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KStarsSkySafari
Free

Free and open source from the KDE community.

 Paid

Commercial app sold through the developer's store and app stores.

Windows, macOS, Linux Android, iOS
  • Sky simulation with up to 100 million stars, plus comets and asteroids
  • Observation planner and calculation tools such as conjunction prediction
  • Telescope control over ASCOM Alpaca, INDI and Celestron WiFi
  • Plate solving to place your own astrophotos on the chart
  • The large feature set takes time to learn
  • Some information and imagery features rely on internet resources
  • Paid and closed source
  • Many features are aimed at telescope owners rather than casual stargazers
Downloadable app Downloadable app
Open source Closed source
License not stated License not stated
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 23, 2026

Checked October 2, 2026

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