Lovable App Shows a Blank Screen After Deploy
Quick Answer
How do I fix Lovable App Shows a Blank Screen After Deploy?
Missing environment variables in Vercel. The app works in Lovable's preview because Lovable injects the variables automatically. Vercel doesn't know about them. Start with "Read the real error" before making broader code changes.
Fix signals
- What this answers
- Why lovable app shows a blank screen after deploy happens and what to change first.
- Fastest move
- Read the real error
- Use this page if
- Works in Lovable preview
If this keeps happening
Open the next decision, not just the patch
Use these when the current fix is helpful, but the real answer is a better tool choice, a cleaner workflow layer, or a more trustworthy launch path.
Lovable reviews
Open this when the same full-stack MVP failures keep repeating and you need a harder answer on whether Lovable is still the right bet.
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Cursor review
Open this when the pattern behind the bug is really about generated speed versus owning more of the stack in code.
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Deploy hub
Open this when the fix is exposing a bigger production handoff problem, not just one broken feature.
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Tool picker
Open this when the repeated bug is making you question the whole stack choice instead of the latest patch.
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Firecrawl review
Open this when the app also needs live web data and the next stack decision is no longer only about the builder itself.
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Quick Fix Summary
| Most likely cause | Missing environment variables in Vercel. The app works in Lovable's preview because Lovable injects the variables automatically. Vercel doesn't know about them. |
| Fastest fix | Read the real error |
| Use this page if | Works in Lovable preview |
Exact errors people search for
If one of these matches what you are seeing, you are likely on the right fix page.
App works in Lovable preview but shows a blank screen on Vercel White screen after deploy with no visible error Live URL loads but nothing renders
You're in the right place if...
- !Works in Lovable preview
- !Shows blank white screen on Vercel URL
- !No error message — just white
Why this happens
Missing environment variables in Vercel. The app works in Lovable's preview because Lovable injects the variables automatically. Vercel doesn't know about them.
Fix
Read the real error
Open your deployed site, press F12 to open DevTools, click the Console tab. The actual error is hiding here. Read it before doing anything else.
Add environment variables to Vercel
Go to Vercel Dashboard → Your Project → Settings → Environment Variables. Add every variable from your .env.local file. Every single one.
NEXT_PUBLIC_SUPABASE_URL=https://xxx.supabase.co NEXT_PUBLIC_SUPABASE_ANON_KEY=eyJ... STRIPE_SECRET_KEY=sk_test_...
Redeploy
Environment variables don't apply to existing deployments. Go to Vercel Dashboard → Deployments → three dots on latest → Redeploy.
Prevent this next time
Before deploying, make a checklist of every environment variable in your .env.local file. Add them all to Vercel before the first deploy.
Frequently Asked Questions
Lovable preview auto-injects environment variables. Vercel requires you to add them manually.
In Lovable, check the Supabase integration panel. Your Supabase URL and anon key are there. Stripe keys are in the Stripe dashboard.
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