2 Java templates
Build Java apps with AI
A Spring Boot service from start.spring.io with the Maven wrapper included, running live in a cloud sandbox. Describe the API and the builder writes the controllers, services and tests.
The Java templates
Start opens the New Web App dialog with the template picked — you set the stack, design, model and MCP tools there.
- Spring Boot
A Spring Boot web service from start.spring.io, with the Maven wrapper included.
- Spring Boot AI SaaSAI SaaS
An AI SaaS dashboard: landing, Supabase sign-in, AI chat with history, MCP tools and knowledge search.
Every Java project gets
- A cloud sandbox with a live preview of the running app
- A real terminal with 15 coding CLIs — Claude Code, Codex, Cursor CLI, Gemini CLI and more
- AI on your own keys from 24 providers, billed by the provider at cost
- Its own GitHub repository from the first push
Where it can go
Vercel has no Java runtime, so Spring Boot is not deployed there. Push to your GitHub repository and deploy as a container or to any JVM host.
Questions
Can I build a Java app with AI?
Yes. Pick one of 2 Java templates — Spring Boot — and describe what you want. The builder writes the code in a cloud sandbox with a live preview and a real terminal, using your own AI provider key.
Where can I deploy a Java app built here?
Vercel has no Java runtime, so Spring Boot is not deployed there. Push to your GitHub repository and deploy as a container or to any JVM host.
What happens when I press Start?
You sign up — or, if you are already signed in, go straight on — and the New Web App dialog opens with that template picked. Set the name, stack, design, model and MCP tools there, then press Create.
Do I own the code?
Yes. The project is pushed to your own GitHub repository, and you can open a terminal on it at any point.
Start your Java app
7 days free, no card. Plans from $8 a month for the sandbox — AI is billed by your provider, at cost.
Pick a template