Free to Play Sci-fi Games on Steam
Check out this fantastic list of free-to-play sci-fi games you can enjoy on Steam right now, updated on November 01st 2025. Looking for even more free titles? Explore the complete list of the best free to play sci-fi games.
Lists & Categories
1. Star Trek Online
In Star Trek Online, the Star Trek universe appears for the first time on a truly massive scale. Players take the captain's chair as they command their own starship and crew. Explore strange new worlds, seek out new life and new civilizations, and boldly go where no one has gone before. Star Trek Online is a game developed and published by . Released on January 31st 2012 has received 20,145 reviews of which 15,939 were positive and 4,206 were negative resulting in a rating of 7.8 out of 10. The game has hit the top spot as the #1 most played sci-fi game, thanks to its 1,014 peak concurrent players over the last day.
7.8
15,939
4,206
1,014
players
2. 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 is a game developed and published by . Released on October 30th 2015 has received 6,651 reviews of which 6,141 were positive and 510 were negative resulting in a rating of 8.9 out of 10. While seeing 162 players online at once in the last 24 hours, this game is currently ranked #2 among sci-fi games based on player count.
8.9
6,141
510
162
players
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 is a game developed and published by . Released on May 23rd 2023 has received 2,732 reviews of which 2,008 were positive and 724 were negative resulting in a rating of 7.1 out of 10. While seeing 134 players online at once in the last 24 hours, this game is currently ranked #3 among sci-fi games based on player count.
7.1
2,008
724
134
players
4. Hades' Star
A unique space strategy game where thousands of players participate in one shared galaxy. Hades' Star is a game developed and published by . Released on February 27th 2019 has received 2,577 reviews of which 1,874 were positive and 703 were negative resulting in a rating of 7.1 out of 10. With 103 concurrent players in the last 24 hours, the game currently holds the #4 spot among the most played sci-fi games.
7.1
1,874
703
103
players
5. Space Pilgrim Episode III: Delta Pavonis
Still reeling from the life-changing events of the previous episode, Gail seeks out a safe haven with her father in the Delta Pavonis system. However, she soon learns that the politics of Planet Leto can be as treacherous and unpredictable as the local weather. Space Pilgrim Episode III: Delta Pavonis is a game developed and published by . Released on February 04th 2016 has received 425 reviews of which 369 were positive and 56 were negative resulting in a rating of 8.1 out of 10. The game currently holds the #5 spot among the most played sci-fi games.
8.1
369
56
51
players
6. 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 is a game developed and published by . Released on April 20th 2022 has received 934 reviews of which 703 were positive and 231 were negative resulting in a rating of 7.2 out of 10. The game currently holds the #6 spot among the most played sci-fi games.
7.2
703
231
23
players
7. Buy a Croquette!
March 2012, Nagano. The brave and clever high school girl, Chio Aozora, is facing a major crisis: she doesn’t have enough money to buy a croquette! Navigate through the streets and alleys of Nagano, interact with a variety of characters, solve complex puzzles, collect 380 yen, and buy a croquette! Buy a Croquette! is a game developed and published by . Released on April 27th 2024 has received 4,397 reviews of which 4,355 were positive and 42 were negative resulting in an impressive rating of 9.5 out of 10. The game currently holds the #7 spot among the most played sci-fi games.
9.5
4,355
42
14
players
8. Space Pilgrim Episode I: Alpha Centauri
Captain Gail Pilgrim has been flying starships since she was a kid, ferrying passengers between planets and space stations across the galaxy. She has no reason to expect that this latest trip to Alpha Centauri will be anything special, even if her passengers are a little more diverse than usual.... Space Pilgrim Episode I: Alpha Centauri is a game developed and published by . Released on December 21st 2015 has received 1,250 reviews of which 1,101 were positive and 149 were negative resulting in a rating of 8.4 out of 10. The game currently holds the #8 spot among the most played sci-fi games.
8.4
1,101
149
3
players
9. Terraformers: First Steps on Mars
Terraformers: First Steps on Mars is a free prologue of Terraformers, featuring an exclusive challenge to lead humanity's first attempt at settling the Red Planet. Terraformers: First Steps on Mars is a game developed and published by . Released on October 23rd 2021 has received 688 reviews of which 612 were positive and 76 were negative resulting in a rating of 8.4 out of 10. The game currently holds the #9 spot among the most played sci-fi games.
8.4
612
76
3
players
10. Star Wars: Droid Repair Bay
In Star Wars: Droid Repair Bay by ILMxLAB, Poe Dameron's sidekick needs your help. Repair BB-8 and his astromech droid friends, each with their own unique personalities, so they can roll back into the fight against the First Order. Star Wars: Droid Repair Bay is a game developed and published by . Released on December 06th 2017 has received 539 reviews of which 484 were positive and 55 were negative resulting in a rating of 8.4 out of 10. The game currently holds the #10 spot among the most played sci-fi games.
8.4
484
55
2
players
More Sci-fi & Related Games
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