4 alternatives to PassKnight for Data breach check: Password Audit Bot, Have I been pwned?, LeakCheck. Ranked by the HotBots score, checked automatically.
A password-only breach checker that never sends your full password anywhere: it uses k-Anonymity (only a truncated SHA-1 hash prefix) against the Have I Been Pwned "Pwned Passwords" API, with open-source code so you can verify the claim yourself.
Send your own email address and it tells you whether that address has surfaced in a known data breach — a simple, unofficial Telegram front-end for the "have I been pwned" checking model. Never enter your actual password into it.
The Telegram bot of LeakCheck.io, a commercial breach-data search company operating since 2018 — check your own email or phone for free against their database. Its parent company also sells broader paid lookups, so treat the free bot strictly as a self-check tool.
A minimal "check your email against known leaks" bot triggered with /pwn3d — its Telegram profile carries almost no description, but its open-source code confirms the safe email-only self-check pattern, so it is published with that caveat spelled out.