"Project not found", "Website Not Found - Bolt", "This app isn't live yet": when your AI-built app disappears
Your builder is showing its own page instead of your app. Some of these pages answer with a normal 200 status, so ordinary uptime monitors report the app as up while visitors see an error.
What each page means
Lovable — "No Lovable project found at this address": nothing is published at that address (never published, unpublished, or an inactive Free project that was unpublished).
Lovable — a redirect to /blocked titled "Website Takedown Notice": Lovable's Trust & Safety team took the project down; the owner is emailed.
Bolt — "Website Not Found - Bolt": no site at that bolt.host address. This page answers with status 200.
Replit — "This app isn't live yet": no published app at that address right now (Replit routing faults have briefly shown it on live apps too).
Replit — "Run this app to see the results here." on a replit.dev address: that is a development address, which only works while someone has the app open in Replit. Publish the app and share the published address instead.
Base44 — a redirect to /login is not an outage: the app is set to private.
How to fix it
Check the project is still published in your builder, and that the address is the published one, not a preview link.
For a takedown, read the email from the platform and reply through its support.
Keep a copy of your code and data outside the platform, and consider a custom domain you own, so you can move hosts if you need to.
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Checked against these sources on 26 October 2026.