Guide · Replit
Fix a broken Replit app
Updated
Short answer
A Replit app that works in Preview can still fail at its public address. Replit's own troubleshooting starts with the same question: does it work in Preview, and if so, what is different in production? Check the production Secrets, the deployment type and the logs. 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 Replit. The name is used only to say which tool this is about.
How a Replit app breaks once real users arrive
Replit says publishing "saves a snapshot of your Replit App to the cloud", "separate from the version in the Project Editor", and that every Replit App works with a development database and a production database. Many launch problems can come from that gap.
- Works in the workspace, not published. Replit says "Secrets you set in the Project Editor do not automatically carry over to your published app." Missing Secrets can cause "login errors, or payment failures." See Replit: app works in preview but not when published and Works in the preview but not after publishing.
- The published address does not load the app. Replit lists causes such as a server that listens only on localhost, and a homepage that takes more than five seconds to respond. See Replit: your published app address does not load your app.
- Blank page or a button that does nothing after publish. See Blank page after publish and A button on my app does nothing after I published it.
- Sign-up and login problems. Replit's list of things to compare between Preview and production includes "Login callback or redirect URLs." See Login broken after publishing and Sign-up loops back to the login page.
- Data not saving or disappearing. Replit warns that "The file system in published apps is not persistent and resets every time you publish", and says to use a database. It also says every Replit App works with two databases, a development database and a production database. We have no separate VibeFix guide on this one.
- Payments. Replit's list includes "Payment webhook or redirect settings." See Customers can't pay and Stripe checkout not working on the live site.
What you can try yourself first
- Check Preview first. Replit says "If Preview is broken, publishing will not fix it."
- Open the Logs tab in the Publishing pane and look for missing packages, environment variables or startup errors.
- Add your production Secrets in the Publishing pane.
- Check the deployment type. Replit says apps with server-side behavior may not suit Static Deployments and should use Autoscale.
- Ask Replit Agent to compare Preview and production. Replit's Troubleshoot publishing page gives a prompt for this.
- Test as a stranger: a private window and a new email address.
How VibeFix helps
VibeFix is independent of any app builder. Our AI agent can fix a Replit app in its code when the code is on GitHub. Replit says its version control gives you "built-in Git integration and GitHub connectivity."
- 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.
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.