Know your AI-built app broke
before your users do.
FlowCanary runs your key user flows (sign up, log in, checkout) in a real browser, in plain English, and tells you the moment one breaks, with a fix prompt you can paste straight into your AI tool.
Is my app broken? Check free Join the waitlistThe problem
AI tools make shipping fast. They also make breaking things silent.
One prompt fixes a bug, breaks sign-up
An AI edit to one page quietly changes another. You don't notice until a user emails, or doesn't.
"Up" isn't the same as "working"
Uptime monitors say 200 OK while your page renders blank, the button does nothing or the Supabase key expired.
Testing tools aren't built for you
Playwright scripts and QA suites assume you're an engineer. You just want to know: does my app still work?
How it works
Three steps, no code.
Describe the flow
“Sign up with a test email, then see the dashboard.” Plain English, like you'd tell a friend.
We run it in a real browser
On a schedule (hourly or every 30 minutes), FlowCanary clicks through your app like a user, capturing errors, failed requests and screenshots.
Get alerted, with the fix
When a step fails you get an email with what broke, a screenshot and a ready-to-paste prompt for Cursor, Lovable or Bolt.
Try it now: is my app broken?
Free, no sign-up. We'll load your app once and tell you what we see.
Simple pricing
Join early to lock in founding-member pricing.
StarterMost popular
- 3 flows, checked hourly
- Uptime + SSL checks
- Email & Slack alerts
- Copy-paste fix prompts
Pro
- 10 flows, every 30 minutes
- Logged-in flows (test accounts)
- Email, Slack & webhook alerts
- 30-day history
FAQ
What does the free checker actually do?
It opens your URL once in a real headless Chrome browser (like a visitor would), waits for it to load, and reports the HTTP status, uncaught JavaScript errors, console errors, failed network requests (scripts, APIs, images) and whether the page rendered blank. You get a screenshot and a copy-paste prompt you can give your AI coding tool to fix what it found.
Can it test a whole flow like sign-up or checkout?
The free checker can try one short step, like clicking a button and checking some text appears. Typing into forms needs you to tick 'I own this site'. The paid plans (coming soon) re-run full multi-step flows on a schedule and alert you when one breaks.
Who is FlowCanary for?
People who build and ship apps with AI tools such as Lovable, Bolt, Cursor, Replit, v0 or Claude Code, and who find out something broke only when a user complains. No testing knowledge needed: you describe flows in plain English.
How is this different from an uptime monitor?
Uptime monitors check that your server answers. Your server can answer perfectly while the page is blank, the sign-up button does nothing or the Stripe call fails. FlowCanary uses a real browser to check the things users actually do.