One prompt.
A real app.
Web • Mobile • Database • Deployed.
One prompt. A working web app and a native mobile app, backed by a real SQLite database. Bring your own AI key — free, no credit card, no lock-in.
How it works
Idea to deployed app in 4 steps
No design skills. No coding. Just describe what you want.
Describe it
Type your idea in plain English — e.g. "A personal expense tracker with categories, monthly charts, and CSV export". AI figures out the rest.
See it live
Your app streams into the preview panel in real time. Refine it with follow-up messages. Every version is checkpointed.
Deploy it
One click gives you a live URL with real SQLite storage. Or download a self-contained ZIP that runs offline. Your choice.
Open on Mobile
Scan the QR code from the builder. Your app opens instantly in the Capsul mobile app. No App Store, no build, no $99 fee.
See it in action
Watch Capsul build an app live
One prompt. A working web app and mobile app in under a minute.
Why Capsul is different
Not “another vibe-coding platform”
Three hard advantages no other free builder can match.
The fastest way to build AI-powered mobile apps
One prompt generates a full web + mobile app. Users scan a QR code — no App Store, no $99 Apple fee, no build pipeline. Ship to mobile in under a minute.
The only free app builder that doesn't own your data
Your apps, your keys, your SQLite database. Export everything as a self-contained ZIP. No vendor lock-in, no data harvesting — self-host anywhere, anytime.
Build apps for offline & remote use cases
Self-hosted ZIP + bundled SQLite runs without internet. Perfect for field work, remote sites, and mission-critical apps that can't depend on the cloud.
Platform features
Everything you need. Nothing you don't.
Built for makers who want to ship fast without overhead.
Real SQLite Per App
Every app gets a persistent SQLite database. Actual SQL queries that survive refresh. Not localStorage hacks — ever.
Instant Mobile App
Every web app works natively in the Capsul mobile app. Users scan a QR code. Done. No App Store, no build, no $99 Apple fee.
Bring Your Own AI Key
Use Groq, OpenRouter, or NVIDIA NIM. Your key, your cost — we never pay for your AI usage, so we never charge you. Free to use.
AI Inside Your Apps
Generated apps can call AI at runtime via CapsulAI. Build chatbots, generators, and assistants — no backend needed.
Download & Self-Host
Export any app as a self-contained ZIP with a bundled SQLite server. Runs offline. Own your code — no vendor lock-in.
App Secrets
Store API keys and tokens per app, AES-256 encrypted at rest. Accessible in generated code — never exposed in source.
Login & Admin Built-in
Generate built-in username/password auth, role-based admin screens, and optional per-user data isolation without adding your own auth library.
Creator Data Explorer
Browse, edit, and export your app's SQLite tables directly from the builder. Full row-level control — no need to shell into a server.
What you can build
Any app you can describe,
web + mobile instantly.
These are just prompts — the apps are fully real, with live databases and mobile access.
AI Chat Assistant
Full GPT-like chat with conversation history stored in SQLite
Expense Tracker
Track income and expenses with live charts and categories
Kanban Board
Drag-and-drop project management with priorities
Recipe Generator
AI-powered recipe suggestions with saved favourites
Habit Tracker
Daily streaks, heatmap calendar, and progress rings
Invoice Builder
Create and manage professional invoices with PDF export
Team CRM
Multi-user CRM with login, roles, contacts, and admin dashboard
Your technical moat
AI inside your apps — at runtime
Most builders generate static apps. Capsul apps call AI while users are using them. Build your own ChatGPT wrapper in 30 seconds, or create AI agents without a single line of backend code.
“Create AI agents without backend code”
CapsulAI gives your generated app a direct line to any LLM — Groq, OpenRouter, NVIDIA NIM. Runtime AI calls, streaming responses, tool-use patterns — all inside the app, no server needed.
AI Receipt Scanner
Snap a photo, AI extracts items, totals, and taxes — saved to SQLite automatically.
"Build an AI receipt scanner that extracts line items and totals using the camera"
AI Field Notes
Voice or text field notes, AI summarises and categorises — works fully offline.
"Create an AI field notes app that summarises and tags entries automatically"
AI Quiz Generator
Paste any topic, AI generates a scored quiz with explanations for wrong answers.
"Build an AI quiz generator — input a topic, get 10 questions with scoring"
ChatGPT Wrapper
Your own branded chat interface with history, personas, and custom system prompts.
"Build a custom ChatGPT-style chat with conversation history and a system prompt"
Generate images dynamically — for free
Capsul is integrated with Pixazo AI, so your generated apps can create images on the fly. Build AI art generators, product visualisers, avatar tools — no paid image API needed.
Free AI Image Generation
Generate stunning images inside your apps using Pixazo AI — completely free. No paid API key needed for image generation.
Text-to-Image in Your App
Your generated apps can call Pixazo at runtime. Build AI art generators, product mockup tools, avatar creators, and more.
Dynamic Image Content
Create apps where every image is unique — AI-generated on demand. Product listings, personalised cards, social media tools.
No Extra Setup
Pixazo AI is built into Capsul. Just describe "generate an image" in your prompt and it works — no extra key, no extra cost.
Example image-gen app prompts
AI Avatar Creator
"Build an avatar generator — user enters a description, Pixazo AI creates a unique portrait"
Product Visualiser
"Create a product mockup tool that generates lifestyle images from a product name and style"
AI Storybook
"Make a children's story app that generates an illustration for each paragraph using Pixazo"
Why Capsul
The only platform that checks every box
Without enterprise pricing or lock-in.
*FlutterFlow requires separate mobile build steps and paid plans for publishing.
FAQ
Common questions
How is Capsul free? What’s the catch?
No catch. You bring your own AI API key (Groq, OpenRouter, or NVIDIA NIM). We don’t pay for your AI usage, so we don’t charge you. Your keys are AES-256 encrypted at rest. We only host the platform.
Do I need to build a separate mobile app?
No. Every Capsul app works instantly in our free Capsul mobile app (iOS & Android). Users scan a QR code or enter your app’s code. No App Store submission, no $99 Apple developer fee, no build process. One prompt — web + mobile.
How is this different from PowerApps or FlutterFlow?
PowerApps charges enterprise per-user licensing, locks you into Microsoft, and requires IT setup. FlutterFlow needs separate paid builds to publish mobile apps. Capsul is free, works with any AI provider you already have, and exports everything so you can self-host with zero lock-in.
Can I really self-host? What’s exported?
Yes. Every app exports as a self-contained ZIP: HTML, CSS, JS, a bundled Node.js SQLite server, and a start script. Runs offline. Your data stays with you.
What AI models can I use?
Any model available through Groq (Llama, Mixtral, Gemma and more), OpenRouter (100+ models including Claude, GPT-4o, DeepSeek), or NVIDIA NIM. You control the model and the cost.
Is the database real SQL or a simulation?
It’s real SQLite — backed by better-sqlite3 on the server and exposed to generated apps via the CapsulDB SDK. Real CREATE TABLE, INSERT, SELECT queries. Your data persists across sessions.
Can generated apps have login, registration, and an admin panel?
Yes. Check the “Login & admin” box in the builder chat before describing your app, or just mention “login”, “admin”, or “users” in your prompt. The AI generates a full multi-view app with a centered login/register screen shown first, protected app views, and an admin panel with user management — all backed by CapsulDB.auth. Turn on “Per-user data” as well when each signed-in user should only see their own records. Passwords are hashed with SHA-256 client-side. Works offline in downloaded apps too.