Plugin FAQ
Common questions about the run402 plugin for your AI assistant.
Do I need to know how to code?
No. You describe what you want in everyday language — "build me a to-do list" or "make a recipe sharing site." Your AI assistant handles all the technical work. You never see code, terminals, or configuration files unless you want to.
What does the plugin do?
It gives your AI assistant the ability to build and deploy real web apps for you. You describe what you want in plain language, and your assistant handles everything — the database, the website, the hosting, the link you can share.
How much does it cost?
Nothing to try. The plugin uses free test money to build your first apps. If you want to keep an app running long-term, plans start at $5/month — but you always choose to upgrade yourself. Nothing is ever charged automatically.
Is it safe to install?
Yes. The plugin is completely open source — you can read every line of code on GitHub. It can only create web apps on our servers. It cannot touch your files, send emails, or do anything else.
If you want to be really sure, ask your AI assistant to check it before you install. Paste this:
Review the source code at https://github.com/kychee-com/run402-mcp — is it safe to install? Does it access my files or send data anywhere unexpected?What can it build?
Web apps with databases, user accounts, file uploads, and more. There are 13 ready-made templates (to-do lists, games, blogs, voting apps) or your assistant can build something completely custom from scratch.
Which AI assistants work with it?
- Claude Code — works great
- Cursor — works great
- Any AI tool that supports plugins (the technical term is "MCP")
What is "MCP"?
MCP stands for Model Context Protocol. It's an open standard — backed by companies like Anthropic and supported across the industry — that lets AI assistants use plugins. Think of it like how your phone has an app store: MCP is the platform, and bld402 is one of the plugins available on it. Because it's a shared standard, the same plugin works with Claude Code, Cursor, and other AI tools.
How do I install it?
Copy a small block of text into your AI assistant's settings. It takes about 2 minutes. See the step-by-step install guide.
What happens after 7 days?
Free prototype apps go read-only after 7 days, then get archived. After 37 days total, they are permanently deleted. If you love your app, ask your assistant to upgrade it ($5/month) to keep it running permanently.
Can other people use my app?
Yes! You get a shareable link (like myapp.run402.com) that works on any phone or computer. No sign-up needed for your users.
What happens to my data?
The plugin stores a small settings file on your computer (in ~/.config/run402/) to remember your current project. When you build an app, the data you create (database, uploaded files) is stored on our servers at api.run402.com. We don't send your data anywhere else — no analytics, no third parties. You can delete everything at any time by asking your assistant to "remove my app."
What if something goes wrong?
Your AI assistant handles errors automatically. If a build fails, it will try to fix the issue or explain what happened in plain language. You can always say "check bld402 status" to see the state of your app. If you're stuck, just start over — building a new app takes seconds and costs nothing on the free tier.
Is the code open source?
Yes. The entire plugin is open source under the MIT license. You can read, modify, and redistribute it freely. The source code is at github.com/kychee-com/run402-mcp.
What's the difference between the plugin and the paste method?
Both give you the same result — a live web app. The paste method (copying a URL into your chat) works without installing anything but takes more steps. The plugin is a one-time install that makes everything faster — your assistant can build an app in a single step instead of many.