Okta's PassProtect Chrome extension also uses k-anonymity.
https://www.okta.com/blog/2018/05/add-passprotect-to-your-we...
Re:K-anonymity
by manigandham on Sunday August 12, 2018 @04:25AM
(#17743505)
Looks like that's just a wrapper around the Have I Been Pwned API, of which there are many examples. 1Password built it into their password manager which is probably one of the best integrations for it.
https://www.troyhunt.com/ive-just-launched-pwned-passwords-v...
https://blog.cloudflare.com/validating-leaked-passwords-with...