AI Software Engineer
Willow, the AI software engineer that takes your app from idea to running
Willow is an AI software engineer. You describe the app you want, and Willow designs the structure, writes the frontend and backend code, sets up the database, runs the app, and fixes its own errors until you can try it in a live preview.
What is an AI software engineer?
An AI software engineer is an AI agent that does an engineer's whole job, not just autocomplete. It reads the requirements, breaks them into tasks, writes and edits many files, runs commands, reads the errors, and fixes them until the result works.
The difference from a regular chatbot: a chatbot hands you code snippets that you copy, assemble, and run yourself. An AI software engineer like Willow works directly in the project workspace, so what you end up with is a live app, not text in a chat window.
Willow works like a senior software engineer
Every Willow workspace has its own filesystem and development server. Willow's agent uses that access to work like a careful senior engineer:
- Designs the app architecture: pages, APIs, and a PostgreSQL database schema.
- Writes full-stack React and Hono code that people can read and extend.
- Runs the app, reads the server errors, and fixes them on its own.
- Adds authentication, input validation, and database migrations step by step.
- Takes revisions through chat, like a code review with a teammate.
- Hands over the full source code to download, with no vendor lock-in.
AI native: built to work with AI from day one
Willow does not bolt AI features onto an old editor. The whole workflow is AI native: the prompt is the main interface, the agent is in charge of files and commands, and you just steer the result. That is why people with no coding background can build apps that usually take a team of engineers.
Who is Willow for?
Students use Willow for coursework and final-year projects, founders for MVPs, business owners for internal tools, and developers to speed through the tedious parts of a project.
- Students: information systems, capstone projects, and portfolios.
- Founders and startups: an MVP to validate an idea in hours.
- Small businesses: point-of-sale, catalog, booking, and internal dashboard apps.
- Developers: scaffold a full-stack project, then keep going in your favorite editor.
Frequently asked questions
Is Willow really an AI software engineer?
Yes. Willow does more than suggest code. Its agent writes and edits the project files, runs the app, reads the errors, and fixes them until the app works in the live preview.
Do I need to know how to code to use Willow?
No. Just describe the app you want in plain language. If you do code, you can still read, edit, and download all of the source code.
What technology do Willow apps use?
Apps are built with React on the frontend, Hono on the backend, and PostgreSQL as the database. It is a modern stack that professional engineers use every day.
How is Willow different from ChatGPT, Claude, or Gemini?
ChatGPT, Claude, and Gemini are general AI assistants that give answers and code snippets. Willow is an AI software engineer that builds, runs, and fixes a complete app for you in its own workspace, with a live preview.
How much does Willow cost?
You can start free. The Pro plan starts at $8, and downloading the full source code starts at $1.
Start building your app today
Describe your app idea in plain language. Willow builds the frontend, backend, and database, then gives you a live preview you can try right away.
Start free