Have I Been Pwned is described as 'Website repository that checks what sites your email address was used on were compromised' and is a very popular Data Breach tool in the security & privacy category. There are more than 25 alternatives to Have I Been Pwned, not only websites but also apps for a variety of platforms, including Windows, SaaS, Mac and Linux apps. The best Have I Been Pwned alternative is Mozilla Monitor, which is both free and Open Source. Other great sites and apps similar to Have I Been Pwned are Data Breach Observatory, Intelligence X, DeHashed and LeakCheck.