Free Space Sim Games on Steam

Steam currently has 1,095 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 12/1/2024.

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 73. Its score was calculated by analyzing a total of 429 reviews on Steam. This breaks down to a total of 332 positive reviews and 97 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 66, placing it in the #2 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 84 reviews on Steam. This breaks down to a total of 60 positive reviews and 24 negative reviews — making it "Mostly Positive" 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 55, placing it in the #4 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 788 reviews on Steam. This breaks down to a total of 443 positive reviews and 345 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 14,716 reviews on Steam. This breaks down to a total of 10,826 positive reviews and 3,890 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. 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 #6 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 153 reviews on Steam. This breaks down to a total of 108 positive reviews and 45 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

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 226 reviews on Steam. This breaks down to a total of 120 positive reviews and 106 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. 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 #8 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 6,439 reviews on Steam. This breaks down to a total of 5,946 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

9. 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 49, placing it in the #9 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 25 reviews on Steam. This breaks down to a total of 12 positive reviews and 13 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

10. Kepler-2100

Kepler-2100 is a space fantasy strategy war game

Kepler-2100 banner

Kepler-2100 has achieved a Player Score of 78, placing it in the #10 spot for the best free Space Sim games. Its score was calculated by analyzing a total of 418 reviews on Steam. This breaks down to a total of 348 positive reviews and 70 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 9/25/2024
Developer NCARD
Publisher NCARD
Steam App Id 2758490

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
1,737
7/18/2024
73
Free
Steam Charts
Idle Sphere steam charts
877
11/17/2024
66
Free
Steam Charts
Naval Action steam charts
266
6/13/2019
57
Free
Steam Charts
Infinite Lagrange steam charts
174
10/8/2021
55
Free
Steam Charts
Star Conflict steam charts
117
2/27/2013
72
Free
Steam Charts
Starborne: Frontiers steam charts
81
10/14/2024
66
Free
Steam Charts
Nova Empire steam charts
77
5/26/2022
52
Free
Steam Charts
Endless Sky steam charts
67
10/30/2015
89
Free
Steam Charts
Nova: Space Armada steam charts
60
10/22/2024
49
Free
Steam Charts
Kepler-2100 steam charts
56
9/25/2024
78
Free
Steam Charts
Space Travel Idle steam charts
54
9/22/2020
62
Free
Steam Charts
X3: Farnham's Legacy steam charts
33
5/4/2021
81
Free
Steam Charts
Prosperous Universe steam charts
31
4/20/2022
72
Free
Steam Charts
Sputnika Game steam charts
16
2/11/2024
83
Free
Steam Charts
Star Sonata 2 steam charts
16
6/12/2020
64
Free
Steam Charts
Astrometica: Prologue steam charts
12
5/22/2024
88
Free
Steam Charts
Space Miner - Idle Adventures steam charts
9
11/8/2024
47
Free
Steam Charts
Andromeda: Rebirth of Humanity steam charts
7
1/22/2021
61
Free
Steam Charts
Shattered Void steam charts
7
8/7/2024
57
Free
Steam Charts
SpaceInvasion steam charts
6
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 1). Steam Store. Steam Store.
  • Valve Corporation. (2024, December 1). Galaxy Idle Clicker on Steam. Steam Store.
  • Valve Corporation. (2024, December 2). Idle Sphere on Steam. Steam Store.
  • Valve Corporation. (2024, November 29). Naval Action on Steam. Steam Store.
  • Valve Corporation. (2024, November 9). Infinite Lagrange on Steam. Steam Store.
  • Valve Corporation. (2024, December 2). Star Conflict on Steam. Steam Store.
  • Valve Corporation. (2024, December 2). Starborne: Frontiers on Steam. Steam Store.
  • Valve Corporation. (2024, November 28). Nova Empire on Steam. Steam Store.
  • Valve Corporation. (2024, October 26). Endless Sky on Steam. Steam Store.
  • Valve Corporation. (2024, December 2). Nova: Space Armada on Steam. Steam Store.
  • Valve Corporation. (2024, October 26). Kepler-2100 on Steam. Steam Store.

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