Free Space Sim Games on Steam
Steam currently has 1,103 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 12/14/2024.
Looking for more? Explore other lists such as:
- Best space sim games on Steam
- Best space sim Steam Deck games
- Best space sim Steam games for Mac OS
- Best space sim Linux games on Steam
- Free Steam games
- Most played Steam games
- Best rated Steam games
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 74. Its score was calculated by analyzing a total of 449 reviews on Steam. This breaks down to a total of 350 positive reviews and 99 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).
2. Idle Sphere
Stunning sphere-themed idle/incremental game. Experience simplicity's beauty.
Idle Sphere has achieved a Player Score of 62, placing it in the #2 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 141 reviews on Steam. This breaks down to a total of 93 positive reviews and 48 negative reviews — making it "Mixed" on Steam.
It can be played and ran on both Windows and Mac systems. At the moment, there is no confirmed information regarding Steam Deck support for this game.
| Release Date | 11/17/2024 |
| Developers | |
| Publisher | Idle System, Inc. |
| Steam App Id | 3217600 |
3. 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 has achieved a Player Score of 57, placing it in the #3 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 12,598 reviews on Steam. This breaks down to a total of 7,180 positive reviews and 5,418 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 |
4. 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 56, placing it in the #4 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 797 reviews on Steam. This breaks down to a total of 451 positive reviews and 346 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 |
5. 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 #5 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 14,725 reviews on Steam. This breaks down to a total of 10,830 positive reviews and 3,895 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 |
6. 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 #6 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 6,444 reviews on Steam. This breaks down to a total of 5,951 positive reviews and 493 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 |
7. 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 52, placing it in the #7 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 228 reviews on Steam. This breaks down to a total of 121 positive reviews and 107 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 |
8. 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 #8 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 28 reviews on Steam. This breaks down to a total of 14 positive reviews and 14 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 | 10/22/2024 |
| Developer | STONE3 PTE. LTD. |
| Publisher | STONE3 PTE. LTD. |
| Steam App Id | 1108270 |
9. 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 66, placing it in the #9 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 169 reviews on Steam. This breaks down to a total of 119 positive reviews and 50 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 | 10/14/2024 |
| Developer | Solid Clouds hf. |
| Publisher | Solid Clouds hf. |
| Steam App Id | 3021540 |
10. Astrometica: Prologue
Astrometica: Prologue is the free game about surviving in space. You need to use your skills and tools to stay alive. There are many challenges to face, and you need to fight to survive. You also need to build a new base in space.
Astrometica: Prologue has achieved a Player Score of 88, placing it in the #10 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 1,114 reviews on Steam. This breaks down to a total of 1,033 positive reviews and 81 negative reviews — making it "Very 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 | 5/22/2024 |
| Franchise | RockGame S.A. |
| Developer | BeryMery |
| Publisher | RockGame S.A. |
| Steam App Id | 2904320 |
More Free Space Sim Games
Explore even more rankings for the 100 best free Space Sim games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 1,549 | 7/18/2024 | 74 | Free | Steam Charts | |
| 730 | 11/17/2024 | 62 | Free | Steam Charts | |
| 310 | 6/13/2019 | 57 | Free | Steam Charts | |
| 176 | 10/8/2021 | 56 | Free | Steam Charts | |
| 146 | 2/27/2013 | 72 | Free | Steam Charts | |
| 89 | 10/30/2015 | 89 | Free | Steam Charts | |
| 89 | 5/26/2022 | 52 | Free | Steam Charts | |
| 84 | 10/22/2024 | 50 | Free | Steam Charts | |
| 67 | 10/14/2024 | 66 | Free | Steam Charts | |
| 62 | 5/22/2024 | 88 | Free | Steam Charts | |
 | 60 | 5/4/2021 | 81 | Free | Steam Charts | |
 | 47 | 9/22/2020 | 62 | Free | Steam Charts | |
 | 26 | 4/20/2022 | 71 | Free | Steam Charts | |
 | 25 | 9/25/2024 | 77 | Free | Steam Charts | |
 | 21 | 6/12/2020 | 64 | Free | Steam Charts | |
 | 12 | 9/29/2017 | 73 | Free | Steam Charts | |
 | 11 | 2/11/2024 | 83 | Free | Steam Charts | |
 | 11 | 11/4/2020 | 65 | Free | Steam Charts | |
 | 11 | 8/7/2024 | 59 | Free | Steam Charts | |
 | 10 | 2/24/2023 | 52 | 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, December 14). Steam Store. Steam Store.
- Valve Corporation. (2024, December 14). Galaxy Idle Clicker on Steam. Steam Store.
- Valve Corporation. (2024, December 12). Idle Sphere on Steam. Steam Store.
- Valve Corporation. (2024, December 13). Naval Action on Steam. Steam Store.
- Valve Corporation. (2024, November 9). Infinite Lagrange on Steam. Steam Store.
- Valve Corporation. (2024, December 13). Star Conflict on Steam. Steam Store.
- Valve Corporation. (2024, October 26). Endless Sky on Steam. Steam Store.
- Valve Corporation. (2024, December 3). Nova Empire on Steam. Steam Store.
- Valve Corporation. (2024, December 13). Nova: Space Armada on Steam. Steam Store.
- Valve Corporation. (2024, December 14). Starborne: Frontiers on Steam. Steam Store.
- Valve Corporation. (2024, December 12). Astrometica: Prologue on Steam. Steam Store.