How to test a Lovable, Bolt, or v0 app
Apps built with Lovable, Bolt, and v0 render beautifully. That is exactly why their bugs are dangerous: everything looks finished, so nobody checks whether it actually works. Here is how to find out in about 30 seconds, without writing a line of test code.
How do I test an app built with Lovable?
Open your Lovable preview or published URL, then ask your AI agent to run Val on it. Val drives a real browser through the app, clicks every button, submits every form, runs accessibility and Lighthouse audits, and reports what is broken. Your agent fixes it and Val re-checks.
The prompt is just plain language. In Cursor, Claude Code, or Codex:
Run a Val review on my-app.lovable.app and fix anything broken.Why do Bolt and v0 apps have hidden bugs?
AI builders optimize for a result that renders and looks right. The wiring underneath is where bugs hide: buttons with no handler, forms that validate but never submit, API calls that fail silently, and accessibility attributes that were never added. These pass a visual check and fail a real user.
The five things to check on any AI-generated app
- Every button. Val clicks all of them and flags the dead ones.
- The signup and checkout. Val walks the funnel, even auto-filling the Stripe test card in test mode.
- Mobile. Val tests iPhone and Pixel profiles, not just desktop.
- Accessibility. Val runs the full axe-core WCAG audit.
- Hidden API failures. Val captures the network and catches the 200s that hide an error.
Do I need to deploy my app to test it?
No. Val runs against localhost as well as any deployed preview URL, so you can test while you build. It also tests the published version once you ship.
Works with the tool you already use
Val is an MCP server, so it plugs into Cursor, Claude Code, Codex, and Windsurf. Whatever you used to build your Lovable, Bolt, or v0 app, the same AI agent can now test it. You add one block to your MCP config and ask.
Stop asking your friends to test your app.
Val plugs into Cursor, Claude Code, or Codex. $4.99/month, cancel anytime.
Get Val