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Oksigenia SOS vs PhoneTrack SMS: catalog facts
Oksigenia SOS	PhoneTrack SMS
Best for: Solo hikers and outdoor athletes who want an emergency alert without a cloud service	Best for: Sharing your location with trusted contacts where mobile data is unreliable
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-3.0 licence; normal SMS charges may apply.
Android	Android
Alerts sent by SMS, no mobile data needed No account, cloud or Google services All 3 strengths for Oksigenia SOS Alerts sent by SMS, no mobile data needed No account, cloud or Google services Shares GPS coordinates automatically	Works without a data connection or any server Replies include accuracy, battery level and a configurable map link All 3 strengths for PhoneTrack SMS Works without a data connection or any server Replies include accuracy, battery level and a configurable map link No account required
Relies on SMS, so it needs some mobile signal Android only All 3 limitations for Oksigenia SOS Relies on SMS, so it needs some mobile signal Android only Small project with no packaged GitHub releases	Anyone who learns the keyword can request your location Depends on SMS coverage and may incur text message costs All 3 limitations for PhoneTrack SMS Anyone who learns the keyword can request your location Depends on SMS coverage and may incur text message costs Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-only
No account needed	No account needed
Offline features available	Offline features available
Official website Full listing and sources Sources for Oksigenia SOS github.com/OksigeniaSL/oksigenia-sos f-droid.org/packages/com.oksigenia.oksigenia_sos Catalog checked October 2, 2026	Official website Full listing and sources Sources for PhoneTrack SMS github.com/gideontek/phonetrack Catalog checked October 2, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.