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:

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 banner

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).

Release Date 7/18/2024
Developer Soehnle
Publisher Soehnle
Steam App Id 2962810

2. Idle Sphere

Stunning sphere-themed idle/incremental game. Experience simplicity's beauty.

Idle Sphere banner

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

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 banner

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 banner

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 banner

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 banner

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 banner

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 banner

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 banner

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.

ImageName
Actions
Galaxy Idle Clicker steam charts
1,549
7/18/2024
74
Free
Steam Charts
Idle Sphere steam charts
730
11/17/2024
62
Free
Steam Charts
Naval Action steam charts
310
6/13/2019
57
Free
Steam Charts
Infinite Lagrange steam charts
176
10/8/2021
56
Free
Steam Charts
Star Conflict steam charts
146
2/27/2013
72
Free
Steam Charts
Endless Sky steam charts
89
10/30/2015
89
Free
Steam Charts
Nova Empire steam charts
89
5/26/2022
52
Free
Steam Charts
Nova: Space Armada steam charts
84
10/22/2024
50
Free
Steam Charts
Starborne: Frontiers steam charts
67
10/14/2024
66
Free
Steam Charts
Astrometica: Prologue steam charts
62
5/22/2024
88
Free
Steam Charts
X3: Farnham's Legacy steam charts
60
5/4/2021
81
Free
Steam Charts
Space Travel Idle steam charts
47
9/22/2020
62
Free
Steam Charts
Prosperous Universe steam charts
26
4/20/2022
71
Free
Steam Charts
Kepler-2100 steam charts
25
9/25/2024
77
Free
Steam Charts
Star Sonata 2 steam charts
21
6/12/2020
64
Free
Steam Charts
Microsoft Allegiance steam charts
12
9/29/2017
73
Free
Steam Charts
Sputnika Game steam charts
11
2/11/2024
83
Free
Steam Charts
Space Commander: War and Trade steam charts
11
11/4/2020
65
Free
Steam Charts
Shattered Void steam charts
11
8/7/2024
59
Free
Steam Charts
SpaceInvasion steam charts
10
2/24/2023
52
Free
Steam Charts
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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.

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