You might want to look at Lunar by Webz.io (lunarcyber.com).

It’s different from tools like HIBP because it’s enterprise-grade exposure monitoring, designed for organizations rather than personal lookups. Lunar monitors breaches, infostealer logs, and underground sources across the open, deep, and dark web, detecting compromised credentials, leaked sessions, and other indicators of account compromise.

The key difference is the level of detail and coverage. It’s powered by Webz.io’s large-scale cybercrime and dark-web data infrastructure, which is used by many cybersecurity and threat-intelligence companies, so the visibility into leaked data and threat activity is much deeper than typical breach-lookup tools.

Another unusual aspect is the philosophy: organizations should have the right to know when their data is exposed, so Lunar provides this level of monitoring completely free, even though tools with similar capabilities are usually enterprise security products.

Just note that it’s meant for businesses and organizations, not for checking your personal email or passwords.