Guide · Cursor
Fix a broken Cursor-built app
Updated
Short answer
Cursor writes code in your own project, so an app built with it can use any stack and any host. That means the launch problems depend on what the app is built on, not on Cursor itself. Work out where the app is hosted and what runs its login and database, check those settings, and test the live address in a private window. If it is still broken, a free VibeFix check tries the problem on your live app, and the fix in the code is $79, paid up front.
This page is about apps built with Cursor. The name is used only to say which tool this is about.
How a Cursor-built app breaks once real users arrive
Cursor's docs describe it as a tool to "understand your codebase, plan and build features, fix bugs, review changes." Pick the problems below that match your stack and host.
- Works on your computer, not live. Settings and environment variables on your machine are not on the host. See Works in the preview but not after publishing and Blank page after publish.
- Sign-up and login loops. The address your auth provider sends people back to may still be a local one. See Sign-up loops back to the login page and Login broken after publishing.
- Emails not arriving. If the app uses Supabase, see Confirmation emails not arriving.
- Data not saving because of database rules. If the app uses Supabase, see Data won't save (row-level security).
- 404 after deployment. If the app is on Vercel, see 404 on Vercel right after deployment.
- Payments. See Customers can't pay and Stripe checkout not working on the live site.
What you can try yourself first
- Use Debug Mode in Cursor for a bug you can reproduce. Cursor's Debug Mode docs say the agent "uses runtime information to pinpoint the exact issue" instead of guessing.
- Restore a checkpoint if an Agent change made things worse. Cursor says "Checkpoints save snapshots of your codebase during an Agent session", and that they are "stored locally and separate from Git." Use Git for anything you want to keep (Agent overview).
- Review before you merge. Cursor's Agent Review "runs a dedicated code review on your local changes from inside Cursor."
- Read your host's logs and compare the live settings with your local ones.
- Test as a stranger: a private window, a new email address, the live address.
How VibeFix helps
VibeFix is independent of any app builder. A Cursor project is already code, so if it is on GitHub, our AI agent can fix it there. There is also a guide to adding VibeFix to Cursor in 1 minute.
- Free check. "You tell us what broke. Our AI agent tries it on your live app, says whether it hit the same problem, and sends a screenshot."
- Fix. "Our AI agent finds the cause and fixes it in your code." The price is "$79, paid up front."
- Delivery and re-check. "A GitHub pull request in your own repository." After the fix is live, the AI agent goes back to your live app and repeats the check that failed, the way a customer would.
- Refund. "If we can't complete your re-check, you get your money back."
- Which apps. "Today the fix is for apps built with Lovable, or any app whose code is on GitHub."
- Never asked. "We never ask for passwords."
A check reports what the AI agent saw. It does not promise that every problem is found.
Want it fixed?
Our AI agent fixes it in your code and tests your live app again. See pricing.
It starts with a free check that confirms the problem on your live app, no account needed.
VibeFix is independent. Lovable, Bolt, Replit, Base44, v0, Supabase, Firebase, Stripe, Vercel and Google are trademarks of their owners. Cursor is a trademark of its owner.
Want it fixed?
Our AI agent fixes it in your code and tests your live app again. See pricing.
It starts with a free check that confirms the problem on your live app, no account needed.