---
title: "Test login emails in apps built with AI tools"
description: "AI app builders and coding agents set up login in minutes. Which login each one gives you, and how to check its codes, magic links and reset emails work."
url: https://proxymail.qa/built-with
---

AI app builders

# Test the sign-up and login emails your AI-built app sends.

Lovable, Replit, Bolt, Base44, v0, Claude Code, Codex, Qoder, Cursor and Antigravity can build sign-up and login in a single prompt. Whether the confirmation email arrives, links to the right place and works exactly once is still on you. Pick your tool for a step-by-step check.

- [LovableWhich Lovable Cloud logins send email, the Site URL and sender settings, and a check before you launch.Read the guide](https://proxymail.qa/built-with/lovable)
- [ReplitReplit Auth, Clerk Auth or your own: which send email, and how to test each on the published app.Read the guide](https://proxymail.qa/built-with/replit)
- [BoltTurn on email confirmation, fix the localhost Site URL and test every auth email before you publish.Read the guide](https://proxymail.qa/built-with/bolt)
- [Base44Test the sign-up code, password reset and invites, and every user role, with a test account per role.Read the guide](https://proxymail.qa/built-with/base44)
- [v0Set Supabase’s Site URL and redirects for Vercel deployments, or move Clerk to production, then test every login email.Read the guide](https://proxymail.qa/built-with/v0)
- [Claude CodeCheck the auth emails in apps you build with Anthropic’s coding agent, from localhost to staging.Read the guide](https://proxymail.qa/built-with/claude-code)
- [OpenAI CodexRun the real email flow once before you merge a Codex change that touches sign-up or login.Read the guide](https://proxymail.qa/built-with/codex)
- [QoderCheck the real sign-up, code and reset emails after the agent changes your auth code, or let it check them itself.Read the guide](https://proxymail.qa/built-with/qoder)
- [CursorCheck the real sign-up, magic-link and reset emails after the agent changes your auth code.Read the guide](https://proxymail.qa/built-with/cursor)
- [Google AntigravityKeep unverified Firebase users out, check authorized domains and the sender, and let the agent run the check.Read the guide](https://proxymail.qa/built-with/antigravity)
- [Login methods explainedEmail, codes, magic links, Google and Apple buttons, phone and SSO: what each sends, what breaks and how to test it.Read the guide](https://proxymail.qa/built-with/login-methods)

[See every email testing problem we solve](https://proxymail.qa/solve)

## Five checks for any AI-built app

1. The email arrives  
Within seconds, from the sender name your users will recognise, and not in a spam folder of a test account nobody reads.
2. The link goes to the live app  
Not localhost:3000 or an old preview URL. This is the single most common bug in AI-built auth flows.
3. Codes and links work once  
A used or expired link should fail with a helpful message, and a new code should replace the old one.
4. Password reset works end to end  
Request, receive, set a new password and sign in with it.
5. Invites and roles work  
Each role gets the right email and lands on the right screens.

## Your next sign-up test is one click away.

Free plan, no credit card. Addresses last up to 30 days.

[Create a free account](https://app.proxymail.qa/?mode=signup&from=built-with)