- Games
- Cosmoteer: Starship Architect & Commander
Cosmoteer: Starship Architect & Commander
A starship building game where you and friends design ships, take contracts and fight enemy ships online.
Online co-op for up to 8 players.
- 8 online
Where to buy
Playing together
- Online co-op8 players
- Local co-opNot confirmed
- Not confirmedFriends on different platforms, such as PC and PlayStation, can play together.
- Not confirmedA friend can join or leave while you are already playing, without starting over.
- Not confirmedFriends play free with a Friend's Pass or similar.
- Steam DeckPlayableValve's own rating
About the game
You design starships room by room, placing guns, engines, corridors and crew quarters on a grid. Then you take the ship out to accept contracts, shoot enemy ships, mine asteroids and salvage wrecks. The loot pays for bigger ships and better parts. Battles run in real time with a pause, and a ship can break into pieces when it is hit.
In co-op Career, you and a friend can fly one ship together, with one of you handling the fighting and the other the building. You can also each run your own ships and fight side by side. Online co-op normally takes four players, and a built-in mod raises that to eight.
It is still in early access and runs on Windows only. It suits a small group that likes to tinker, plan and spend long evenings growing a fleet.
How it feels
Kind of game
One lasting world your group settles. You gather, build and push into dangerous places together.
- At its heart
- Sessions
- Ongoing world
Rated on our own feel scale. 4 sources back these ratings.
Screenshots
From the Steam store page. Open one to see it full size.
If you liked Cosmoteer: Starship Architect & Commander
You will probably enjoy these too. Each one says why.

ATMOSFAR
Why it scores 82%
What they share
- Kind of game
- Shared survival world
- About
- Science fiction and Building vehicles
- Core to both
- Building and creating
- Sessions
- Ongoing world
- Notable in both
- Working in sync, Exploring, Tension and danger, Planning ahead, Unlocks and progress
- Co-op
- Online co-op
How ATMOSFAR differs
- Fits a smaller group than Cosmoteer: Starship Architect & Commander
- Coming 29 October 2026
- 4 online
Both give your group a hard world to survive in together. Both are about science fiction and building vehicles. Both let you build things together.
But fits a smaller group than Cosmoteer: Starship Architect & Commander.

Avorion
Why it scores 79%
What they share
- Kind of game
- Shared survival world
- About
- Science fiction and Building vehicles
- Core to both
- Building and creating
- Sessions
- Ongoing world
- Notable in both
- Exploring, Tension and danger, Planning ahead, Getting better, Fighting, Unlocks and progress
- Co-op
- Online co-op
How Avorion differs
- Cozier than Cosmoteer: Starship Architect & Commander
- More time to just hang out than Cosmoteer: Starship Architect & Commander
- Online
Both give your group a hard world to survive in together. Both give you one lasting world to come back to. Both are about science fiction and building vehicles.
But cozier than Cosmoteer: Starship Architect & Commander.

Rooted
Why it scores 78%
What they share
- Kind of game
- Shared survival world
- About
- Science fiction
- Core to both
- Building and creating
- Sessions
- Ongoing world
- Notable in both
- Exploring, Tension and danger, Planning ahead, Getting better, Fighting, Unlocks and progress
- Co-op
- Online co-op
How Rooted differs
- Scarier than Cosmoteer: Starship Architect & Commander
- Coming 2027
- 6 online
Both give your group a hard world to survive in together. Both are about science fiction. Both let you build things together.
But scarier than Cosmoteer: Starship Architect & Commander.
All co-op facts
Last checked 28 October 2026. The small numbers link to the page that states each fact.
Co-op
- Fewest players online
- Not confirmed
- Local co-op
- Not confirmed
- Most players on one screen
- Not confirmed
- Split or shared screen
- Not confirmed
- Separate-device co-op
- Not confirmed
- Most players on separate devices
- Not confirmed
- Free base co-op
- No
Steam sells the game for 19.99 US dollars. The page also offers a demo, and the old free Cosmoteer Classic build on itch.io lists PvP multiplayer only, so neither makes co-op free.
- 678
- Confirmed free setups
- Does not apply
- Crossplay
- Not confirmed
- Crossplay between
- Not confirmed
- Friends can join mid-game
- Not confirmed
- Only one of you needs to buy it
- Not confirmed
- Voice chat by distance
- Not confirmed
Sources
11 pages
cosmoteer.netOfficial site, read 28 October 2026
Backs Online co-op, About, Building and creating, Fighting, Planning ahead, Getting better, Exploring, Unlocks and progress.
- Online co-op: Page says you explore the galaxy alone or in online co-op with friends.
- About: Describes designing starships and commanding them in battle while exploring a galaxy.
- Building and creating: Describes laying out a ship room by room, and a Creative Mode with unlimited resources.
- Fighting: Describes real-time tactical battles where every module can be targeted.
- Planning ahead: Describes commanding a ship or fleet, where the design decides how the ship performs.
- Getting better: Says the ship tools are easy to learn but hard to master.
- Exploring: Describes exploring a procedurally generated galaxy.
- Unlocks and progress: Mentions earning loot and upgrading your own ship.
steamcommunity.comOfficial news, read 28 October 2026
Backs Most players online.
- Most players online: Update 0.28.0 patch notes of 2024-11-27 say a built-in mod raises the maximum number of players in co-op Career from 4 to 8, so the cap is 4 without it. Read through Steam's news feed. It applies to Career. No later patch note changes it.
blog.cosmoteer.netOfficial news, read 28 October 2026
Backs Online co-op.
- Online co-op: Maker blog of 2022-07-29 says the new Career Mode also supports co-op multiplayer.
blog.cosmoteer.netOfficial news, read 28 October 2026
Backs Online co-op, Kind of game, Sessions, Working in sync, Exploring.
- Online co-op: Maker blog of 2022-08-06 walks through one player hosting a saved Career game for a friend who joins.
- Kind of game: The example has a Career save where you mine, salvage and upgrade, then a friend joins and the two of you run missions and explore many systems.
- Sessions: The example has the pair exploring dozens of star systems over many hours in the same save.
- Working in sync: One friend flies and fights while the other designs and builds, and the pair can share one ship or each run their own.
- Exploring: The example checks unknown signals, then has the pair exploring dozens of star systems across the galaxy.
gamespress.comOfficial news, read 28 October 2026
Backs Release status, Release date.
- Release status: Maker press release of 2022-10-04 says the game was headed into early access.
- Release date: The release says early access starts on October 24th.
store.steampowered.comStore page, read 28 October 2026
Backs Online co-op, Release status, Free base co-op, Kind of game, About, Building and creating, Exploring, Tension and danger, Planning ahead, Getting better.
- Online co-op: Features list Online Co-op. LAN Co-op is listed separately and does not count as local co-op on one device.
- Release status: The page carries the Early Access block and the maker's roadmap notes.
- Free base co-op: Steam sells the game for 19.99 US dollars. The page also offers a demo, and the old free Cosmoteer Classic build on itch.io lists PvP multiplayer only, so neither makes co-op free.
- Kind of game: User tags include Survival, Building, Exploration and Online Co-Op.
- About: User tags include Sci-fi, Space and Spaceships.
- Building and creating: User tags include Building.
- Exploring: User tags include Exploration.
- Tension and danger: User tags include Difficult.
- Planning ahead: User tags include Strategy and Real-Time with Pause.
- Getting better: User tags include Difficult.
store.steampowered.comStore data, read 28 October 2026
Backs Steam app ID, Online co-op, Platforms, Release status, Release date, Genres, Free base co-op.
- Online co-op: Categories include Online Co-op and LAN Co-op.
- Platforms: Steam lists Windows only, with no macOS or Linux build.
- Release status: Steam lists the game under the Early Access genre.
- Release date: Steam shows Oct 24, 2022, the day early access began.
- Genres: Steam lists Simulation and Strategy, which agree with Wikidata.
- Free base co-op: Steam marks the game as not free.
walternaterealities.itch.ioStore page, read 28 October 2026
Backs Free base co-op.
- Free base co-op: This is the old free Cosmoteer Classic build 0.15.18. Its page describes PvP battles and no co-op, and the maker says the Steam version is far newer.
store.steampowered.comStore data, read 28 October 2026
Backs Steam Deck.
- Steam Deck: Valve rates the game Playable on Steam Deck.
wikidata.orgWikidata, read 28 October 2026
Backs Wikidata item, Genres, Release date, Release status.
- Genres: P136 lists simulation video game and strategy video game.
- Release date: P577 is 2022-10-24, qualified as early access.
- Release status: The release date statement carries an early access qualifier.
pcgamer.comPress, read 28 October 2026
Backs Online co-op, Building and creating, Fighting, Unlocks and progress, Getting better.
- Online co-op: PC Gamer, 2022-10-30, says you can do the full loop with friends in co-op.
- Building and creating: Describes a starship designer where you command a growing custom fleet.
- Fighting: Describes defeating enemies as one part of a loop with contracts and mining.
- Unlocks and progress: Describes using loot from enemies, contracts and mining to upgrade your ship for harder tasks.
- Getting better: Says it is easier to start than other complex 2D ship builders, with more depth once you get into design.








