# FlowCanary
> Free 30-second health check for apps built with Lovable, Bolt, Replit, v0 and Cursor. Paste a public URL and get a report on what real users and Google see, with a copy-paste fix prompt for each issue. No signup.

FlowCanary is passive: ordinary GET/HEAD requests plus loading pages in a headless browser. It never logs in, clicks, submits forms or creates accounts.
Who it's for: founders and makers who build with AI app builders (Lovable, Bolt, Replit, v0, Cursor) and want to know if their live app is broken.
What the free check covers: homepage status, speed, redirects and HTTPS; key pages (signup, login, pricing, checkout, contact, privacy, terms); broken links; raw HTML vs rendered page (blank single-page-app detection); robots.txt, sitemap, noindex, title, description, canonical and og:image; builder detection; JavaScript console errors; failed requests; forms and mobile overflow.
Not covered: pages behind a login, payments, security or penetration testing.
Plans and prices: Free health check $0. Daily monitoring of your signup, login and checkout (in development; founding spots $19/month, price locked for life, first 50 founders, no payment until it launches).

## Main pages
- [Free app health check](https://getflowcanary.com/): paste a URL, get a report in about 30 seconds
- [What is FlowCanary](https://getflowcanary.com/what-is-flowcanary): what it is, what it checks, plans and prices
- [Founding plan](https://getflowcanary.com/founding): reserve daily monitoring at $19/month, no card needed
- [Builder pages](https://getflowcanary.com/for): what breaks after you publish, by builder
- [FlowCanaryBot](https://getflowcanary.com/bot): what the crawler does and how to opt out
- [Privacy](https://getflowcanary.com/privacy)
- [Terms](https://getflowcanary.com/terms)

## Guides
- [Lovable App Not Showing on Google? Here's How to Find the Real Cause](https://getflowcanary.com/fix/lovable-not-indexed-google): Your Lovable app is live but invisible on Google. Check publishing, noindex, robots.txt, sitemap, rendering and Search Console, then run a free 30-second scan.
- [Lovable Stripe Checkout Not Working? Find Which Link in the Chain Broke](https://getflowcanary.com/fix/lovable-stripe-checkout-not-working): Stripe checkout won't open, errors out, or payments never update your Lovable app? Diagnose keys, edge functions, webhooks and redirect URLs step by step.
- [Supabase Auth Broke After Deploy? The Usual Suspects, in Order](https://getflowcanary.com/fix/supabase-auth-broken-after-deploy): Login worked locally, then broke in production: links go to localhost, OAuth fails, or users loop back to login. Fix Site URL, Redirect URLs, env vars and callbacks.
- [Bolt.new App Shows a Blank Page After Deploy? Fix the White Screen](https://getflowcanary.com/fix/bolt-blank-page-after-deploy): Your Bolt app works in the editor but shows a white screen once deployed. Check the console, publish directory, env vars, SPA redirects and asset paths.
- [Why Is My React SPA Not Indexed by Google?](https://getflowcanary.com/fix/react-spa-not-indexed): Google renders JavaScript, but React SPAs still get skipped. Learn how Google indexes SPAs, how to see what Googlebot sees, and the fixes that actually work.
- [A No-Code Checkly Alternative for Founders Who Don't Write Playwright](https://getflowcanary.com/compare/checkly-alternative-no-code): Want to know when signup or checkout breaks without writing Playwright scripts? Compare no-code synthetic monitoring options and start with a free 30-second app check.
- [Lovable App Works in Preview but Not When Published? Find the Difference](https://getflowcanary.com/fix/lovable-works-in-preview-not-published): Your Lovable app works in preview but breaks on the live URL. Check publishing, cache, secrets, auth redirects, database rules and custom domains.

## Builder pages
- [Lovable App Health Check: What Breaks After You Publish](https://getflowcanary.com/for/lovable): Built with Lovable? See what breaks after you publish: Google indexing, Supabase auth redirects, Stripe checkout, blank pages. Free 30-second check, no signup.
- [Bolt.new App Health Check: What Breaks After You Publish](https://getflowcanary.com/for/bolt): Built with Bolt.new? Catch blank pages, missing env vars, localhost auth redirects and broken links on your live bolt.host or Netlify site. Free 30-second check.
- [Replit App Health Check: Works in Preview, Broken When Published?](https://getflowcanary.com/for/replit): Replit app fine in Preview but broken at the published URL? Check production Secrets, localhost URLs, auth redirects and what visitors see. Free 30-second check.
- [v0 App Health Check: What Breaks After You Deploy to Vercel](https://getflowcanary.com/for/v0): Built with v0 and deployed on Vercel? Check env vars after redeploys, Supabase auth redirects, per-page metadata and what Google sees. Free 30-second check.
- [Health Check for Apps Built with Cursor: What Breaks After Deploy](https://getflowcanary.com/for/cursor): Shipped an app you built with Cursor? Catch SPA 404s on refresh, blank pages for Google, missing env vars, robots.txt blocks and broken links. Free 30-second check.

## Optional
- [Full guide text](https://getflowcanary.com/llms-full.txt)