Is your AI-built app actually working? Free outside-in check

by Destiny Rath

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Oct 28, 2026 Developer Tools

app monitoring backend check performance testing supabase website status

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paste your app's address and it checks from the outside, using only what any visitor can download, whether the app is up and whether the Supabase backend behind it still answers. Free, no sign-up, about 20 seconds. What it checks: - whether the page loads, and whether the host is showing its own page instead of your app: "not found" pages on Vercel, Lovable, Bolt, Base44 and Firebase, Vercel's "paused" page, and takedown pages on Vercel and Lovable (if it doesn't...