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Look4Sat vs N2YO: catalog facts
Look4Sat	N2YO
Free Free and open source under the GPL-3.0.	Free Free to use in the browser.
Android	Web
Over 9000 active satellites from Celestrak and SatNOGS Search by NORAD catalog number or name	Tracks tens of thousands of objects in real time Pass predictions for your own location
Android only Predictions depend on accurate location data	Busy page with news and partner links Requires an internet connection
Downloadable app	Web application
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
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.