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Have I Been Pwned vs Mozilla Monitor: catalog facts
Have I Been Pwned	Mozilla Monitor
Freemium Free breach and password checks; API access for breached accounts requires a subscription.	Free Data breach monitoring and alerts are free.
Web	Web
Search tens of billions of breached records by email Free Pwned Passwords check using a privacy-preserving range query	Free breach scan by email address Ongoing alerts for new breaches
Breached-account API access requires a paid subscription Only covers breaches that have been loaded into the service	Data broker removal service has been discontinued Only covers breaches that are publicly known
Hosted service	Web application
Closed source	Open source
License not stated	License: MPL-2.0
No account needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.