- #1 EVE Online
97% matchMostly Positive73% of 39,560 reviews2010
Dev: Fenris Creations
Windows · Mac
Median: 3.0 hrsMean: 139.3 hrs≥1hr: 72%
Over 20 years of legendary space battles! Explore a massive living universe of danger and opportunity in a challenging and highly rewarding space adventure. Fight, trade, build, and connect with a universe driven and shaped directly by players.
Why similar: Space Sim 48.1%, Massively Multiplayer 15.8%, Space 13.5%, Adventure 9.2%, Third Person 8%
- #2 Star Conflict
96% matchMostly Positive73% of 15,239 reviews2013
Dev: Star Gem Inc.Pub: Gaijin Network Ltd
Windows · Mac · Linux
Median: 2.0 hrsMean: 34.6 hrs≥1hr: 62%
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!
Why similar: Space Sim 28.6%, Flight 17.5%, Massively Multiplayer 11.4%, Aliens 10.8%, RPG 9.1%
- #3 Abys Orbit
96% matchMixed66% of 85 reviews2026
Dev: EMG Tech
Windows
AbysOrbit a FREE, real-time space MMO played directly in your browser! Choose one of three factions, upgrade your ship, build your clan, and enter massive PvP battles for control of the galaxy. Auctions, Galaxy Gate, missions, and much more await youClaim your place before the universe is conquered
Why similar: MMORPG 47.7% ★, Space Sim 38.8%, Adventure 7.9%, 2D 3.5%, Action 2.1%
- #4 The Infinite Black 2
95% matchVery Positive85% of 238 reviews2023
Dev: SpellbookPub: www.Spellbook.com
Windows
Command a fleet of ships to hunt aliens, trade resources and loot treasure! Form corporations with your friends while fighting a never-ending intergalactic war in this open-world online space adventure!
Why similar: MMORPG 35.3% ★, Space Sim 32.4%, Massively Multiplayer 9.9%, Space 8.7%, Adventure 5.8%
- #5 Downfall MMORPG
94% matchMixed52% of 86 reviews2026
Dev: Rainmade Games
Windows
Downfall MMORPG is an open-world sci-fi & fantasy MMORPG where magic and technology collide. Choose a faction, forge your own playstyle, and fight for control of a living world in massive PvP battles and endless PvE adventures.
Why similar: MMORPG 51.6% ★, RPG 13.3%, Massively Multiplayer 12.9%, Adventure 8.1%, Sci-fi 5.3%
- #6 Astro Lords
94% matchMixed65% of 231 reviews2015
Dev: Aratog LLCPub: Conglomerate 5
Windows · Mac · Linux
Median: 48 minMean: 6.2 hrs≥1hr: 44%
Player bases are located on asteroids, which travel within the Oort Cloud. Once they’ve acquired the appropriate skills, players can control their asteroid’s movements. Mass-combat enthusiasts will love the Arena: here, players can battle it out against alien races or other Astro Lord players.
Why similar: MMORPG 35.8% ★, Space Sim 25.2%, Massively Multiplayer 13.1%, RPG 10.3%, Space 9.5%
- #7 Space Commander: War and Trade
93% matchMixed68% of 702 reviews2020
Dev: Home Net Games
Windows · Mac · Linux
Median: 1.2 hrsMean: 9.1 hrs≥1hr: 55%
Fight, explore the stars, trade, and lead your fleet across the galaxySpace Commander: War and Trade is an ultimate single player space-sim featuring spectacular graphics, intuitive combat and deep mechanics.
Why similar: Space Sim 35%, Flight 19.3%, RPG 13.9%, Aliens 10.2%, Base Building 7.9%
- #8 Subspace Discovery
92% matchMostly Positive74% of 145 reviews2023
Dev: FLICK Comp GmbH
Windows
Fly through Subspace, build your own ship, and engage in epic battles. Mine asteroids and research new technologies. Uncover the origins of the alien homeworld by solving weekly events in this Co-op PvE MMO.
Why similar: MMORPG 44.3% ★, Massively Multiplayer 17.1%, Space 13%, RPG 10.9%, Sci-fi 5.4%
- #9 Astroflux
91% matchMostly Positive72% of 348 reviews2016
Dev: Fula Fisken
Windows · Mac
Median: 3.5 hrsMean: 19.6 hrs≥1hr: 69%
Play Astroflux - a retro styled, action packed MMO space shooter.
Why similar: Massively Multiplayer 35.7%, RPG 26.7%, Adventure 16.2%, Space 15.1%, Action 4.3%
- #10 Elite Dangerous
89% matchMostly Positive77% of 107,797 reviews2015
Dev: Frontier Developments
Windows
Median: 18.3 hrsMean: 149.0 hrs≥1hr: 89%
Take control of your own starship and blaze your trail in an ever-changing galaxy. Master the arts of combat, mining and trade or venture out into the unknown across a 1:1 scale universe.
Why similar: Space Sim 55.6%, Space 15.2%, Massively Multiplayer 13.8%, Sci-fi 5.6%, RPG 5%
- #11 Shattered Void
88% matchMostly Positive72% of 95 reviews2024
Dev: yyy1505yyy
Windows · Linux
Space MMORPG where players can fly on different ships, collecting devices, subsystems and navigations or finding new weapons that will serve in battles. Take part in battles, explore the world, mine ore, trade, fight and build your own clan with a station.
Why similar: MMORPG 46.6% ★, Massively Multiplayer 24.4%, Space 16.2%, Sci-fi 6.2%, 2D 4.5%
- #12 Exocraft
89% matchMixed52% of 361 reviews2019
Dev: GoldFire Studios
Windows · Mac
Design unique spaceships and build the ultimate space mining fleet as you team up to battle for resources and glory in this massively multiplayer action strategy set in an alien wasteland.
Why similar: MMORPG 34.8% ★, Space Sim 28.2%, Massively Multiplayer 15.3%, Space 8.5%, Sci-fi 4.9%
- #13 Star Sonata 2
86% matchMixed67% of 293 reviews2020
Dev: Landauer Games
Windows
Median: 2.1 hrsMean: 60.2 hrs≥1hr: 60%
Star Sonata 2 is a space sandbox MMO that combines elements of action, RPG, and empire creation into a truly unique MMO. Explore the sandbox style universe, build persistent bases, construct trade ships, and even fight your way to the top and claim the Emperor’s Throne!
Why similar: MMORPG 38.6% ★, Space Sim 25.5%, RPG 10.2%, Robots 9.8%, Space 9.3%
- #14 Gangs of Space
86% matchMostly Positive76% of 433 reviews2017
Dev: Little Big MMO
Windows · Mac · Linux
Median: 1.1 hrsMean: 293.6 hrs≥1hr: 53%
Gangs of Space is a massively-multiplayer Rogue Shmup where Gangs of players compete for the conquest of the galaxy.
Why similar: MMORPG 44.2% ★, Massively Multiplayer 21.3%, Top-Down Shooter 13.1%, Space 9.2%, RPG 7.3%
- #15 Entropia Universe
84% matchMixed62% of 534 reviews2025
Dev: MindArk
Windows
Entropia Universe is a unique massively multiplayer online game (MMO) where virtual assets hold real-world value and players can participate in a thriving virtual sandbox economy.
Why similar: MMORPG 61.5% ★, Space 12.2%, RPG 8.5%, Sci-fi 6.5%, Massively Multiplayer 4.3%
- #16 Anarchy Online
83% matchVery Positive82% of 289 reviews2017
Dev: Funcom
Windows
Anarchy Online – the first ever science fiction MMO – is now on Steam! Compete and cooperate with thousands of players simultaneously on a vast, alien world. Join humanity nearly 30,000 years in the future in a world of perpetual conflict and scientific marvel.
Why similar: MMORPG 47.3% ★, Massively Multiplayer 21.4%, RPG 16.4%, Adventure 6.8%, Sci-fi 6.6%
- #17 Star Trek Online
82% matchMostly Positive79% of 21,376 reviews2012
Dev: Cryptic StudiosPub: Arc Games
Windows
Median: 6.8 hrsMean: 135.2 hrs≥1hr: 84%
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.
Why similar: MMORPG 45.3% ★, Massively Multiplayer 17.6%, Space 12.1%, RPG 11.6%, Sci-fi 6.7%
- #18 Destiny 2
79% matchMostly Positive78% of 662,710 reviews2019
Dev: Bungie
Windows
Median: 10.1 hrsMean: 333.0 hrs≥1hr: 86%
Explore the mysteries of Sol and experience exhilirating first-person shooter combat in Destiny 2. Unlock powerful abilities and collect unique gear across story missions, co-op, and PvP modes.
Why similar: MMORPG 38% ★, Looter Shooter 27.2% ★, Massively Multiplayer 10.2%, Shooter 8.5%, Space 6.6%
- #19 Nova Empire
81% matchMixed53% of 302 reviews2022
Dev: Gamebear Tech
Windows
Median: 1.6 hrsMean: 11.6 hrs≥1hr: 56%
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!
Why similar: Space Sim 61%, Sci-fi 10.2%, Base Building 9.4%, Massively Multiplayer 6.9%, Space 6.7%
- #20 SPACERIFT: Arcanum System
79% matchMostly Positive77% of 505 reviews2020
Dev: Arcanum Team
Windows
Median: 54 minMean: 9.9 hrs≥1hr: 43%
Space. Ships. Resources. Trading. Production. Combat. Mine ore, haul cargo, and find profitable trade routes. Buy and capture ships, build your fleet, construct stations, and develop your production. Start with your first ship. Build your empire!
Why similar: Space Sim 35.8%, MMORPG 28.9% ★, Flight 13.1%, Space 9%, Sci-fi 5.3%
- #21 Space Battle Royale
78% matchVery Positive86% of 80 reviews2023
Dev: MultiversalME
Windows
Welcome to cosmic chaos. This non-stop action arcade will test you to see if you are truly worthy of space travel. The full use of 3d space, five classes of weapons, and upgrades based on alien technology and alternative dimensions make for the most competitive and mind-expanding game out there.
Why similar: Flight 29.1%, Massively Multiplayer 24.4%, Space 16.6%, Shooter 15%, Sci-fi 7.7%
- #22 Second Galaxy
80% matchMixed52% of 1,204 reviews2019
Dev: Zilong Game Limited
Windows
Median: 42 minMean: 9.4 hrs≥1hr: 38%
Second Galaxy is an open world sci-fi game that combines RPG and SLG elements. You can navigate hundreds of different space ships, team up with players to form alliances, and engage in intergalactic battles with other players around the world.
Why similar: Massively Multiplayer 38.9%, RPG 29.5%, Space 24.1%, Sci-fi 7.5%
- #23 Avorion
76% matchVery Positive90% of 14,588 reviews2020
Dev: Boxelware
Windows · Mac · Linux
Median: 18.9 hrsMean: 99.6 hrs≥1hr: 90%
A procedural co-op space sandbox where players can build their own space ships out of dynamically scalable blocks. Fight epic space battles, explore, mine, trade, wage wars and build your own empire to save your galaxy from being torn apart by an unknown enemy.
Why similar: Space Sim 44.1%, Flight 26%, Space 12.2%, Third Person 8%, Sci-fi 5.6%
- #24 Battle Arena
78% matchMixed64% of 58 reviews2019
Dev: ShadowWolf Games
Windows
Battle Arena is a multiplayer, immersive 2D Sci-Fi shooter! Plunge into the world of space battles and be the first!
Why similar: Massively Multiplayer 88.6%, Action 11.4%
- #25 Spacelords
77% matchMixed53% of 3,282 reviews2017
Dev: MercurySteamPub: Mercury Steam Entertainment s.l.
Windows
Median: 1.2 hrsMean: 8.5 hrs≥1hr: 53%
Embark on an epic sci-fi, free-to-play adventure. Spacelords is a brand-new take on the shooter genre. Through its 4 vs 1 campaign, you experience both sides of the story: Join the Raiders in their fight to free the legendary Broken Planet, or switch sides and fight as the Antagonist alongside the invading hordes!
Why similar: Shooter 33.6%, Adventure 21.3%, Third Person 17.1%, Action 16.2%, Sci-fi 11.8%
- #26 Andromeda: Rebirth of Humanity
77% matchMixed65% of 118 reviews2021
Dev: Null Reference Games
Windows · Linux
Andromeda is a hybrid between a Space 4X and an MMO. An online universe sandbox with 2 galaxies full of planets to colonize. Build structures like Mines to generate resources to build ships and engage in fleet battles with NPCs and other players, or just sit and chat with the friendly community.
Why similar: Space Sim 56.7%, Massively Multiplayer 15.3%, Space 10.5%, RPG 7.8%, Sci-fi 5%
- #27 Nienix: Cosmic Warfare
74% matchVery Positive87% of 355 reviews2023
Dev: HolmCom
Windows · Mac · Linux
Search for the legendary lost artifact Nienix through galaxies in conflict! An open world space action RPG adventure that can be played both alone and together!
Why similar: Looter Shooter 30% ★, Flight 19.2%, Top-Down Shooter 17.4%, Shooter 8.9%, RPG 8.9%
- #28 Destination Sol
76% matchMostly Positive79% of 1,362 reviews2015
Dev: MovingBlocks
Windows · Mac · Linux
Median: 30 minMean: 3.8 hrs≥1hr: 30%
Pilot your ship in the seamless open world made of space, planets, and more. Find new ships and equipment, find allies and beat all the enemies in this open source space shooter!
Why similar: RPG 46%, Space 36%, 2D 8%, Action 6.4%, Sci-fi 3.6%
- #29 War Robots: Frontiers
73% matchMixed66% of 4,937 reviews2025
Dev: MY.GAMES
Windows
Median: 1.9 hrsMean: 10.3 hrs≥1hr: 64%
Gear up for tactical mech action in War Robots: Frontiers, a free-to-play multiplayer mech shooter. Construct and customize, squad up with Pilots online, and fire up your engines in massive intergalactic battles.
Why similar: Robots 51.3%, Sci-fi 15.4%, Shooter 11.6%, Action 10.5%, Third Person 6.2%
- #30 CosmicBreak Universal
75% matchMixed58% of 1,442 reviews2021
Dev: CyberStep, Inc.
Windows
Median: 1.5 hrsMean: 17.7 hrs≥1hr: 60%
CosmicBreak Universal is an MMO action game that lets you play massive battles of up to 30 vs 30 players using customizable robots and humanoids! Create your own original character and aim for victory with your allies!
Why similar: Massively Multiplayer 23.3%, RPG 18.5%, Shooter 15.9%, Robots 11.1%, Adventure 9.8%
- #31 Etherion Online
75% matchMixed51% of 70 reviews2023
Dev: iAppsBeats
Windows · Mac
Gear up! Become a prestige master in weapons or master a skill - join thousands of other players in this massive 2D adventure!
Why similar: MMORPG 43.1% ★, Top-Down Shooter 17%, Massively Multiplayer 15.5%, RPG 12.3%, Shooter 9.6%
- #32 Cosmic Miners
71% matchMixed56% of 60 reviews2025
Dev: bitByte Games
Windows
Explore asteroid fields, trade rare resources, and upgrade your ship in Cosmic Miners. Navigate faction alliances, complete missions, and rise through the ranks in a dynamic space adventure where your choices shape your path to cosmic power.
Why similar: Space Sim 43.7%, Flight 19.9%, Shooter 13.4%, Space 11%, Sci-fi 6%
- #33 SpaceBourne 2
68% matchMostly Positive76% of 5,166 reviews2025
Dev: Burak Dabak
Windows
Median: 2.6 hrsMean: 11.1 hrs≥1hr: 72%
Embark on a journey to greatness. Get ready for adrenaline-fueled battles and a chance to claim your place in the galaxy. Grab the controls of your ship, gear up for the fight, and unleash your ambition to conquer and build a new empire in the vastness of space.
Why similar: Space Sim 37.8%, Flight 23%, RPG 13.2%, Space 8.3%, Base Building 7.4%
- #34 The Infinite Black
73% matchMixed67% of 215 reviews2016
Dev: SpellbookPub: www.Spellbook.com
Windows · Mac · Linux
Median: 5.8 hrsMean: 83.8 hrs≥1hr: 74%
Fleet up with thousands of players in The Infinite Black -- The wildly popular online space combat and adventure game! Command massive spaceships, form powerful corporations, and battle it out in never-ending intergalactic warfare!
Why similar: Massively Multiplayer 44.5%, RPG 35.3%, Space 20.2%
- #35 Project Entropy
71% matchMixed52% of 266 reviews2024
Dev: FunPlus International AG
Windows
Welcome, commander, to Project Entropy- an ultimate Sci-Fi and role-playing game with battles in space. In this immersive MMO experience, you will command alien civilizations, conquer uncharted planets, and build Hero fleets.
Why similar: Aliens 52.7%, Base Building 26.8%, Sci-fi 20.5%
- #36 Pixel Starships
70% matchMostly Positive73% of 3,020 reviews2023
Dev: SavySoda
Windows · Mac · Linux
Median: 2.2 hrsMean: 24.2 hrs≥1hr: 64%
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.
Why similar: Space Sim 39.2%, Massively Multiplayer 14.3%, Space 11%, Aliens 10.1%, RPG 8.7%
- #37 Project Amalthea: Battlegrounds
72% matchMixed58% of 75 reviews2020
Dev: RunServer
Windows · Mac · Linux
There is a quarantine declared throughout the orbit so all the pilots are grounded except for the few ones allowed to participate in training battles. Join their ranks for blazing fast space battles with another players in this top-down shooter game
Why similar: Top-Down Shooter 21.8%, Massively Multiplayer 20.9%, Flight 17.2%, RPG 16%, Space 13%
- #38 Tidal Nexus Online
68% matchMixed57% of 339 reviews2026
Dev: Riptide Interactive
Windows
Tidal Nexus Online is a submarine themed old school open world MMO. Fight with monsters, trade and collect valuables in the depths to upgrade your sub. Join clans, participate in world events, make friends and enemies along the way.
Why similar: MMORPG 52.8% ★, RPG 21.3%, Massively Multiplayer 13.7%, Sci-fi 4.6%, 3D 4.1%
- #39 Starfighter: Infinity
71% matchVery Positive91% of 129 reviews2019
Dev: Ben Olding Games
Windows · Mac · Linux
A space based MMORPG with a focus on ‘dogfighting’ style action and exploration. Features a huge array of ships, imaginative weapons and ship upgrades with more being added all the time. Explore the galaxy, fight other players, form your own organisations, mine asteroids to craft new items, loot rare weapons from alien races, and more...
Why similar: Massively Multiplayer 47%, RPG 39.2%, Space 13.8%
- #40 Free Stars: The Ur-Quan Masters
67% matchVery Positive95% of 407 reviews2024
Dev: Pistol Shrimp
Windows · Mac
Experience the award-winning space saga. Travel to hyperspace, discover alien worlds, and meet an eclectic cast of characters. Find out what happened after the Ur-Quan invasion. And if the war still rages, fight for Earth and the Alliance of Free Stars!
Why similar: Top-Down Shooter 48%, RPG 31.2%, Sci-fi 9.2%, 2D 7.9%, Action 3.7%
- #41 Starcom: Unknown Space
65% matchVery Positive92% of 4,500 reviews2024
Dev: Wx3 Labs, LLC
Windows
Median: 8.4 hrsMean: 17.0 hrs≥1hr: 83%
Starcom: Unknown Space is an action RPG of space exploration and adventure. Build your own starship while discovering an epic story in a universe of strange mysteries, alien factions and uncharted worlds.
Why similar: Space Sim 35.7%, Top-Down Shooter 18%, Space 15.4%, RPG 10.2%, Aliens 8.9%
- #42 Interstellar Rift
69% matchMixed68% of 1,667 reviews2020
Dev: Split PolygonPub: Iceberg Interactive
Windows
Median: 4.3 hrsMean: 35.6 hrs≥1hr: 83%
Interstellar Rift is an open world starship simulator with an emphasis on ship construction and multi-player interaction. Survive in a hostile galaxy with your own custom designed and constructed starship. Invite other players to join your crew or fight them across the galaxy!
Why similar: Space Sim 53.1%, Aliens 15.1%, Space 12.2%, Adventure 7.2%, Sci-fi 5.9%
- #43 Star Hunter - Infinite Lagrange
69% matchMixed57% of 1,075 reviews2021
Dev: NetEase Games
Windows
Median: 2.7 hrsMean: 90.0 hrs≥1hr: 61%
In a remote corner of the Milky Way, you, a star hunter, will control a fleet, take on a wide variety of bounty contracts and missions, and venture into the vastness of space. You will hunt for mysterious items for your employers and explore specific targets in uncharted territory.
Why similar: Space Sim 38.6%, Massively Multiplayer 29.7%, Space 18.2%, Base Building 9.4%, 3D 4.1%
- #44 Stellarion
66% matchVery Positive97% of 79 reviews2025
Dev: Zana Domán
Windows
Upgrade your spaceship and conquer the stars in this thrilling space-mining adventure! Mine asteroids, battle enemies, and trade resources for powerful upgrades to customize your ship. Master the galaxy and embark on the ultimate journey!
Why similar: Space 53.8%, Sci-fi 28.3%, Action 17.8%
- #45 Astro Lords: Oort Cloud
70% matchMixed54% of 69 reviews2016
Dev: Aratog LLCPub: BISBOG SA
Windows
Astro Lords: Oort Cloud is a free-to-play, science-fiction MMORTS combining construction management with click-and-drag Artillery style combat and strategy elements such as exploration, raiding and espionage.
- #46 Deuterium Wars
67% matchMostly Positive78% of 603 reviews2019
Dev: Disquire
Windows
Deuterium Wars is a rapid 2D shooter. Create your own aircraft and plunge into heated battle with other players. What awaits you: an extensive role-playing system, craft, trading, and much more on a single server for all platforms.
Why similar: Massively Multiplayer 43.6%, RPG 29.4%, Shooter 17.3%, Action 5.7%, 2D 3.9%
- #47 Drox Operative 2
66% matchVery Positive89% of 293 reviews2021
Dev: Soldak Entertainment
Windows · Linux
Drox Operative 2 is a starship action RPG with warring alien races, fierce space battles, a dynamic, evolving galaxy, and co-op multiplayer for Windows and Linux.
Why similar: RPG 63.1%, Space 19.8%, Action 9.1%, Sci-fi 8%
- #48 Warspace 2
66% matchMixed61% of 87 reviews2025
Dev: Magic Game Art
Windows · Mac · Linux
Warspace 2 is a 1-4 player CO-OP space shooter with RPG elements, open-world and procedurally-generated galaxy. You can trade, craft, and fight your way through a universe, either solo or with friends.
Why similar: Space Sim 34.1%, Top-Down Shooter 20%, Aliens 10.3%, RPG 10.2%, Space 10.1%