The Best Astronomy Apps in 2026
We researched astronomy apps through official websites, including pricing pages, plan tables, and product documentation. Rankings focus on each app’s core astronomy job, value for money, and verified features for learning about and exploring the night sky.
Our top picks
-
Top ranked
Stellarium#1 of 349.3/10A capable free desktop planetarium with telescope control, scripting, and offline access.
Free plan
-
Runner-up
KStars#2 of 349.2/10A capable free desktop toolkit for sky simulation, planning, and astrophotography.
Free plan
-
Top-ranked free plan
WorldWide Telescope#3 of 349.1/10A free, open-source astronomy platform for visualization, tours, and telescope projects.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 34 tools, best first
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Best forFree desktop planetarium and telescope control
A capable free desktop planetarium with telescope control, scripting, and offline access.
- Telescope control
- Mission tracking
- Offline access
9.3/10★★★★★Visit Stellarium -
Best forFree astronomy and astrophotography workflows
A capable free desktop toolkit for sky simulation, planning, and astrophotography.
- Telescope control
- Offline access
- Learning content
9.2/10★★★★★Visit KStars -
Best forFree visualization, tours, and telescope projects
A free, open-source astronomy platform for visualization, tours, and telescope projects.
- Telescope control
- Mission tracking
- Learning content
9.1/10★★★★★Visit site -
Best forFree Celestron telescope users and learners
A free mobile astronomy guide with AR viewing, learning content, and Celestron telescope control.
- Telescope control
- AR sky view
- Learning content
8.8/10★★★★☆Visit Celestron -
Best forMobile learners exploring the night sky
A mobile sky guide pairing AR object identification with astronomy learning content.
- AR sky view
- Mission tracking
- Offline access
8.7/10★★★★☆Visit Star Walk 2 -
Best forMobile stargazers planning what to see tonight
A free mobile sky guide combining object identification, AR, and observing plans.
- AR sky view
- Learning content
8.6/10★★★★☆Visit Sky Tonight -
Best forSatellite watchers and ISS trackers
A focused, free-to-start choice for tracking ISS and satellite passes.
- Mission tracking
- Offline access
8.5/10★★★★☆Visit Heavens-Above -
Best forAffordable solar-system learning across platforms
A cross-platform astronomy app combining real-time simulation, learning content, and mobile sky pointing.
- AR sky view
- Mission tracking
- Offline access
8.4/10★★★★☆Visit site -
Best forApple users wanting rich AR and telescope features
A feature-rich astronomy app for Apple users who want observation tools beyond sky maps.
- Telescope control
- AR sky view
- Mission tracking
7.9/10★★★★☆Visit Luminos Pro -
Best forSerious observers wanting broad telescope tools
A paid astronomy app with strong telescope control, planning, and astrophotography tools.
- Telescope control
- AR sky view
- Mission tracking
7.9/10★★★★☆Visit SkySafari -
Best forOffline iPhone and Mac sky identification
A capable offline sky guide with AR overlays, event tracking, and paid catalog expansions.
- AR sky view
- Mission tracking
- Offline access
7.9/10★★★★☆Visit Sky Guide -
Best foriOS observers who want detailed charts and equipment tools
A free iOS and macOS sky atlas with deep catalogs and equipment field-of-view tools.
- Offline access
7.9/10★★★★☆Visit Starmap -
Best forData-rich scientific astronomy exploration
A deep scientific astronomy explorer for desktop users who value data over simplicity.
- Mission tracking
- Offline access
- Learning content
7.9/10★★★★☆Visit Gaia Sky -
Best forAstronomical image and survey analysis
A free, open-source desktop atlas for exploring images, surveys, catalogs, and astronomy data.
- Learning content
7.8/10★★★★☆Visit Aladin Desktop -
Best forFeature-rich mobile stargazing and learning
A broad astronomy app combining sky identification, AR, learning, missions and AI guidance.
- AR sky view
- Mission tracking
- Offline access
7.7/10★★★★☆Visit Night Sky -
Best forUNISTELLAR telescope owners
A free mobile companion with telescope control, guided viewing, and citizen science.
- Telescope control
- Mission tracking
- Offline access
7.5/10★★★★☆Visit UNISTELLAR -
Best forSeestar telescope owners and astrophotographers
A free control and imaging app whose main value depends on Seestar telescope hardware.
- Telescope control
- Offline access
- Learning content
7.4/10★★★★☆Visit Seestar App -
Best forDWARF telescope astrophotography users
A free mobile companion with telescope control, stacking, processing, and AR framing.
- Telescope control
- AR sky view
- Offline access
7.3/10★★★★☆Visit DWARFLAB -
Best forVaonis telescope imaging and planning
A free mobile companion for automated Vaonis telescope imaging and observation planning.
- Telescope control
- Learning content
7.2/10★★★★☆Visit Vaonis -
Best forApple users wanting AR sky maps
A feature-rich astronomy suite for Apple users who want AR sky identification.
- AR sky view
- Learning content
7.1/10★★★★☆Visit SkyORB -
Best forSimple offline AR object identification
A simple offline AR guide for identifying objects across the night sky.
- AR sky view
- Offline access
- Learning content
7.0/10★★★★☆Visit SkyView -
Best forAR-guided casual stargazing
A versatile AR stargazing app for casual observers across Apple and Android devices.
- AR sky view
- Learning content
6.9/10★★★☆☆Visit Cosmic Watch -
Best forFree NASA missions and space education
A free, browser-based NASA experience for exploring missions, planets, Earth data, and space science.
- Mission tracking
- Learning content
6.7/10★★★☆☆Visit NASA Eyes -
Best forFree cross-platform AR sky identification
A free, cross-platform AR sky guide for beginners, families, and casual observers.
- AR sky view
- Offline access
- Learning content
6.6/10★★★☆☆Visit Star Chart -
Best forFree customizable 3D space exploration
A free desktop simulator for exploring and customizing a detailed 3D universe.
6.6/10★★★☆☆Visit Celestia -
Best forPlanetarium installations and immersive science
A specialized 3D astronomy environment for missions, science catalogs, and immersive displays.
- Mission tracking
- Learning content
6.5/10★★★☆☆Visit OpenSpace -
Best forGravity, climate, and space-simulation experiments
A focused desktop simulator for experimenting with gravity, climate, collisions, and stellar evolution.
- Mission tracking
- Learning content
6.4/10★★★☆☆Visit Universe -
Best forProcedural universe exploration on Windows
A deep Windows simulator for exploring real and procedurally generated space.
- Learning content
6.3/10★★★☆☆Visit SpaceEngine -
Best forISS, Starlink, and satellite alerts
A focused astronomy app for ISS, Starlink, and satellite alerts.
6.1/10★★★☆☆Visit ISS Detector -
Best forFree ISS sightings and alerts
A free NASA app for finding, timing, and following International Space Station passes.
- AR sky view
- Offline access
- Learning content
6.0/10★★★☆☆Try Spot the Station -
Best forEducational spacecraft AR experiences
A free mobile AR app for exploring NASA spacecraft and their missions.
5.9/10★★★☆☆Visit Spacecraft AR -
Best forBayesian astronomical model fitting
A focused Linux toolkit for Bayesian fitting, comparison and discovery in X-ray spectra.
5.8/10★★★☆☆Visit BXA -
Best forSynthetic galaxy-population research
A free, research-focused Python toolkit for synthetic galaxies and halo-catalog statistics.
5.7/10★★★☆☆Visit Halotools -
Best forResearchers modeling exoplanet transit light curves
An open-source Python package for transit modeling, with support for non-spherical planets.
5.6/10★★★☆☆View documentation
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Offline access | Platform coverage | Score |
|---|---|---|---|---|---|---|
| 1 | Stellarium | Yes | Free | Yes | Desktop | 9.3 |
| 2 | KStars | Yes | Free | Yes | Desktop | 9.2 |
| 3 | WorldWide Telescope | Yes | Free | No | Cross-platform | 9.1 |
| 4 | SkyPortal | Yes | Free | Mobile | 8.8 | |
| 5 | Star Walk 2 | Yes | Yes | Mobile | 8.7 | |
| 6 | Sky Tonight | Yes | Mobile | 8.6 | ||
| 7 | Heavens-Above | Yes | Yes | Cross-platform | 8.5 | |
| 8 | Solar System Scope | Yes | $9.80 one-time | Yes | Cross-platform | 8.4 |
| 9 | Luminos Pro | Yes | Yes | Mobile | 7.9 | |
| 10 | SkySafari | No | $6.99 one-time | Yes | Mobile | 7.9 |
| 11 | Sky Guide | Yes | Yes | Cross-platform | 7.9 | |
| 12 | Starmap | Yes | Free | Yes | Mobile | 7.9 |
| 13 | Gaia Sky | Yes | Free | Yes | Desktop | 7.9 |
| 14 | Aladin Desktop | Yes | Free | Desktop | 7.8 | |
| 15 | Night Sky | Yes | Yes | Cross-platform | 7.7 | |
| 16 | UNISTELLAR App | Yes | Free | Yes | Mobile | 7.5 |
| 17 | Seestar App | Yes | Free | Yes | Mobile | 7.4 |
| 18 | DWARFLAB App | Yes | Free | Yes | Mobile | 7.3 |
| 19 | Singularity | Yes | Free | No | Mobile | 7.2 |
| 20 | SkyORB | Yes | Cross-platform | 7.1 | ||
| 21 | SkyView | No | Yes | Mobile | 7.0 | |
| 22 | Cosmic Watch | Yes | Cross-platform | 6.9 | ||
| 23 | NASA Eyes | Yes | Free | No | Cross-platform | 6.7 |
| 24 | Star Chart | Yes | Yes | Cross-platform | 6.6 | |
| 25 | Celestia | Yes | Free | Cross-platform | 6.6 | |
| 26 | OpenSpace | Yes | Free | Cross-platform | 6.5 | |
| 27 | Universe Sandbox | No | Desktop | 6.4 | ||
| 28 | SpaceEngine | No | Desktop | 6.3 | ||
| 29 | ISS Detector | Yes | Cross-platform | 6.1 | ||
| 30 | Spot the Station | Yes | Free | Yes | Mobile | 6.0 |
| 31 | Spacecraft AR | Yes | Free | 5.9 | ||
| 32 | BXA | Free | Desktop | 5.8 | ||
| 33 | Halotools | Yes | Free | 5.7 | ||
| 34 | squishyplanet | No | Free | 5.6 |
Head-to-head All 28 comparisons →
- Stellarium vs KStars
- Stellarium vs WorldWide Telescope
- Stellarium vs SkyPortal
- Stellarium vs Star Walk 2
- Stellarium vs Sky Tonight
- Stellarium vs Heavens-Above
- Stellarium vs Solar System Scope
- KStars vs WorldWide Telescope
- KStars vs SkyPortal
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How we rank astronomy apps
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update