Freedom251
For vendors
AdvertiseTop spots, featured rows, home sponsor Get listedAdd a product we don't cover yet Claim a listingFree: verify the domain, then correct your page Vendor dashboardNumbers, orders and placements
Vendor dashboard

Best OpenSpace Alternatives in 2026

Updated

20 apps from astronomy apps ranked against OpenSpace on the same published basis.

  1. 1
    NASA Eyes Free plan AndroidiOSLinuxMacWeb Free6.8
    OpenSpace vs NASA Eyes
  2. 2
    Celestia Free plan AndroidiOSLinuxMacWeb Free6.7
    OpenSpace vs Celestia
  3. 3
    Solar System Scope Free plan AndroidiOSMacWebWin Free6.7
    OpenSpace vs Solar System Scope
  4. 4
    Cosmic Watch Free plan AndroidiOSMac $0.42/mo6.6
    OpenSpace vs Cosmic Watch
  5. 5
    Night Sky Free plan AndroidiOSMac Free6.6
    OpenSpace vs Night Sky
  6. 6
    Star Chart Free plan AndroidiOSMacWin Free6.6
    OpenSpace vs Star Chart
  7. 7
    Star Chart Free plan AndroidiOSMacWin Free6.6
    OpenSpace vs Star Chart
  8. 8
    Stellarium Free plan LinuxMacWebWin Free6.6
    OpenSpace vs Stellarium
  9. 9
    DWARFLAB App Free plan AndroidiOS Free6.5
    OpenSpace vs DWARFLAB App
  10. 10
    Gaia Sky Free plan LinuxMacWin Free6.5
    OpenSpace vs Gaia Sky
  11. 11
    KStars Free plan LinuxMacWin Free6.5
    OpenSpace vs KStars
  12. 12
    Singularity Free plan AndroidiOS Free6.5
    OpenSpace vs Singularity
  13. 13
    Star Walk 2 Free plan AndroidiOS $0.50/mo6.5
    OpenSpace vs Star Walk 2
  14. 14
    SkyPortal Free plan AndroidiOS Free6.4
    OpenSpace vs SkyPortal
  15. 15
    Spacecraft AR Free plan AndroidiOS Free6.4
    OpenSpace vs Spacecraft AR
  16. 16
    Spot the Station Free plan AndroidiOS Free6.4
    OpenSpace vs Spot the Station
  17. 17
    squishyplanet Free plan LinuxWin Free6.4
    OpenSpace vs squishyplanet
  18. 18
    Starmap Free plan iOSMac Free6.4
    OpenSpace vs Starmap
  19. 19
    WorldWide Telescope Free plan apiWebWin Free6.4
    OpenSpace vs WorldWide Telescope
  20. 20
    BXA Free plan Linux Free6.3
    OpenSpace vs BXA

OpenSpace alternatives compared

#AppScoreFree planFromRuns on
1NASA Eyes6.8Free planFreeAndroid, iOS, Linux, Mac, Web, Windows
2Celestia6.7Free planFreeAndroid, iOS, Linux, Mac, Web, Windows
3Solar System Scope6.7Free planFreeAndroid, iOS, Mac, Web, Windows
4Cosmic Watch6.6Free plan$0.42/moAndroid, iOS, Mac
5Night Sky6.6Free planFreeAndroid, iOS, Mac
6Star Chart6.6Free planFreeAndroid, iOS, Mac, Windows
7Star Chart6.6Free planFreeAndroid, iOS, Mac, Windows
8Stellarium6.6Free planFreeLinux, Mac, Web, Windows
9DWARFLAB App6.5Free planFreeAndroid, iOS
10Gaia Sky6.5Free planFreeLinux, Mac, Windows
11KStars6.5Free planFreeLinux, Mac, Windows
12Singularity6.5Free planFreeAndroid, iOS
13Star Walk 26.5Free plan$0.50/moAndroid, iOS
14SkyPortal6.4Free planFreeAndroid, iOS
15Spacecraft AR6.4Free planFreeAndroid, iOS
16Spot the Station6.4Free planFreeAndroid, iOS
17squishyplanet6.4Free planFreeLinux, Windows
18Starmap6.4Free planFreeiOS, Mac
19WorldWide Telescope6.4Free planFreeAPI, Web, Windows
20BXA6.3Free planFreeLinux
Make your app an alternative to OpenSpace

The sponsored alternative slot on this page is labelled Sponsored.

See the price

Questions about OpenSpace alternatives

What is the best alternative to OpenSpace?

NASA Eyes, number 1 in astronomy apps with a score of 6.8 out of 10. The others here: Celestia, Solar System Scope, Cosmic Watch and 16 more.

What is the best free alternative to OpenSpace?

NASA Eyes is the best-ranked alternative with a free plan. 20 of the 20 alternatives here publish a free plan on their own pricing pages.

How are these alternatives ranked?

Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.