The best free alternative to Find My Device is Prey, which is also Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Find My Device and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Find My Device are Lookout Mobile Security, µlogger, Find My and PhoneTrack.
Lookout combines enterprise grade security with end user simplicity, protecting your device and data from a variety of threats facing mobile devices including: loss, theft, viruses, malware, and hackers.
µlogger [micro-logger] is an android application for continuous logging of location coordinates, designed to record hiking, biking tracks and other outdoor activities. This app works with a self-hosted server.
The new Find My app combines Find My iPhone and Find My Friends into a single, easy-to-use app on iOS, iPadOS, and now macOS.* Find My can help you locate your devices and your friends and family. And now it can help you find your devices — even when they’re offline.
Ever lost your phone and you go to call it to listen for the ringer and remember its on silent mode? Now when you lost it you can text your phone and it will turn silent mode off, the ringer vol up, and start ringing.