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