What it checks
- Whether your domain and www point anywhere, and to what: A, AAAA and CNAME records.
- Leftovers from a previous host, like a second A record pointing somewhere else.
- AAAA records that Lovable warns about and Bolt and Replit don’t support.
- Cloudflare’s proxy, the orange cloud, which gets in the way of setup.
- Your builder’s verification record, for Lovable and Replit.
- CAA records that stop your builder from getting a certificate.
- Whether the domain already loads over HTTPS.
It reads only public DNS records, the same ones anyone’s browser looks up, and nothing is saved. Each problem comes with a prompt you can paste into ChatGPT or Claude to get step-by-step help for your domain provider.
Still stuck?
Our guide to a custom domain that isn’t working explains each cause, how long to wait and where each builder keeps its domain settings.