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Star Walk 2 vs Cartes du Ciel (SkyChart): catalog facts
Star Walk 2	Cartes du Ciel (SkyChart)
Freemium A free version is offered on Google Play; paid options are not detailed in the research.	Free Free software under the GPL.
Android, iOS	Windows, macOS, Linux
Real-time sky map based on your location Tracks satellites such as the ISS and Starlink	Uses many star and deep-sky catalogues Shows planets, asteroids and comets
Mobile only, no desktop version Closed source	The number of settings can overwhelm casual stargazers Interface is functional rather than polished
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL
Not stated if an account is needed	No account needed
Not stated if it works offline	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.