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Apps built with Lovable, Bolt, Cursor or Replit can quietly break: sign-up does nothing, login fails or checkout errors, and you find out from your users.
From launch (by 30 November 2026), FlowCanary will test your app's sign-up, login and checkout in a real browser on a schedule, then send a plain-English alert plus a fix prompt for Lovable, Bolt, Cursor or Replit.
Try it today: the free checker at flowcanary.app/check needs no sign-up (3 checks a day). A real browser loads your page and reports the HTTP status, JavaScript errors, failed requests and blank pages, with a screenshot and a fix prompt.
Free plan: $0, 1 flow checked daily. Founding plans: Starter $15/month, Pro $39/month. The plan starts at launch, with a full refund if FlowCanary doesn't launch by 30 November 2026.