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Look4Sat vs Star Walk 2: catalog facts
Look4Sat	Star Walk 2
Free Free and open source under the GPL-3.0.	Freemium A free version is offered on Google Play; paid options are not detailed in the research.
Android	Android, iOS
Over 9000 active satellites from Celestrak and SatNOGS Search by NORAD catalog number or name	Real-time sky map based on your location Tracks satellites such as the ISS and Starlink
Android only Predictions depend on accurate location data	Mobile only, no desktop version Closed source
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.