Compare software

WorldWide TelescopeStellarium
Free

Free and open source.

 Free

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

Web Windows, macOS, Linux, Android, iOS
  • Large collection of sky imagery in the browser
  • Guided tours with narration and slides
  • Accurate sky for any location, date and time
  • Simulates the view through binoculars, telescopes and specific eyepieces
  • Needs a fast internet connection
  • Interface can feel dense for newcomers
  • The three-dimensional rendering needs a reasonable graphics card
  • Default catalogues are limited until you download the extra ones
Web application Downloadable app
Open source Open source
License not stated License: GPL-2.0
Not stated if an account is needed No account needed
Needs internet Works offline

Checked October 2, 2026

Checked September 21, 2026

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