Free Space Sim Games on Steam
Steam currently has 1,250 Space Sim games available to download and play. Explore our list of the best free games ranked by popularity and ratings. Data for this list is calculated from reviews and player counts reported directly by Steam and will be updated in real-time. Free Space Sim game rankings were last updated on 7/29/2025.
Looking for more? Explore other lists such as:
- Best space sim games on Steam
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1. Galaxy Idle Clicker
Embark on an interstellar journey with Galaxy Idle Clicker! Conquer galaxies, upgrade your spaceship, and face off against a myriad of enemy ships. With engaging minigames, powerful upgrades, GIC delivers an unparalleled idle space adventure. Join the cosmic conquest today and dominate the universe!

Galaxy Idle Clicker holds the #1 spot for "best free Space Sim game on Steam" with a Player Score of 72. Its score was calculated by analyzing a total of 705 reviews on Steam. This breaks down to a total of 529 positive reviews and 176 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Galaxy Idle Clicker on the Steam Deck (though some functionality may be limited).
Release Date | 7/18/2024 |
Developer | Soehnle |
Publishers | |
Steam App Id | 2962810 |
3. Pixel Starships
Pixel Starships is an FTL-style online sci-fi strategy builder and management game with a competitive PVP tournament. Set in the retro galaxy, your role is to explore space, meet aliens, and develop your ship, crew and AI. The game contains deep strategic and 4x elements. PSS is community-driven.

Pixel Starships has achieved a Player Score of 71, placing it in the #3 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 2,764 reviews on Steam. This breaks down to a total of 2,030 positive reviews and 734 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. Valve has also verified it as playable on the Steam Deck and will run well.
4. Idle Sphere
Stunning sphere-themed idle/incremental game. Experience simplicity's beauty.

Idle Sphere has achieved a Player Score of 52, placing it in the #4 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 271 reviews on Steam. This breaks down to a total of 141 positive reviews and 130 negative reviews — making it "Mixed" on Steam.
It can be played and ran on both Windows and Mac systems. At the moment, it is not possible to play or run Idle Sphere on the Steam Deck.
Release Date | 11/17/2024 |
Developers | |
Publisher | Idle System, Inc. |
Steam App Id | 3217600 |
5. Infinite Lagrange
Different forces strive to make their own way in the space and desire the control of the Lagrange system- a gigantic transportation network. You, emerging as one of the force leaders, find yourself in a time of challenges and opportunities.

Infinite Lagrange has achieved a Player Score of 55, placing it in the #5 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 916 reviews on Steam. This breaks down to a total of 511 positive reviews and 405 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run Infinite Lagrange on the Steam Deck.
Release Date | 10/8/2021 |
Developer | NetEase Games |
Publisher | NetEase Games |
Steam App Id | 1755920 |
6. Nova: Space Armada
An exceptional sci-fi strategy game based on space adventure as its core.

Nova: Space Armada has achieved a Player Score of 50, placing it in the #6 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 127 reviews on Steam. This breaks down to a total of 64 positive reviews and 63 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Nova: Space Armada on the Steam Deck (though some functionality may be limited).
Release Date | 10/22/2024 |
Developer | STONE3 PTE. LTD. |
Publisher | STONE3 PTE. LTD. |
Steam App Id | 1108270 |
7. Endless Sky
Endless Sky is a 2D space trading and combat game inspired by the classic Escape Velocity series. Work your way up from a relatively wimpy shuttle, cargo ship, or fighter, to a highly upgraded and customized flagship or to a massive fleet of warships or freighters.

Endless Sky has achieved a Player Score of 89, placing it in the #7 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 6,700 reviews on Steam. This breaks down to a total of 6,187 positive reviews and 513 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Endless Sky on the Steam Deck (though some functionality may be limited).
Release Date | 10/30/2015 |
Developer | Michael Zahniser |
Publisher | Michael Zahniser |
Steam App Id | 404410 |
8. Star Conflict
Star Conflict is an action-packed, massively multiplayer space simulation game that puts players in the role of elite pilots engaging in a widespread interplanetary skirmish. The whole world for PVP and PVE!

Star Conflict has achieved a Player Score of 72, placing it in the #8 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 14,893 reviews on Steam. This breaks down to a total of 10,881 positive reviews and 4,012 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play Star Conflict on the Steam Deck (though some functionality may be limited).
Release Date | 2/27/2013 |
Franchise | Gaijin Network Ltd |
Developer | Star Gem Inc. |
Publishers | |
Steam App Id | 212070 |
9. Nova Empire
Build up a Space Empire and establish control of the Galaxy and the Universe! Nova Empire is a multiplayer space game in which the aim is to build your empire and conquer the galaxy in epic space battles against your rivals with other allies worldwide!

Nova Empire has achieved a Player Score of 54, placing it in the #9 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 258 reviews on Steam. This breaks down to a total of 141 positive reviews and 117 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
Release Date | 5/26/2022 |
Developer | Gamebear Tech |
Publisher | Gamebear Tech |
Steam App Id | 1962770 |
10. Starborne: Frontiers
Starborne: Frontiers is a free-to-play tactical autobattler with hundreds of unique ships. Form your fleet, customize it with a variety of equipment, and use strategy to create the perfect battlefield formation. Take on bounties, engage in the PvP arena, and bring order to the Frontier.

Starborne: Frontiers has achieved a Player Score of 65, placing it in the #10 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 254 reviews on Steam. This breaks down to a total of 173 positive reviews and 81 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
Release Date | 10/14/2024 |
Developer | Solid Clouds hf. |
Publisher | Solid Clouds hf. |
Steam App Id | 3021540 |
More Free Space Sim Games
Explore even more rankings for the 100 best free Space Sim games available on Steam.
Image | Name | Actions | ||||
---|---|---|---|---|---|---|
788 | 7/18/2024 | 72 | Free | Steam Charts | ||
312 | 6/13/2019 | 54 | Free | Steam Charts | ||
180 | 5/23/2023 | 71 | Free | Steam Charts | ||
98 | 11/17/2024 | 52 | Free | Steam Charts | ||
98 | 10/8/2021 | 55 | Free | Steam Charts | ||
97 | 10/22/2024 | 50 | Free | Steam Charts | ||
92 | 10/30/2015 | 89 | Free | Steam Charts | ||
59 | 2/27/2013 | 72 | Free | Steam Charts | ||
38 | 5/26/2022 | 54 | Free | Steam Charts | ||
30 | 10/14/2024 | 65 | Free | Steam Charts | ||
29 | 9/22/2020 | 61 | Free | Steam Charts | ||
23 | 5/4/2021 | 81 | Free | Steam Charts | ||
18 | 4/20/2022 | 72 | Free | Steam Charts | ||
17 | 6/12/2020 | 64 | Free | Steam Charts | ||
15 | 7/18/2024 | 50 | Free | Steam Charts | ||
8 | 2/11/2024 | 84 | Free | Steam Charts | ||
4 | 10/11/2018 | 73 | Free | Steam Charts | ||
4 | 2/7/2022 | 77 | Free | Steam Charts | ||
3 | 5/24/2022 | 75 | Free | Steam Charts | ||
3 | 7/17/2023 | 54 | Free | Steam Charts |
Soures & References
Steambase has best-in-class data powered directly by Steam, our data partners, and in-house experts. Player counts and rankings are enriched, analyzed, and updated in real-time to ensure we surface the most up-to-date insights. Learn more about the Steambase approach to data collection and our review methodology.
- Valve Corporation. (2025, July 29). Steam Store. Steam Store.
- Valve Corporation. (2025, July 29). Galaxy Idle Clicker on Steam. Steam Store.
- Valve Corporation. (2025, July 30). Naval Action on Steam. Steam Store.
- Valve Corporation. (2025, July 29). Pixel Starships on Steam. Steam Store.
- Valve Corporation. (2025, July 19). Idle Sphere on Steam. Steam Store.
- Valve Corporation. (2025, July 21). Infinite Lagrange on Steam. Steam Store.
- Valve Corporation. (2025, July 22). Nova: Space Armada on Steam. Steam Store.
- Valve Corporation. (2025, June 28). Endless Sky on Steam. Steam Store.
- Valve Corporation. (2025, July 25). Star Conflict on Steam. Steam Store.
- Valve Corporation. (2025, July 18). Nova Empire on Steam. Steam Store.
- Valve Corporation. (2025, July 25). Starborne: Frontiers on Steam. Steam Store.