Free Sci-fi Games on Steam
Steam currently has 14,958 Sci-fi 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 Sci-fi game rankings were last updated on 5/13/2026.
Looking for more? Explore other lists such as:
- Best sci-fi games on Steam
- Best sci-fi Steam Deck games
- Best sci-fi Steam games for Mac OS
- Best sci-fi Linux games on Steam
- Free Steam games
- Most played Steam games
- Best rated Steam games
1. Apex Legends™
Apex Legends is the award-winning, free-to-play Hero Shooter from Respawn Entertainment. Master an ever-growing roster of legendary characters with powerful abilities, and experience strategic squad play and innovative gameplay in the next evolution of Hero Shooter and Battle Royale.
Apex Legends™ holds the #1 spot for "best free Sci-fi game on Steam" with a Player Score of 67. Its score was calculated by analyzing a total of 1,047,429 reviews on Steam. This breaks down to a total of 708,604 positive reviews and 338,825 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 Apex Legends™ on the Steam Deck.
| Release Date | 11/5/2020 |
| Franchise | Apex Legends Official |
| Developers | |
| Publisher | Electronic Arts |
| Steam App Id | 1172470 |
2. Marvel Rivals
Marvel Rivals is a Super Hero Team-Based PVP Shooter! Assemble an all-star Marvel squad, devise countless strategies by combining powers to form unique Team-Up skills and fight in destructible, ever-changing battlefields across the continually evolving Marvel universe!
Marvel Rivals has achieved a Player Score of 76, placing it in the #2 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 386,607 reviews on Steam. This breaks down to a total of 296,086 positive reviews and 90,521 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 Marvel Rivals on the Steam Deck (though some functionality may be limited).
| Release Date | 12/5/2024 |
| Developer | NetEase Games |
| Publisher | NetEase Games |
| Steam App Id | 2767030 |
3. Limbus Company
As the Executive Manager of Limbus Company, lead your group of twelve Sinners, venture into the buried facilities of Lobotomy Corporation, and lay claim on the Golden Boughs.
Limbus Company has achieved a Player Score of 86, placing it in the #3 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 104,872 reviews on Steam. This breaks down to a total of 91,915 positive reviews and 12,957 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Limbus Company on the Steam Deck (though some functionality may be limited).
| Release Date | 2/26/2023 |
| Developer | ProjectMoon |
| Publisher | ProjectMoon |
| Steam App Id | 1973530 |
4. Warframe
Awaken as an unstoppable warrior and battle alongside your friends in this story-driven free-to-play online action game
Warframe has achieved a Player Score of 87, placing it in the #4 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 662,044 reviews on Steam. This breaks down to a total of 580,654 positive reviews and 81,390 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on Windows systems. Valve has also verified it as playable on the Steam Deck and will run well.
| Release Date | 3/25/2013 |
| Franchise | Digital Extremes Ltd. |
| Developer | Digital Extremes |
| Publisher | Digital Extremes |
| Steam App Id | 230410 |
5. Overwatch®
Overwatch®, A FUTURE WORTH FIGHTING FOR! Overwatch® is an always-on and ever-evolving free-to-play, team-based action game set in an optimistic future, where every match is the ultimate 5v5 or 6v6 battlefield brawl.
Overwatch® has achieved a Player Score of 30, placing it in the #5 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 399,855 reviews on Steam. This breaks down to a total of 119,613 positive reviews and 280,242 negative reviews — making it "Mostly Negative" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Overwatch® on the Steam Deck (though some functionality may be limited).
| Release Date | 8/10/2023 |
| Franchise | Blizzard |
| Developer | Blizzard Entertainment, Inc. |
| Publisher | Blizzard Entertainment, Inc. |
| Steam App Id | 2357570 |
6. OBS Studio
Free and open-source software for video recording and live streaming
OBS Studio has achieved a Player Score of 94, placing it in the #6 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 51,634 reviews on Steam. This breaks down to a total of 49,175 positive reviews and 2,459 negative reviews — making it "Overwhelmingly Positive" 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 OBS Studio on the Steam Deck.
| Release Date | 3/21/2022 |
| Developer | OBS Project |
| Publisher | OBS Project |
| Steam App Id | 1905180 |
7. Destiny 2
Destiny 2 is an action MMO with a single evolving world that you and your friends can join anytime, anywhere, absolutely free.
Destiny 2 has achieved a Player Score of 77, placing it in the #7 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 646,117 reviews on Steam. This breaks down to a total of 499,089 positive reviews and 147,028 negative reviews — making it "Mostly Positive" on Steam.
It can be played and ran on Windows systems. At the moment, it is not possible to play or run Destiny 2 on the Steam Deck.
8. Cell to Singularity - Evolution Never Ends
The epic story of evolution, technology, humanity, and dinosaurs is yours to tap.
Cell to Singularity - Evolution Never Ends has achieved a Player Score of 88, placing it in the #8 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 26,796 reviews on Steam. This breaks down to a total of 24,000 positive reviews and 2,796 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on both Windows and Mac systems. At the moment, it is possible to play Cell to Singularity - Evolution Never Ends on the Steam Deck (though some functionality may be limited).
| Release Date | 11/3/2021 |
| Developer | Computer Lunch |
| Publisher | Computer Lunch |
| Steam App Id | 977400 |
9. Off The Grid
Welcome to Off The Grid, the next-gen free to play Battle Royale from visionary director Neill Blomkamp. Set in a near-future world where contestants are cybernetically augmented and dropped into televised bloodsport. Death is temporary, but fame is forever.
Off The Grid has achieved a Player Score of 54, placing it in the #9 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 2,233 reviews on Steam. This breaks down to a total of 1,224 positive reviews and 1,009 negative reviews — making it "Mixed" on Steam.
It can be played and ran on Windows systems. At the moment, it is possible to play Off The Grid on the Steam Deck (though some functionality may be limited).
| Release Date | 7/17/2025 |
| Developer | Gunzilla Games |
| Publisher | Gunzilla Games |
| Steam App Id | 3659280 |
10. Unnamed Space Idle
Destroy endless waves of alien ships that have all but wiped out humanity in this long form, unfolding, sci-fi idle game. Customize your ship with different weapons and defenses to defeat specific enemy types and utilize a ton of different systems to increase your overall power.
Unnamed Space Idle has achieved a Player Score of 89, placing it in the #10 spot for the best free Sci-fi games. Its score was calculated by analyzing a total of 4,120 reviews on Steam. This breaks down to a total of 3,825 positive reviews and 295 negative reviews — making it "Very Positive" on Steam.
It can be played and ran on both Windows and Linux systems. At the moment, it is possible to play Unnamed Space Idle on the Steam Deck (though some functionality may be limited).
| Release Date | 7/27/2023 |
| Developer | Sylv |
| Publishers | |
| Steam App Id | 2471100 |
More Free Sci-fi Games
Explore even more rankings for the 100 best free Sci-fi games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 179,142 | 11/5/2020 | 67 | Free | Steam Charts | |
| 57,275 | 12/5/2024 | 76 | Free | Steam Charts | |
| 56,412 | 2/26/2023 | 86 | Free | Steam Charts | |
| 54,734 | 3/25/2013 | 87 | Free | Steam Charts | |
| 44,696 | 8/10/2023 | 30 | Free | Steam Charts | |
| 19,317 | 3/21/2022 | 94 | Free | Steam Charts | |
| 6,258 | 10/1/2019 | 77 | Free | Steam Charts | |
| 5,408 | 11/3/2021 | 88 | Free | Steam Charts | |
| 5,249 | 7/17/2025 | 54 | Free | Steam Charts | |
| 4,684 | 7/27/2023 | 89 | Free | Steam Charts | |
 | 4,624 | 12/29/2017 | 90 | Free | Steam Charts | |
 | 4,140 | 7/21/2020 | 88 | Free | Steam Charts | |
 | 3,971 | 12/16/2010 | 73 | Free | Steam Charts | |
 | 3,142 | 6/30/2024 | 57 | Free | Steam Charts | |
 | 1,608 | 10/3/2025 | 89 | Free | Steam Charts | |
 | 1,551 | 11/21/2024 | 73 | Free | Steam Charts | |
 | 1,510 | 4/4/2018 | 60 | Free | Steam Charts | |
 | 1,468 | 7/2/2025 | 60 | Free | Steam Charts | |
 | 1,360 | 11/27/2019 | 68 | Free | Steam Charts | |
 | 1,200 | 8/10/2022 | 60 | 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. (2026, May 13). Steam Store. Steam Store.
- Valve Corporation. (2026, May 13). Apex Legends™ on Steam. Steam Store.
- Valve Corporation. (2026, May 15). Marvel Rivals on Steam. Steam Store.
- Valve Corporation. (2026, May 15). Limbus Company on Steam. Steam Store.
- Valve Corporation. (2026, May 12). Warframe on Steam. Steam Store.
- Valve Corporation. (2026, May 15). Overwatch® on Steam. Steam Store.
- Valve Corporation. (2026, May 10). OBS Studio on Steam. Steam Store.
- Valve Corporation. (2026, May 15). Destiny 2 on Steam. Steam Store.
- Valve Corporation. (2026, May 16). Cell to Singularity - Evolution Never Ends on Steam. Steam Store.
- Valve Corporation. (2026, May 15). Off The Grid on Steam. Steam Store.
- Valve Corporation. (2026, May 15). Unnamed Space Idle on Steam. Steam Store.