 What is Few-Shot Prompting and what is it for?

Few-Shot Prompting consists of giving the AI 2 or 3 examples of your writing style or way of working so that it adopts your stylistic patterns. Result: less generic content and closer to your voice.

9.4 What is the difference between using AI via a chat interface and via API?

The Chat interface (e.g., ChatGPT) is a consumer product with native conversation history management, but data transits through the providers' servers. The API gives access to the raw power of the model, bills per request, and gives the creator (via Celestory) full control over the history and system prompt — ideal for custom business applications.

9.5 Does artificial intelligence store the confidential data of my clients/learners?

This depends on the AI engine (LLM) invoked. Some software has the right to study your content to optimize their models. However, via API requests (especially with European companies like Mistral AI and their Zero Data Retention standard), the machine simply calculates your response and then deletes all memory — categorically preventing any data leak. This is ideal for legal, medical, or corporate training environments.

9.6 Who owns the works generated by artificial intelligence in my modules?

A visual, audio or element generated 100% by AI does not possess exclusive authorship (an AI has no legal personality). However, the logical structure, the educational methodology, and the line of your exclusive prompts created in your Graph or Master Prompt constitute your exclusive Intellectual Property.

Updated on: 04/03/2026