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:

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 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 banner

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.

Release Date 5/23/2023
Developer SavySoda
Publisher SavySoda
Steam App Id 378760

4. Idle Sphere

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

Idle Sphere banner

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.

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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 banner

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 banner

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 banner

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 banner

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 banner

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.

ImageName
Actions
Galaxy Idle Clicker steam charts
788
7/18/2024
72
Free
Steam Charts
Naval Action steam charts
312
6/13/2019
54
Free
Steam Charts
Pixel Starships steam charts
180
5/23/2023
71
Free
Steam Charts
Idle Sphere steam charts
98
11/17/2024
52
Free
Steam Charts
Infinite Lagrange steam charts
98
10/8/2021
55
Free
Steam Charts
Nova: Space Armada steam charts
97
10/22/2024
50
Free
Steam Charts
Endless Sky steam charts
92
10/30/2015
89
Free
Steam Charts
Star Conflict steam charts
59
2/27/2013
72
Free
Steam Charts
Nova Empire steam charts
38
5/26/2022
54
Free
Steam Charts
Starborne: Frontiers steam charts
30
10/14/2024
65
Free
Steam Charts
Space Travel Idle steam charts
29
9/22/2020
61
Free
Steam Charts
X3: Farnham's Legacy steam charts
23
5/4/2021
81
Free
Steam Charts
Prosperous Universe steam charts
18
4/20/2022
72
Free
Steam Charts
Star Sonata 2 steam charts
17
6/12/2020
64
Free
Steam Charts
Pizza Clicker steam charts
15
7/18/2024
50
Free
Steam Charts
Sputnika Game steam charts
8
2/11/2024
84
Free
Steam Charts
Helium Rain steam charts
4
10/11/2018
73
Free
Steam Charts
Spacelines from the Far Out: Flight School steam charts
4
2/7/2022
77
Free
Steam Charts
Fly Dangerous steam charts
3
5/24/2022
75
Free
Steam Charts
Clash of Stars steam charts
3
7/17/2023
54
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. (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.

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