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Oksigenia SOS vs SOS Alerter: catalog facts
Oksigenia SOS	SOS Alerter
Best for: Solo hikers and outdoor athletes who want an emergency alert without a cloud service	Best for: People who want a private, offline emergency alert app on Android
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL-3.0-or-later licence.
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	Sends emergency SMS and call alerts to chosen contacts Shares real-time location with trusted contacts All 3 strengths for SOS Alerter Sends emergency SMS and call alerts to chosen contacts Shares real-time location with trusted contacts Stores contacts and captured media locally on the device
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	Android only Alerts depend on SMS and phone service being available All 3 limitations for SOS Alerter Android only Alerts depend on SMS and phone service being available Small project with a short track record
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-or-later
No account needed	Not stated if an account is 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 SOS Alerter github.com/dhilipmpms/SOS-alerter f-droid.org/packages/org.sosalerter.app Catalog checked October 2, 2026

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