FlowCanary facts

A plain list of what FlowCanary is and does. If something here differs from another page, tell us.

What it is

  • Headline: "Built it with AI? We'll make sure it still works."
  • Scheduled testing is launching by 30 November 2026. Once it is live, FlowCanary will test the sign-up, login and checkout of AI-built apps in a real browser on a schedule, and give you a plain-English alert plus a fix prompt for Lovable, Bolt, Cursor or Replit.
  • It is for people who build and ship apps with AI tools. No testing knowledge is needed: you describe flows in plain English.
  • It is an early-stage product run from the United Kingdom by Paul Devlin.
  • Status: early access. The free checker works today. Scheduled monitoring launches by 30 November 2026.
  • Website: flowcanary.app. On X: @FlowCanaryHQ.

The free checker

  • At flowcanary.app/check. Free, no sign-up, 3 checks per day.
  • It opens your URL once in a real headless Chrome browser and reports the HTTP status, uncaught JavaScript errors, console errors, failed network requests and whether the page rendered blank, with a screenshot and a copy-paste fix prompt.
  • It can try one short step, like clicking a button and checking some text appears. It only types into forms if you tick "I own this site".
  • It only visits the public URL you give it and does not submit payments. It identifies itself as "FlowCanaryChecker" in its user agent.

Plans and prices (USD; UK VAT may apply)

  • Free: $0. 1 flow, checked daily; email alert when it breaks; screenshot and fix prompt.
  • Starter (founding plan): $15/month. 3 flows, checked hourly; uptime and SSL checks; email and Slack alerts; copy-paste fix prompts.
  • Pro (founding plan): $39/month. 10 flows, every 30 minutes; logged-in flows with test accounts; email, Slack and webhook alerts; 30-day history.
  • Founding members pay the first month up front, and the plan starts at launch. If FlowCanary does not launch by 30 November 2026, you get a full refund.

Data and privacy

  • Follows UK GDPR. The site sets no advertising or analytics cookies.
  • IP addresses are never stored raw: only a salted, one-way hash with the date, deleted after about two days.
  • A text copy of each check result (never the screenshot) is kept for about two days so you can ask for it by email, then deleted automatically.
  • Processors: Vercel (hosting), ActiveCampaign (waitlist and email), Resend (emails you ask for) and Stripe (payments). Your data is never sold.
  • Full details in the privacy notice.

Run the free checkerSee pricing