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Mozilla Monitorpwned
Free

Data breach monitoring and alerts are free.

 Free

Free and open source under the MIT license.

Web Command line
  • Free breach scan by email address
  • Ongoing alerts for new breaches
  • Checks account breaches and exposed passwords from the terminal
  • Supports JSON output for scripts and pipelines
  • Data broker removal service has been discontinued
  • Only covers breaches that are publicly known
  • Some searches require a Have I Been Pwned API key
  • Requires Node.js
Web application Downloadable app
Open source Open source
License: MPL-2.0 License: MIT
Not stated if an account is needed Not stated if an account is needed
Needs internet Not stated if it works offline

Checked September 23, 2026

Checked October 8, 2026

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