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Gaia SkyStellarium
Free

Free and open source under the MPL-2.0.

 Free

Free and open source under the GPL 2.0, funded by donations and sponsorship.

Windows, macOS, Linux Windows, macOS, Linux, Android, iOS
  • Uses real scientific catalogs including Gaia star data
  • Handles around a billion objects in real time
  • Accurate sky for any location, date and time
  • Simulates the view through binoculars, telescopes and specific eyepieces
  • Large datasets need significant download space and capable hardware
  • Aimed at scientific exploration rather than a guided planetarium experience
  • The three-dimensional rendering needs a reasonable graphics card
  • Default catalogues are limited until you download the extra ones
Downloadable app Downloadable app
Open source Open source
License: MPL-2.0 License: GPL-2.0
No account needed No account needed
Not stated if it works offline Works offline

Checked October 1, 2026

Checked September 21, 2026

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