Most breach checkers use one database. Breach Watchdog combines Have I Been Pwned, LeakCheck and XON for a complete picture. Free, with unlimited scans, your risk score, and full attack profile (what a criminal could know about you). Password checks use k-anonymity, so your password never leaves the device. No email storage, no account needed. Also scans domains for SPF/DMARC spoofing gaps and checks URLs for phishing/malware. Details in the post below.