FOR REPLIT BUILDERS
It runs in the Replit editor.
That is not the same as working.
“Works in the workspace, fails in production” is the single most common Replit complaint, and it has a specific cause: the deployment is a different environment from the editor you built in. QAlaunch opens your deployed app in a real cloud browser — desktop and phone — and reports what an actual visitor runs into.
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What breaks between the workspace and your deployment
Replit deployments fail in a small number of very repeatable ways. These are the ones that reach real visitors rather than showing up in your logs.
CRITICAL
Secrets that never made it to production
Secrets set in the workspace are not automatically present in a deployment. Anything missing there is the classic cause of “works in the editor, fails in production” — the app loads, then a feature that depends on a key quietly dies.
CRITICAL
The app only runs while your tab is open
A workspace preview stops when the tab closes. If you shared a preview URL rather than a published deployment, your link is dead for everyone the moment you close Replit — and it looks fine to you right up until then.
HIGH
Stale assets served by an old service worker
Returning visitors can be served a cached bundle from a previous deploy, producing a blank page or a half-broken UI. You clear it without thinking; a visitor sees a broken app and leaves.
HIGH
A deployment that never passed its health check
If the homepage takes too long to respond, publishing can fail at the final step — leaving the previous version, or nothing at all, live at your URL while you assume the new one shipped.
HIGH
The mobile view nobody ever opened
The Replit preview pane is desktop-shaped and narrow, so mobile breakpoints are the least-verified part of most Replit apps: overflowing heroes, off-screen buttons, and text that is unreadable at 375px.
HIGH
Sign-up that only works because you were already signed in
Auth flows are routinely built while authenticated, so the genuinely-new-user path — form, confirmation email, redirect back in — is never walked end to end until a real person tries it.
How it works
1
Paste your Replit URL
Any publicly accessible page — your .replit.app deployment or your custom domain.
2
Real browser audit runs
We open it in a real cloud browser, take desktop and mobile screenshots, and run 35+ automated checks plus an AI visual review.
3
Get your report
Top issues in the free preview. Full report with every page from $9, one-time.
Check your deployed Replit app
No account needed. See your top issues in about 2 minutes.
Start Free Audit →Frequently asked questions
Does QAlaunch work on Replit apps?
Yes — on any publicly accessible deployment, whether that is a .replit.app URL or a custom domain. It tests the public pages a visitor can reach without an account; anything behind a login is not covered.
Why does my Replit app work in the editor but not after deploying?
The deployment is a separate environment from your workspace. Secrets do not carry over automatically, the start command has to actually run your server, and the deployed app runs for an anonymous visitor rather than for you. Most “works here, not there” reports trace back to one of those three.
Should I test the preview URL or the deployment?
Always the deployment. A workspace preview runs only while your tab is open and reflects your session and your environment — testing it tells you nothing about what your visitors get.
Do I need to give access to my Replit account?
No. Paste your public URL and the audit runs from the outside like any visitor. No account access, nothing installed, and your app is never modified.
What does it cost?
The free scan shows your top issues with no signup. Full reports are one-time purchases from $9 (single page) to $59 (up to 10 pages). No subscription.
Read more: 9 bugs every AI-built site ships with, why sites break on mobile but not desktop.
Test the deployment, not the preview
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