CheckMate.bio is described as 'Reverse email lookup (OSINT) tool that finds the online accounts registered to any email address across 800+ social, dating, gaming, finance, and professional services, grouping the results by category with per-match confidence scores' and is an app in the security & privacy category. There are more than 10 alternatives to CheckMate.bio for a variety of platforms, including Web-based, Linux, SaaS, Mac and Windows apps. The best CheckMate.bio alternative is Blackbird OSINT, which is both free and Open Source. Other great apps like CheckMate.bio are SpiderFoot, Sherlock, IDCrawl and OSINT-tool.