Free Online Co-Op Games on Steam
Steam currently has 6,255 Online Co-Op 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 Online Co-Op game rankings were last updated on 12/11/2024.
Looking for more? Explore other lists such as:
- Best online co-op games on Steam
- Best online co-op Steam Deck games
- Best online co-op Steam games for Mac OS
- Best online co-op Linux games on Steam
- Free Steam games
- Most played Steam games
- Best rated Steam games
1. Counter-Strike 2
For over two decades, Counter-Strike has offered an elite competitive experience, one shaped by millions of players from across the globe. And now the next chapter in the CS story is about to begin. This is Counter-Strike 2.
Counter-Strike 2 holds the #1 spot for "best free Online Co-Op game on Steam" with a Player Score of 87. Its score was calculated by analyzing a total of 8,427,597 reviews on Steam. This breaks down to a total of 7,325,088 positive reviews and 1,102,509 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 Counter-Strike 2 on the Steam Deck (though some functionality may be limited).
2. PUBG: BATTLEGROUNDS
Play PUBG: BATTLEGROUNDS for free. Land on strategic locations, loot weapons and supplies, and survive to become the last team standing across various, diverse Battlegrounds. Squad up and join the Battlegrounds for the original Battle Royale experience that only PUBG: BATTLEGROUNDS can offer.
PUBG: BATTLEGROUNDS has achieved a Player Score of 59, placing it in the #2 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 2,470,786 reviews on Steam. This breaks down to a total of 1,457,197 positive reviews and 1,013,589 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 PUBG: BATTLEGROUNDS on the Steam Deck.
| Release Date | 12/21/2017 |
| Franchise | KRAFTON, Inc. |
| Developers | |
| Publisher | KRAFTON, Inc. |
| Steam App Id | 578080 |
3. Dota 2
Every day, millions of players worldwide enter battle as one of over a hundred Dota heroes. And no matter if it's their 10th hour of play or 1,000th, there's always something new to discover. With regular updates that ensure a constant evolution of gameplay, features, and heroes, Dota 2 has taken on a life of its own.
Dota 2 has achieved a Player Score of 81, placing it in the #3 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 2,393,578 reviews on Steam. This breaks down to a total of 1,954,212 positive reviews and 439,366 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 Dota 2 on the Steam Deck (though some functionality may be limited).
4. 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 77, placing it in the #4 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 49,182 reviews on Steam. This breaks down to a total of 38,589 positive reviews and 10,593 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 | 12/6/2024 |
| Developer | NetEase Games |
| Publisher | NetEase Games |
| Steam App Id | 2767030 |
5. Team Fortress 2
Nine distinct classes provide a broad range of tactical abilities and personalities. Constantly updated with new game modes, maps, equipment and, most importantly, hats!
Team Fortress 2 has achieved a Player Score of 88, placing it in the #5 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 1,131,744 reviews on Steam. This breaks down to a total of 1,005,470 positive reviews and 126,274 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 Team Fortress 2 on the Steam Deck (though some functionality may be limited).
6. Delta Force
Delta Force, a free-to-play 1st-person tactical shooter, returns as the latest in the classic series. With 25 years defining the genre, Delta Force is back with an upgraded arsenal of weaponry, jaw-dropping environments, and a truly dynamic world.
Delta Force has achieved a Player Score of 65, placing it in the #6 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 21,885 reviews on Steam. This breaks down to a total of 14,290 positive reviews and 7,595 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 | 12/4/2024 |
| Developer | Team Jade |
| Publisher | TiMi Studio Group |
| Steam App Id | 2507950 |
7. 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 #7 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 600,203 reviews on Steam. This breaks down to a total of 524,399 positive reviews and 75,804 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 |
| Developer | Digital Extremes |
| Publisher | Digital Extremes |
| Steam App Id | 230410 |
8. Once Human
Once Human is a multiplayer open-world survival game set in a strange, post-apocalyptic future. Unite with friends to fight monstrous enemies, uncover secret plots, compete for resources, and build your own territory. Once, you were merely human. Now, you have the power to remake the world.
Once Human has achieved a Player Score of 73, placing it in the #8 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 112,802 reviews on Steam. This breaks down to a total of 82,754 positive reviews and 30,048 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 Once Human on the Steam Deck.
| Release Date | 7/9/2024 |
| Developer | Starry Studio |
| Publisher | Starry Studio |
| Steam App Id | 2139460 |
9. tModLoader
Dig, Fight, and Build your way through the world of player-created mods on Terraria with tModLoader - this DLC makes modding Terraria a reality!
tModLoader has achieved a Player Score of 96, placing it in the #9 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 286,570 reviews on Steam. This breaks down to a total of 278,300 positive reviews and 8,270 negative reviews — making it "Overwhelmingly Positive" on Steam.
It can be played and ran on Windows, Mac, and Linux systems. At the moment, it is possible to play tModLoader on the Steam Deck (though some functionality may be limited).
10. The First Descendant
The First Descendant is a third-person looter shooter powered by Unreal Engine 5. Become a Descendant. Fight for the survival of humanity. Descendants have unique abilities to tackle both solo and co-op missions. Up to 4 players use varied mechanics to defeat giant bosses. BE THE FIRST DESCENDANT!
The First Descendant has achieved a Player Score of 56, placing it in the #10 spot for the best free Online Co-Op games. Its score was calculated by analyzing a total of 95,668 reviews on Steam. This breaks down to a total of 54,213 positive reviews and 41,455 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 The First Descendant on the Steam Deck.
| Release Date | 6/30/2024 |
| Developer | NEXON Games Co., Ltd. |
| Publisher | NEXON |
| Steam App Id | 2074920 |
More Free Online Co-Op Games
Explore even more rankings for the 100 best free Online Co-Op games available on Steam.
| Image | Name | Actions | ||||
|---|---|---|---|---|---|---|
| 721,592 | 8/21/2012 | 87 | Free | Steam Charts | |
| 320,364 | 12/21/2017 | 59 | Free | Steam Charts | |
| 290,800 | 7/9/2013 | 81 | Free | Steam Charts | |
| 254,633 | 12/6/2024 | 77 | Free | Steam Charts | |
| 43,287 | 10/10/2007 | 88 | Free | Steam Charts | |
| 43,110 | 12/4/2024 | 65 | Free | Steam Charts | |
| 32,522 | 3/25/2013 | 87 | Free | Steam Charts | |
| 23,867 | 7/9/2024 | 73 | Free | Steam Charts | |
| 18,810 | 5/16/2020 | 96 | Free | Steam Charts | |
| 13,817 | 6/30/2024 | 56 | Free | Steam Charts | |
 | 8,349 | 12/8/2023 | 76 | Free | Steam Charts | |
 | 7,214 | 11/21/2024 | 76 | Free | Steam Charts | |
 | 6,477 | 10/23/2013 | 89 | Free | Steam Charts | |
 | 6,413 | 11/15/2017 | 77 | Free | Steam Charts | |
 | 5,983 | 6/7/2024 | 71 | Free | Steam Charts | |
 | 5,137 | 9/29/2021 | 46 | Free | Steam Charts | |
 | 4,717 | 10/17/2017 | 81 | Free | Steam Charts | |
 | 4,465 | 11/9/2016 | 79 | Free | Steam Charts | |
 | 3,621 | 11/20/2024 | 88 | Free | Steam Charts | |
 | 3,416 | 8/9/2024 | 93 | 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. (2024, December 11). Steam Store. Steam Store.
- Valve Corporation. (2024, December 11). Counter-Strike 2 on Steam. Steam Store.
- Valve Corporation. (2024, December 11). PUBG: BATTLEGROUNDS on Steam. Steam Store.
- Valve Corporation. (2024, December 7). Dota 2 on Steam. Steam Store.
- Valve Corporation. (2024, December 11). Marvel Rivals on Steam. Steam Store.
- Valve Corporation. (2024, December 5). Team Fortress 2 on Steam. Steam Store.
- Valve Corporation. (2024, December 11). Delta Force on Steam. Steam Store.
- Valve Corporation. (2024, December 6). Warframe on Steam. Steam Store.
- Valve Corporation. (2024, December 11). Once Human on Steam. Steam Store.
- Valve Corporation. (2024, December 2). tModLoader on Steam. Steam Store.
- Valve Corporation. (2024, December 11). The First Descendant on Steam. Steam Store.