Privacy Scanner (AntiSpy) Free - Privacy Scanner (AntiSpy) Free performs a deep scan and sends an alert if it catches someone trying to hack into your phone.

Find My - Find My can help you locate your devices and your friends and family.

Ostorlab - Ostorlab scans your web or mobile application and provides results showing threats and privacy issues.

Prey - Prey is the simplest and most reliable solution for tracking, data protection & management for Windows, Mac, and mobile devices. Track with precise location, wipe, reset and secure devices across all platforms.

Traced for Android - Traced is a free cybersecurity app for Android. It detects suspicious activity from apps and unsecured Wi-Fi connections that might be used to spy on you or invade your privacy.

PhoneTrack - Nextcloud app to create tracking sessions to display phones position in real time and export activity to gpx.