Build apps by describing them
Today we're launching AI Agent Mode — a new way to build on Spinini. Instead of writing every line yourself, you describe what you want and watch the agent build it in real time.
How it works
The AI Agent in Spinini is powered by frontier AI models. When you type a prompt, it:
1. Plans — decides which files to create, what packages to install, how to structure the code
2. Builds — writes files one by one, directly into your project
3. Runs — installs dependencies, starts your app
4. Fixes — reads terminal output, catches errors, and corrects them automatically
You see every step as it happens. Files appear in the file tree the moment they're written. The preview updates automatically.
What it can build
In our testing, the agent successfully builds:
- REST APIs with Express, Fastify, Flask
- React and Next.js apps with full CRUD
- Python scripts and data pipelines
- Full-stack apps with database integration
- CLI tools, automation scripts, webhook handlers
The right model for the job
You choose the AI model:
- Haiku — fastest and cheapest, great for simple changes and quick fixes
- Sonnet — the recommended balance of speed and capability
- Opus — the most capable, best for complex multi-file apps
Plan mode
For bigger tasks, enable Plan mode. The agent states its approach before writing any code — you can redirect it or approve the plan before it starts.
Credits
Each agent task uses credits based on how many tokens the AI processes. A simple task (add a button, fix a bug) uses ~10–30 credits. A full app from scratch might use 100–300 credits. Free accounts get 100 credits per month; paid plans get much more.
Try it now
Open any project, click AI Agent in the sidebar, and type what you want to build. The agent is waiting.