holehe

holehe answers a narrower question than blackbird: is this email registered on a given site? It infers that from login, registration, and password-recovery flows without notifying the address. Email only — usernames go to blackbird, Google accounts to GHunt.

The two tools disagree usefully because they use different site lists and different techniques. Rate limits also dominate holehe results, so every hit count is a floor, not a total. A quiet site is not a no.

Same vault convention as the rest of the OSINT set: dossiers under Personal-OSINT, authorized targets only. Upstream: megadose/holehe.