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Compare OwnTracks Recorder with alternatives
OwnTracks Recorder vs Colota
Colota is an Android tracker that sends location to many self-hosted backends or any HTTPS endpoint, so it is a client rather than a storage server like OwnTracks Recorder.
OwnTracks Recorder vs Traccar
Traccar is an open-source GPS tracking server that works with many tracker devices and has its own web and mobile apps, plus geofence alerts and trip reports.