Life & fun · alternatives · 2026
24 alternatives to Solar Idle
A free, idol space game where you colonise a solar system
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Solar Idle launched in 2020; newer entries below may have overtaken it.
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I built this with Claude cause I always wanted to tinker with a simulation economoy and I love space themes. A space-economy sim where nothing is scripted. A few hundred autonomous ships each run their own planner. Some chase the best trade route, take a delivery contract, refuel, retrofit at a shipyard, or dock so the crew can rest before morale tanks. Markets price everything off supply with shortage-urgency multipliers, factions tax and subsidize, populations migrate when they're unhappy, and stations that go broke get abandoned and rot. It started as an Elixir/Phoenix prototype, but…
Jul 2026 · github.com · its alternatives →
- 3IC
I built a desktop Mars colony survival game called Underhill, in homage to Kim Stanley Robinson's Mars trilogy. Land on Mars, build solar panels and greenhouses, and try not to pass out during dust storms. Eventually your colonists split into factions: Greens who want to terraform and Reds who want to preserve Mars. There’s Chill Mode for players that just want to build & hang, and Conflict Mode that introduces the Red v. Green factions. Reds sabotage, the terrain slowly turns green as the world gets more terraformed. Feedback welcome, especially on performance and gameplay!
Feb 2026 · underhillgame.com · its alternatives →
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HelioPeak▲78Solar monitoring for pvoutput on every Apple device.
May 2026 · heliopeak.app · its alternatives →
- 10AS
I didn't realize Universe Sandbox ran on MacOS, and I was in the mood to play around a bit. Some functions it's got: - Random system generation - Sonification is super fun too - Habitability Simulation (Just for fun, don't cite this please) - Replacing, spawning, deleting objects I've had tons of fun building this, so I hope someone else can share the joy. It's free and runs in the browser. I'd love to hear any feedback. I think this is at a state where I might leave it as it is, but if people are interested in other features, maybe I'll keep working on it. I've kept saying I'll stop working…
Dec 2025 · luna.watermelonson.com · its alternatives →
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Playing cards based on solar system, science & exploration
2021 · its alternatives →
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Space Incremental game for iPhones and iPads
Jan 2026 · apps.apple.com · its alternatives →
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I ported a classic windows game to iOS, this time with Game Center leaderboards and a brand new portrait mode! 100% free, no ads!
2025 · apps.apple.com · its alternatives →
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Fun Causal Naval RTS In Space on iOS
2024 · supertinygamelabs.com · its alternatives →
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I made this little walkthrough for finding the visible planets tonight and a meteor shower shooting start counter. Plus a little model of the solar system to try to wrap my head around what's going on. It's all based on your location if you provide it. lifesprites.com/solar.html doesn't require account creation. The rest does. It's free, but you need an account.
29d ago · lifesprites.com · its alternatives →
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3D physics space puzzle — merge planets to reignite the Sun!
Jul 2026 · mergeplanets.promptlab.me · its alternatives →
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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 →