Life & fun · alternatives · 2026

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. GravityKit – Build and share your own planetary system launched in 2015; newer entries below may have overtaken it.

1. 1
   PixelSpace▲68

   A tediously accurate scale model of the solar system

   2014 · joshworth.com · its alternatives →

2. 2
   Gravity 8▲212

   Build a SaaS app at warp speed with a Javascript boilerplate

   2021 · usegravity.app · its alternatives →

3. 3
   Rover▲116

   iBeacon platform and open source SDK

   2014 · dev.roverlabs.co · its alternatives →

4. 4MP
   MARS – Personal AI robot for builders (< $2k)▲123

   Hey, we’re Axel and Vignesh, cofounders of Innate (https:&#x2F;&#x2F;www.innate.bot&#x2F;). We just launched MARS, a general-purpose robot with an open onboard agentic OS built on top of ROS2. Overview: https:&#x2F;&#x2F;youtu.be&#x2F;GEOMYDXv6pE Control demo: https:&#x2F;&#x2F;youtu.be&#x2F;_Cw5fGa8i3s Videos of autonomous use-cases: https:&#x2F;&#x2F;docs.innate.bot&#x2F;welcome&#x2F;mars-example-use-cases Quickstart: https:&#x2F;&#x2F;docs.innate.bot&#x2F;welcome&#x2F;mars-quick-start. Our last thread: https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=42451707 When we started we felt…

   2025 · its alternatives →

5. 5
   0RBITALIS▲60

   An abstract gravitational puzzler

   2015 · 0rbitalis.com · its alternatives →

6. 6
   Astrojump▲67

   A game about gravity and asteroids

   2014 · apps.apple.com · its alternatives →

7. 7IB
   I built a gravity simulator in pure CSS▲64

   2022 · multiplanetary.website · its alternatives →

8. 8
   Growthkit By Paddle▲134

   Free tools to grow your iOS & Mac Apps

   2015 · paddle.com · its alternatives →

9. 9
   KerbalX▲56

   Kerbal Space Program Craft Sharing

   2015 · kerbalx.com · its alternatives →

10. 10
    Recode Replay - Elon Musk▲140

    From colonizing Mars to "are we living in a simulation?"

    2016 · rss.art19.com · its alternatives →

11. 11
    Timekit▲97

    A comprehensive scheduling API (pre-launch)

    2014 · timekit.io · its alternatives →

12. 12
    Black Hole Joyrider▲60

    Guide your spacecraft through the gravity

    2016 · ianmaclarty.com · its alternatives →

13. 13
    SPACEPLAN▲73

    Work on your spaceship while doing other stuff

    2016 · jhollands.co.uk · its alternatives →

14. 14
    AstroGrid▲113

    Explore the entire universe in your browser, in real 3D

    Apr 2026 · velonspace.com · its alternatives →

15. 15
    OpenMCT by NASA▲86

    A web based mission control framework

    2016 · nasa.github.io · its alternatives →

16. 16
    gravity.js - Beta▲112

    Gravity WebGL experiment in the Solar System

    2016 · github.com · its alternatives →

17. 17
    Gravity – Kubernetes snapshots for on-premise deployments▲70

    Kubernetes application deployments for restricted, regulated, or remote environments - gravitational/gravity

    2018 · github.com · its alternatives →

18. 18
    Runtastic Orbit▲61

    Transform your goals into results

    2014 · runtastic.com · its alternatives →

19. 19
    Gravity▲29

    Build a SaaS web application at warp speed

    2019 · usegravity.app · its alternatives →

20. 20
    Galaxy Alliance▲56

    Find another habitable planet and rebuild your nation

    2015 · apps.apple.com · its alternatives →

21. 21
    Spaceteam▲93

    Command a spaceship with your friends

    2014 · spaceteam.ca · its alternatives →

22. 22
    Mars Colonies▲67

    A free old-school RTS... on Mars

    2015 · newgrounds.com · its alternatives →

23. 23
    BareKit▲65

    Wonderfully naked Front-End Project Starter

    2014 · a2labs.github.io · its alternatives →

24. 24
    Space Legacy▲69

    New Space Adventure from the creators of HOOP

    2016 · play.google.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →