Free Space Sim Games on Steam
Steam currently has 966 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 5/17/2024.
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- Best space sim games on Steam
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1. Naval Action
Naval Action is a hardcore, realistic, and beautifully detailed naval combat sandbox immersing players into the experience of the most beautiful period of naval history - when sailing ships ruled the seas.
Naval Action holds the #1 spot for "best free Space Sim game on Steam" with a Player Score of 57. Its score was calculated by analyzing a total of 12,205 reviews on Steam. This breaks down to a total of 6,986 positive reviews and 5,219 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 Naval Action on the Steam Deck.
| Release Date | 6/13/2019 |
| Franchise | Game Labs, Inc |
| Developer | Game-Labs |
| Publisher | Game-Labs |
| Steam App Id | 311310 |
2. 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 73, placing it in the #2 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 14,567 reviews on Steam. This breaks down to a total of 10,757 positive reviews and 3,810 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 |
| Developer | Star Gem Inc. |
| Publishers | |
| Steam App Id | 212070 |
3. 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 53, placing it in the #3 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 652 reviews on Steam. This breaks down to a total of 350 positive reviews and 302 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 |
4. 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 #4 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 6,239 reviews on Steam. This breaks down to a total of 5,754 positive reviews and 485 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 |
5. 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 51, placing it in the #5 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 183 reviews on Steam. This breaks down to a total of 94 positive reviews and 89 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 |
6. Space Travel Idle
If you ever dreamed of exploring space at a relaxed pace, here's a journey designed for you.
Space Travel Idle has achieved a Player Score of 63, placing it in the #6 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 506 reviews on Steam. This breaks down to a total of 329 positive reviews and 177 negative reviews — making it "Mixed" on Steam.
It can be played and ran on both Windows and Mac systems. At the moment, it is possible to play Space Travel Idle on the Steam Deck (though some functionality may be limited).
| Release Date | 9/22/2020 |
| Developer | Ayatsuji_San |
| Publisher | Spaceive |
| Steam App Id | 1407860 |
7. Prosperous Universe
In Prosperous Universe start your galactic empire by trading on the real-time market exchange with other real players. Build your 1st base from humble beginnings & watch as your business flourishes with complex supply chain strategies. Economics, politics & realism fuel this immersive business MMO.
Prosperous Universe has achieved a Player Score of 71, placing it in the #7 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 705 reviews on Steam. This breaks down to a total of 525 positive reviews and 180 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on both Windows and Linux systems. At the moment, it is not possible to play or run Prosperous Universe on the Steam Deck.
| Release Date | 4/20/2022 |
| Developer | simulogics |
| Publisher | simulogics |
| Steam App Id | 1761220 |
8. Star Sonata 2
Star Sonata 2 is a space sandbox MMO that combines elements of action, RPG, and empire creation into a truly unique MMO. Explore the sandbox style universe, build persistent bases, construct trade ships, and even fight your way to the top and claim the Emperor’s Throne!
Star Sonata 2 has achieved a Player Score of 62, placing it in the #8 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 242 reviews on Steam. This breaks down to a total of 157 positive reviews and 85 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Star Sonata 2 on the Steam Deck (though some functionality may be limited).
| Release Date | 6/12/2020 |
| Developer | Landauer Games |
| Publisher | Landauer Games |
| Steam App Id | 304690 |
9. X3: Farnham's Legacy
X3: Farnham's Legacy is a new game in the X3 space game series. TRADE, FIGHT, BUILD, THINK in a living and breathing universe, which incorporates a new storyline and yet more additions to the open, free-form gameplay that forms the core of all X series games.
X3: Farnham's Legacy has achieved a Player Score of 81, placing it in the #9 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 558 reviews on Steam. This breaks down to a total of 485 positive reviews and 73 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on both Windows and Linux systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
10. Microsoft Allegiance
Allegiance is a team-based multiplayer space combat sim that seamlessly combines first-person space combat with a top-down-view perspective, real time strategy, and real time tactics. Team commanders build bases, research technology, and coordinate players to execute a wide range of strategies.
Microsoft Allegiance has achieved a Player Score of 73, placing it in the #10 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 167 reviews on Steam. This breaks down to a total of 132 positive reviews and 35 negative reviews — making it "Mostly Positive" 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 | 9/29/2017 |
| Developer | Microsoft Game Studios |
| Publisher | ZapHop Games |
| Steam App Id | 700480 |
More Free Space Sim Games
Explore even more rankings for the 100 best free Space Sim games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
 | 344 | 6/13/2019 | 57 | Free | Steam Charts | |
 | 192 | 2/27/2013 | 73 | Free | Steam Charts | |
 | 160 | 10/8/2021 | 53 | Free | Steam Charts | |
 | 100 | 10/30/2015 | 89 | Free | Steam Charts | |
 | 77 | 5/26/2022 | 51 | Free | Steam Charts | |
 | 65 | 9/22/2020 | 63 | Free | Steam Charts | |
 | 54 | 4/20/2022 | 71 | Free | Steam Charts | |
 | 33 | 6/12/2020 | 62 | Free | Steam Charts | |
 | 28 | 5/4/2021 | 81 | Free | Steam Charts | |
 | 20 | 9/29/2017 | 73 | Free | Steam Charts | |
 | 17 | 11/4/2020 | 65 | Free | Steam Charts | |
 | 15 | 2/12/2024 | 81 | Free | Steam Charts | |
 | 13 | 2/11/2024 | 83 | Free | Steam Charts | |
 | 12 | 3/31/2024 | 80 | Free | Steam Charts | |
 | 11 | 7/18/2023 | 82 | Free | Steam Charts | |
 | 8 | 5/26/2023 | 63 | Free | Steam Charts | |
 | 5 | 10/11/2018 | 73 | Free | Steam Charts | |
 | 4 | 1/22/2021 | 61 | Free | Steam Charts | |
 | 4 | 11/15/2016 | 44 | Free | Steam Charts | |
 | 4 | 8/21/2020 | 88 | 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. (2024, May 17). Steam Store. Steam Store.
- Valve Corporation. (2024, May 17). Naval Action on Steam. Steam Store.
- Valve Corporation. (2024, May 18). Star Conflict on Steam. Steam Store.
- Valve Corporation. (2024, April 25). Infinite Lagrange on Steam. Steam Store.
- Valve Corporation. (2024, March 3). Endless Sky on Steam. Steam Store.
- Valve Corporation. (2024, May 14). Nova Empire on Steam. Steam Store.
- Valve Corporation. (2024, May 13). Space Travel Idle on Steam. Steam Store.
- Valve Corporation. (2024, April 1). Prosperous Universe on Steam. Steam Store.
- Valve Corporation. (2024, May 11). Star Sonata 2 on Steam. Steam Store.
- Valve Corporation. (2024, May 4). X3: Farnham's Legacy on Steam. Steam Store.
- Valve Corporation. (2024, May 12). Microsoft Allegiance on Steam. Steam Store.