Hypatia is the worlds first FOSS malware scanner for Android. It is powered by ClamAV style signature databases. Features Near zero battery impact: you'll never notice any impact on battery at all Extremely fast: it can scan small files (1MB) in <20ms, and even large files (40MB) in 1000ms. Memory efficient: with the default databases enabled it uses under 120MB. Regular scan: allowing selection of /system, internal storage, external storage, and installed apps Realtime scanner: can detect malware in realtime on write/rename in internal storage Completely offline: Internet is only used to download signature databases, files will never ever leave your device Persistence: will automatically restart on boot/update Tiny codebase: coming in at under 1000 sloc, it can be audited by even someone with basic programming experience Minimal dependencies: the app only uses libraries when necessary Signature databases can be enabled/disabled at the users demand