Email · head-to-head
mailboxlayer vs MailCheck.ai
mailboxlayer
A REST service from APILayer that checks whether an email address is syntactically valid, resolves to real DNS/MX records, and flags free or disposable providers in one call. Free for light personal use, with paid tiers for higher volume.
MailCheck.ai
MailCheck.ai has rebranded to UserCheck, but its original keyless lookup endpoint keeps working unchanged: pass an address and get back disposable, free-provider, MX, and domain-age signals in one JSON response, aimed at blocking throwaway signups. The rebranded product adds a free-to-start paid tier for higher-volume, authenticated use.
| mailboxlayer | MailCheck.ai | |
|---|---|---|
| Authentication | API Key | None |
| Pricing | freemium | freemium |
| Formats | JSON | JSON |
| CORS | yes | yes |
| HTTPS | Yes | Yes |
MailCheck.ai needs no API key, while mailboxlayer requires API Key — pick MailCheck.ai to start without signup.