FOR v0 BUILDERS
It looked perfect in the v0 preview.
Then you deployed it.
The most reported v0 problem is not bad code — it is the gap between the preview and the deployment. Layouts that render perfectly in v0 arrive misaligned in production, and the person who built it never sees it, because they are logged into Vercel and viewing on a desktop. QAlaunch opens the deployed URL as an anonymous visitor on a real phone.
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What breaks between the v0 preview and production
These are the failures v0 builders report most — and the ones you are least likely to catch yourself, because your own browser is the best case.
CRITICAL
Deployment Protection blocking every real visitor
With Vercel Deployment Protection enabled, visitors hit a login wall instead of your site. You never see it: you are already authenticated with Vercel, so the page loads perfectly for you and for nobody else.
CRITICAL
The layout crashes in production but not in preview
Styles that resolve correctly inside the v0 preview can arrive missing or misapplied on the deployed site, leaving sections misaligned or unstyled — the single most common v0 complaint.
CRITICAL
Sign-in that fails only after deploying
OAuth redirect URIs configured for the preview do not match the production URL, so login works throughout development and breaks for the first real user who tries it.
HIGH
Data and animations dead on iPhone
Apps that behave correctly on a desktop can load without their data or with animations that never run on a real phone — a failure mode invisible in a desktop-width preview pane.
HIGH
Half-fixed UI left by an error loop
Asking v0 to fix an error can introduce a related one, and iterating leaves components that render but no longer do what they did two prompts ago. The page still looks finished.
MEDIUM
A generic title in Google, not the one you set
Metadata that resolves correctly in preview can fall back to a default in the deployed environment, so your page shows up in search results with the wrong title or no description at all.
How it works
1
Paste your v0 URL
Any publicly accessible page — your .vercel.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 v0 app
No account needed. See your top issues in about 2 minutes.
Start Free Audit →Frequently asked questions
Does QAlaunch work on apps built with v0?
Yes — on any publicly accessible deployment, whether that is a .vercel.app URL or a custom domain. It checks the public pages a visitor reaches without an account.
Why does my v0 app look right in the preview and broken after deploying?
The preview and the deployment are different environments. Styles, metadata, and route handling can resolve differently once built for production, and the deployed app runs for an anonymous visitor rather than for your logged-in session. Always judge the deployed URL, never the preview.
My site works for me but others say it asks them to log in. Why?
That is almost always Vercel Deployment Protection still enabled on the project. Because you are signed into Vercel, the protection is transparent to you and absolute for everyone else. Open your deployed URL in an incognito window to see what visitors actually get.
Do I need to connect my Vercel account?
No. Paste your public URL and the audit runs from the outside like any visitor. No account access, nothing installed, and your project 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.
See the deployed site as a visitor sees it
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