With Famous.ai, creating an app that generates AI images is incredibly simple. You don't need to know how to code complex API integrations; you just need to tell the AI exactly what kind of image generator you want to build.
Here is how to build, customize, and choose the perfect engine for your own AI image generator.
1. Choose Your Use Case and Initial Prompt
Instead of just asking for a "generic image generator," the best Famous.ai apps are built for a specific purpose. Decide what you want your users to create, and use a detailed prompt to generate the app interface.
Here are four powerful use cases and the exact prompts to build them:
The Cinematic Image Generator Prompt:
"Create a Cinematic Image Generator. Users should type a core concept (like 'a futuristic city'). Add dropdowns for 'Camera Angle' (e.g., wide shot, drone view, macro) and 'Lighting' (e.g., neon, golden hour, cinematic dark). Wire it to generate an ultra-realistic, cinematic 16:9 image and include a 'Download High-Res' button."
The Avatar Creator Prompt:
"I want to build an AI Avatar Generator app. Create a clean, modern interface where users can upload a base photo or describe themselves, select an art style from a dropdown menu (e.g., Cyberpunk, Watercolor, 3D Render), and click a 'Generate Avatar' button. Include a loading animation while the image generates."
The Marketing Asset Builder Prompt:
"Build an AI Product Background Generator. The app should have a text input for the user to describe the scene (e.g., 'sitting on a marble counter with natural sunlight'), a button to generate the image, and a display area to show the final result. Make the design feel professional and minimal."
The Interior Design Visualizer Prompt:
"Create an Interior Design concept generator. Users should be able to type a room type (like 'living room') and a design style (like 'mid-century modern') into separate input fields. Add a 'Visualize Room' button that generates a high-quality AI image based on their inputs."
2. Select Your Image Generation Model (And Which to Choose)
Famous.ai gives you complete control over which AI model powers your app. Different models have different price points and specialties. You can tell the Famous.ai chat which model you want your app to use at any time.
Here are the models available and when you should use them:
GPT-5 Image Mini ($0.0096 per image)
The Difference: The most cost-effective, high-speed option.
When to use it: Best for apps with high user volume, rapid prototyping, or simpler image generations (like basic cartoons, icons, or flat illustrations) where extreme detail isn't required.
Gemini 2.5 Flash Image ($0.04 per image)
The Difference: Powered by Google's state-of-the-art visual architecture (also known as Nano Banana), this is the ultimate model for flexibility and multi-image workflows.
When to use it: Choose this if your app requires users to upload reference photos (multi-image fusion), needs to maintain character consistency across multiple generations, or relies on conversational editing (e.g., prompting the app to "remove the background" or "change the shirt color").
GPT-5 Image ($0.048 per image)
The Difference: The premium heavy-hitter for advanced, complex multimodal image creation.
When to use it: Best for high-end use cases where extreme photorealism, cinematic quality, and intricate adherence to long, complex text prompts are strictly required. (This is perfect for the Cinematic Image Generator use case!)
Prompt:
"Please wire up the generation button to use the GPT-5 Image Mini model to keep my generation costs low."
Prompt:
"I want this app to allow users to upload reference photos and edit them. Please use the Gemini 2.5 Flash Image model."
3. Add Cool Features (Storage, Galleries, and Uploads)
Because Famous.ai automatically manages your app's secure database, you do not need to manually configure external storage to save user creations. You can just ask the AI to build these features for you!
Once your basic generator is working, ask Famous.ai to add these advanced features:
Reference Uploads:
"Add an image upload button so the user can upload their own reference photo. Make the AI use that uploaded photo combined with the text prompt to generate the new image."
User Galleries:
"Add a 'Save to Gallery' feature and a 'My Creations' dashboard so users can see a gallery of all the images they have previously generated, with options to download or delete them."
Credit Systems:
"Add a credit system where users get 10 free generations when they sign up, and subtract 1 credit every time they click generate."
4. Test the App and Refine the Output
Once the app is built, switch to Preview mode.
Test the app by inputting a few different prompts to ensure the UI is correctly passing the user's text to the image model. If the generated images don't quite match the user's input, or if the layout feels clunky, return to the chat and use targeted instructions to fix it. For example:
"The generated image is displaying too small. Please make the image display area span the full width of the container. Keep everything else the same."
"When the user clicks generate, add a message that says 'Painting your masterpiece...' so they know the app is working while they wait."