Celestia

Web · Windows · Mac · Linux · Android · iPhone

Freedom report

Three barsScore 6.7

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely6 of 6 device platforms
DocumentedPlans, terms and facts published

Celestia is ranked #2 of 34 in astronomy apps on Freedom251. It runs on Android, iOS, Linux, macOS, Web, Windows. There is a free plan.

Celestia plans and pricing

All plans

Celestia Free Free software under the GNU General Public License celestia.mobi · 4 Oct 2026

Compared on astronomy apps

Free plan: Yes
Platform coverage: cross-platform

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The record

Purpose: Celestia is a real-time 3D visualization of space.
Celestial objects: It simulates objects from planets and moons to star clusters and galaxies, viewable from different points in space and time.
Orbital motion: The positions and movements of solar system objects are calculated in real time at any desired rate.
Planetarium: Users can navigate to celestial worlds, land on their surfaces, and see solar system objects in the sky.
Add-ons: Catalogues can be expanded with add-ons containing objects, high-resolution textures, 3D models, spacecraft, and fictional objects.
Privacy: The site states that Celestia collects data only for analytic and diagnostic purposes.
License: Celestia is licensed under the GNU General Public License.
Open source: The project describes Celestia as open source and links to source code for its mobile frontends and original project.
Support: The original project directs users to its forum or GitHub discussions, while frontend and website feedback can go through in-app feedback, GitHub issues, or email.
Android availability: The Android version is available through Google Play, as a GitHub APK, and through alternative markets, which may differ in features.
Apple availability: The iOS, iPadOS, and macOS versions are available on the App Store, with a direct GitHub download also offered for macOS.
Windows availability: The Windows version is available through Microsoft Store or by sideloading the version provided on GitHub.
Browser version: A lite version of Celestia can be tried in a web browser.
Linux support: The latest stable original project release, version 1.6.4, is listed for Linux as source code.
Price from: Free

Where it ranks on Freedom251

Best Astronomy Apps in 2026#2 of 34

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Sources

celestia.mobi· checked 4 Oct 2026
celestia.mobi/download· checked 4 Oct 2026