Security and privacy

BillionVerify alternatives

1 open-source project that already does this job. Free to use - not free to run, which is what the numbers on the right are for.

The full assessment →

The projects

reacherhq/check-if-email-exists9,261licence unclearRust service that verifies email existence and includes a simple HTTP backend endpoint.Open on GitHub

What you give up either way

Large proprietary reputation and spam-trap datasets used to boost accuracy
Pre-built integrations catalogue (25+ platform integrations)
White-label portal and enterprise billing/invoicing workflows
Customer support, SLA, and large-scale operational experience verifying millions monthly
Any proprietary AI agent integrations or internal tuning documented on the site

An open-source project doing the core job proves a replacement is possible. It does not prove it matches BillionVerify, and it does not prove anyone has run it for a month. How we decide.