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