Instead of Celestia
Celestia alternatives
Celestia is a free, open-source 3D space visualization project for exploring planets, moons, star clusters and galaxies from different points in space and time. It calculates solar-system positions and motion in real time, lets you visit celestial worlds and see objects in their skies, and supports add-ons for extra objects, textures, models and spacecraft. Its reach across Android, iOS, Linux, macOS, web and Windows gives it broad access, though the browser edition is lite and the latest stable Linux release is provided as source code.
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NASA Eyes
Free plan Open source AndroidiPhoneLinux+4Exploring NASA missions, Earth data and exoplanets — NASA Eyes focuses on NASA data, including Earth science missions, asteroid approaches and more than 5,500 confirmed exoplanet systems.
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SkyORB
Free plan AndroidiPhoneMac+1Location-based sky charts, alerts and augmented reality — SkyORB adds location-based event alerts, real-time sky charts and augmented-reality overlays, while Celestia centers on exploring space in 3D.
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Solar System Scope
Free plan AndroidiPhoneMac+2A 3D solar-system encyclopedia and night-sky viewing — Solar System Scope combines a 3D encyclopedia and location-based night-sky view with mobile pointing tools, while Celestia covers galaxies and add-on content.
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Cosmic Watch
Free plan AndroidiPhoneMacA planetarium clock with sky guide and event alerts — Cosmic Watch adds a sky-pointing guide, world clock and astrology mode; subscriptions or Cosmic Pro unlock additional tools and charts.
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ISS Detector
Free plan AndroidiPhoneMac+1ISS pass predictions and sighting alerts — ISS Detector predicts visible ISS passes for your location and alerts you before they start, unlike Celestia’s general space visualization.
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Star Chart
Free plan AndroidiPhoneMac+1Offline sky identification and guided exploration — Star Chart identifies the sky from your device’s position, maps over 20 million stars and supports normal use without internet; Celestia spans galaxies and add-ons.
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Star Chart
Free plan AndroidiPhoneMac+1Sky mapping with optional augmented or VR exploration — Star Chart adds mobile augmented reality and a VR solar-system simulation, while Celestia offers broader space visualization and add-on catalogues.
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Gaia Sky
Free plan Open source APILinuxMac+2 - 9
Aladin Desktop
Free plan LinuxMacWindows - 10
Heavens-Above
Free plan AndroidiPhoneWeb - 11
DWARFLAB App
Free plan AndroidiPhone - 12
KStars
Free plan LinuxMacWindows - 13
Night Sky
Free plan AndroidiPhoneMac - 14
BXA
Free plan Linux - 15
Luminos Pro
Free plan iPhoneMac - 16
OpenSpace
Free plan LinuxWindows - 17
Seestar App
Free plan AndroidiPhoneMac+1 - 18
Singularity
Free plan AndroidiPhone - 19
Sky Guide
Free plan iPhoneMac - 20
SkyPortal
Free plan AndroidiPhone - 21
Stellarium
Free plan LinuxMacWeb+1 - 22
SkyView
Free plan AndroidiPhone6.9 Visit site - 23
Spacecraft AR
Free plan AndroidiPhone - 24
Halotools
Free plan Linux
An alternative may fit better if your interest is narrower or more tied to observing from Earth. NASA Eyes brings NASA mission and Earth data into interactive views; several other options identify objects in the local sky, while ISS Detector focuses on pass predictions and alerts. When choosing, weigh whether you want a broad space simulation or a sky guide, event notifications, or a specific data collection. Also compare supported devices and any paid features: some alternatives lack Celestia’s platform breadth or put extra tools behind a subscription or purchase.