A beginner‑friendly guide to creating a multi‑purpose AI web app with 10 creative tools: hairstyle, outfit, food, packaging, comics, and more, powered by Google Gemini.
Hi everyone, welcome back to Tamilan AI! 👋
In this post, we're diving into a powerful, multi‑purpose AI web application built with Google Gemini's multimodal capabilities, designed to solve 10 real‑world image generation and enhancement use cases in a single, unified interface.
Instead of juggling multiple tools, this Vite/React‑based app integrates Gemini's vision and generative AI into one streamlined workflow, turning everyday photos into creative assets in seconds. We'll explore how to build and use 10 practical AI‑powered features:
- 💇 Hairstyle Changer - Generate 9 different hairstyle variations from a single portrait using prompt‑driven image editing.
- 👔 OOTD Generator - Create realistic "Outfit of the Day" images by combining a person with fashion items via image‑to‑image generation.
- 👗 Clothing Changer - Swap outfits on a person in an image using inpainting and style transfer techniques.
- 💥 Explosive Food Photography - Transform static food photos into dynamic, high‑impact scenes with dramatic effects.
- 🎨 Fashion Moodboard - Generate annotated fashion moodboards from reference images for styling and design.
- 📦 Product Packaging - Apply custom designs to 3D product mockups using generative AI and image compositing.
- 🍔 Calorie Annotator - Analyze food images and overlay nutritional information using vision‑based classification and text generation.
- 📸 ID Photo Creator - Convert casual portraits into professional ID photos with background replacement and standardization.
- 📚 Comic Book Creator - Transform real images into stylized comic strip panels using artistic filters and panel layout generation.
- 🎬 Movie Storyboard - Generate a 12‑part film noir‑style storyboard from a single scene description or image.
Whether you're a developer, designer, or content creator, this app demonstrates how Gemini's multimodal API can be used to build a production‑ready, multi‑tool AI platform that's both fun and practical for daily creative tasks.
Let's get started! 🚀
How I Built the App (Tech Stack & Architecture)
To bring this multi‑purpose AI concept to life, I built a clean, modern frontend using Vite + React - a perfect stack for rapid prototyping, fast hot‑module replacement (HMR), and excellent TypeScript support. This gave me a lightweight, production‑ready foundation with minimal configuration overhead, ideal for a feature‑rich AI web app.
The core intelligence is powered by Google Gemini's multimodal LLM API, specifically the gemini-2.5-flash-image-preview model. This model is optimized for low‑latency, high‑throughput image‑aware generation, making it ideal for real‑time, interactive use cases like hairstyle changes, outfit generation, and food photography effects.
I integrated the Gemini API using plain JavaScript/TypeScript fetch calls (no heavy SDKs), sending structured requests that include:
- A base64‑encoded image (or image URL),
- A text prompt describing the desired transformation,
- Model parameters like max_tokens, temperature, and top_p for consistent, controllable outputs.
All 10 features in this app are driven by prompt engineering - the real "secret sauce" behind the scenes. Each functionality (hairstyle changer, OOTD generator, explosive food photography, fashion moodboard, etc.) uses a carefully crafted prompt template that combines:
- A clear role definition (e.g., "You are a creative AI stylist…"),
- Input constraints (image + optional text),
- Output format instructions (JSON, markdown, or image generation directives),
- Style, quality, and safety guidance (resolution, aspect ratio, artistic style, and content policies).
These prompts act as the "brain" of the app, turning a single gemini-2.5-flash-image-preview endpoint into 10 distinct AI tools. By abstracting the prompt logic into reusable, composable functions, I kept the codebase modular, maintainable, and easy to extend with new features.
The entire project is open‑sourced on GitHub:
👉 Tamilan-AI / Gemini‑Multi‑Purpose‑App
And for a hands‑on experience, I've deployed a live demo where you can try all 10 features without needing an API key:
👉 Gemini Multi‑Purpose App Demo
This setup shows how a simple Vite/React frontend, combined with a powerful multimodal LLM like gemini-2.5-flash-image-preview and smart prompt engineering, can create a full‑featured, multi‑tool AI application that's both fun and practical for real‑world creative tasks.
💇 Hairstyle Changer
What it does:
Generate 9 different hairstyle variations (short, long, curly, straight, braids, etc.) from a single portrait photo using AI.
How to choose the image:
- Use a clear, well-lit portrait photo
- Ensure the person's face and hair are clearly visible
- Avoid images with hats or hair accessories
- Higher resolution images produce better results
- The person should be facing forward or at a slight angle
How it helps in real life:
Perfect for trying out new hairstyles before cutting or coloring, fashion shoots, character design, or social media content where you want to show multiple looks from one photo.
👔 OOTD Generator (Outfit of the Day)
What it does:
Combine a person's portrait with a clothing image (top, dress, suit, etc.) to generate a realistic "Outfit of the Day" photo.
How to choose the image:
- Use a clear, full-body or upper-body photo of a person
- Choose clothing images with good lighting and clear details
- Ensure both images are high resolution for better quality
- The person should be in a neutral pose for easier clothing integration
- Clothing items should be clearly visible and not too complex
- Avoid images with heavy shadows or poor lighting
How it helps in real life:
Great for fashion bloggers, influencers, and e‑commerce stores to create OOTD content without photoshoots, or for personal styling ideas.
👗 Clothing Changer
What it does:
Swap the clothing on a person in a photo with a new outfit using AI‑driven inpainting and style transfer.
How to choose the image:
- Use clear images with good lighting for both person and clothing
- The person should be in a neutral, visible pose
- Reference clothing should be clearly visible and well-defined
- Avoid complex backgrounds that might interfere with clothing detection
- Higher resolution images produce more realistic results
- Simple clothing changes work better than complex outfit transformations
How it helps in real life:
Useful for virtual try‑ons, fashion design, or quickly showing how a product looks on a model without reshoots.
💥 Explosive Food Photography
What it does:
Transform a normal food photo into a dramatic, high‑impact "explosion" scene (e.g., flying ingredients, splashes, smoke).
How to choose the image:
- Use high-quality food product images with clear details
- Choose brand colors that complement your food product
- Ensure the food product is well-lit and clearly visible
- Simple, clean product shots work better than complex compositions
- The food should be the main focus of the original image
- Higher resolution images produce more dramatic results
How it helps in real life:
Ideal for food bloggers, restaurants, and social media to create eye‑catching, viral‑style food content that stands out.
🎨 Fashion Moodboard
What it does:
Generate an annotated fashion moodboard from a reference image (e.g., a photo, sketch, or fabric swatch).
How to choose the image:
- Use high-quality fashion images with clear details and good lighting
- Images with multiple fashion items work great for diverse cutouts
- Fashion photography, runway shots, and styled outfits work best
- Ensure the fashion elements are clearly visible and well-defined
- Higher resolution images produce more detailed moodboard elements
Images with interesting textures and patterns add visual appeal
How it helps in real life:
Perfect for designers, stylists, and content creators to quickly build moodboards for collections, shoots, or client presentations.
📦 Product Packaging
What it does:
Apply your design (logo, label, artwork) to a 3D product packaging mockup (bottle, box, can, etc.).
How to choose the images:
- Use high-quality product design images with clear details
- Choose packaging references that match your product type
- Ensure both images have good lighting and contrast
- Vector-based designs often produce cleaner results
- Consider the packaging material and surface when selecting references
How it helps in real life:
Great for startups, brands, and designers to visualize packaging before printing, or for pitching ideas to clients.
🍔 Calorie Annotator
What it does:
Analyze a food image and overlay estimated calorie count and nutritional information (carbs, protein, fat) on the photo.
How to choose the image:
- Use clear, well-lit images of food items
- Ensure individual food items are clearly visible and separated
- Include the entire meal or dish in the frame
- Avoid images with heavy shadows or poor lighting
- For packaged foods, include visible labels when possible
- Multiple angles of complex dishes can improve accuracy
How it helps in real life:
Useful for fitness coaches, nutritionists, and health apps to create educational content or help users track meals visually.
📸 ID Photo Creator
What it does:
Convert a casual portrait into a professional ID photo with a clean background, proper lighting, and standard dimensions.
How to choose the image:
- Use a clear, high-resolution portrait photo
- Ensure the person is facing forward with eyes open
- Good lighting on the face is essential
- Avoid shadows, reflections, or busy backgrounds
- The person should have a neutral or slight smile
- Remove hats, sunglasses, or other face coverings
How it helps in real life:
Perfect for job applications, passports, visas, or any official document where you need a clean, standardized ID photo without visiting a studio.
📚 Comic Book Creator
What it does:
Transform a real photo into a stylized comic strip panel with speech bubbles, captions, and comic‑book effects.
How to choose the image:
- Use clear images with good contrast and lighting
- Character images work best for superhero transformations
- Action poses or dynamic scenes create more exciting comics
- Higher resolution images produce better comic details
- Consider the mood and energy you want in your comic
- Images with interesting backgrounds add story context
How it helps in real life:
Great for content creators, educators, and storytellers to make engaging comic‑style posts, stories, or educational material.
🎬 Movie Storyboard
What it does:
Generate a 12‑part film noir‑style storyboard from a single scene description or image.
How to choose the image / input:
- Use clear, well-lit reference images for character creation
- Portrait or character images work best for protagonist development
- Images with interesting facial features create more compelling detectives
- Higher resolution images produce better storyboard details
- Consider the mood and personality you want for your detective character
- Action poses or dramatic expressions enhance the noir atmosphere
How it helps in real life:
Ideal for filmmakers, animators, and content creators to quickly visualize scenes, plan shots, or pitch ideas without drawing every frame by hand.
🎯 Conclusion
This Gemini Multi‑Purpose App shows how a single multimodal LLM like gemini-2.5-flash-image-preview, combined with smart prompt engineering and a clean Vite/React frontend, can power 10 practical, creative AI tools in one place.
The entire project is open‑source and available on GitHub - feel free to clone it, customize the prompts, add new features, and use it in your own projects:
👉 Tamilan-AI / Gemini‑Multi‑Purpose‑App
If you just want to try it out without any setup, you can play with the live demo where all 10 features are available for free, no API key needed:
👉 Gemini Multi‑Purpose App Demo
If you have any questions, ideas, or want to collaborate on new AI tools, don't hesitate to reach out - I'd love to hear from you and help you build your own AI superpowers! 💡
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