Compare software

Cartes du Ciel (SkyChart)Star Walk 2
Free

Free software under the GPL.

 Freemium

A free version is offered on Google Play; paid options are not detailed in the research.

Windows, macOS, Linux Android, iOS
  • Uses many star and deep-sky catalogues
  • Shows planets, asteroids and comets
  • Real-time sky map based on your location
  • Tracks satellites such as the ISS and Starlink
  • The number of settings can overwhelm casual stargazers
  • Interface is functional rather than polished
  • Mobile only, no desktop version
  • Closed source
Downloadable app Downloadable app
Open source Closed source
License: GPL License not stated
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked October 2, 2026

Checked October 2, 2026

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