Steam app 799600 · updated 12 Sep 2026, 18:05 UTC
Design and simulate the starships of your dreams! Command your ship or fleet in epic battles and manage your crew while exploring a dangerous galaxy. Play alone or with friends, test your ships in online PvP, and let your imagination reach for the stars!
719 hourly samples, with the daily peak drawn over them. Weekends are shaded.
50 months, February 2018 to September 2026. The highest number of people in the game at once, each month, on a time axis -- a gap in the record stays a gap.
The highest number of people in the game at once, each month. Four, because four is as far back as the source keeps anything finer than one figure a month.
31 days, each one the highest figure that day. The source keeps no hourly detail this far back. Weekends are shaded.
31 days as the curve, each the highest figure that day. Behind it, 438 hourly samples from 13 Aug, which is as far back as the source keeps every hour. Weekends are shaded.
12 days as the curve, each the highest figure that day. Behind it, 281 hourly samples. Each dip is a night. Weekends are shaded.
Cosmoteer: Starship Architect & Commander was released on 24 Oct, 2022.
| Language | Full audio |
|---|---|
| English | |
| French | |
| German | |
| Portuguese - Brazil | |
| Russian | |
| Simplified Chinese | |
| Spanish - Latin America | |
| Spanish - Spain | |
| Japanese |
A blank audio cell means full audio was not marked in the returned language list.
50 developer announcements, Sep 2024 to May 2026 · times in UTC
Bugfix: When running in developer mode, mods that add new ship classes would crash the game during loading with a "cannot be used in the demo" error. (This bug was introduced in yesterday's 0.30.4b hotfix.)
Patch notesPossible fix for rare, random crashes during gameplay. Attention Linux Players: We're aware that many of you are experiencing random and often frequent freezes/crashes since the 0.30.4 update. We're currently in communications with the…
Patch notesBugfix: The game would sometimes load forever while jumping to a new star system. When updating an existing Steam Workshop item, the name, description, and preview image will no longer be updated unless you specially check a box to do so.
Patch notesCosmoteer update 0.30.4 is now available! This is a small update that adds "Ironman Mode" to Career, adds new ships, improves balance, and fixes bugs.Enjoy!Patch Notes: Balance: Small Shield (Overclocked): 'Extended' health reduced…
Walt DestlerCosmoteer release candidate 0.30.4 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.)This release candidate adds "Ironman Mode" to…
Patch notesBugfix: In single-player, detonating an Explosive Charge while hovering another part would crash the game.
Patch notesCrash when overclocked shields receive negative damage. Possible freeze when placing parts that change heat build stats. Explosions that split ships could cause common multiplayer desyncs and inconsistent damage.
Patch notesHey Cosmoteers!My friend has just released a free demo for their game Heretic Red, which is a narrative-driven detective mystery game that's set in a snowy village with murder, blasphemy, and religious tension. I played the demo myself and…
Walt DestlerBugfix: Mods whose /Actions list used inheritance would usually crash on load.
Patch notesBugfix: Crash when booting the game on a computer that doesn't have a settings file saved yet.
Patch notesCosmoteer update 0.30.3 is now available! This is a small update that makes quality-of-life improvements, adds new ships, improves balance, and fixes bugs.Enjoy!Patch Notes:Built-In Ships:Added 4 new Fringe combat ships: Hotshot, Scorcher…
Walt DestlerCosmoteer release candidate 0.30.3 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.)This release candidate makes quality-of-life…
Patch notesFixed overclocked railgun splitting projectiles causing lag/stutter.
Patch notesFixed frequent desyncs during gameplay, especially during ship construction.
Patch notesCosmoteer update 0.30.2 is now available! This update tweaks the new sound effects in response to player feedback (thanks!!), makes quality-of-life improvements, adds new ships, improves balance, and fixes bugs.Enjoy!Patch Notes:Built-In…
Walt DestlerCosmoteer release candidate 0.30.2 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.)This is a release candidate tweaks the new sound…
Patch notesModding: Re-added the 'ElementDeliver' common sound effects, because its removal was causing mods to crash. Bugfix: Rare crash when opening the galaxy map with some galaxy seeds.
Patch notesFixed an issue causing incompatibility with some mods.
Patch notesCosmoteer update 0.30.1 is now available! This update has new audio effects, new ships, balance tweaks, quality-of-life improvements, and bug fixes.Enjoy!Patch Notes:Built-In Ships:Added 2 new Monolith combat ships: Justicar, Perfect…
Walt DestlerBugfix: Missile Launchers set to any type other than H.E. would lose their loaded missile parts after loading a saved game. Bugfix: Overclocked Deck Cannons had their reload timers reset after loading a saved game.
Patch notesCosmoteer release candidate 0.30.1 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.)This is a release candidate contains a ton new…
Patch notesSaved game files containing ships that were under construction and had overclocked parts could sometimes fail to load. Mod files with names in the format 'mod_*.rules' will no longer be considered if they don't contain a…
Patch notesMod authors can now simultaneously support multiple versions of Cosmoteer within a single mod package. To do so, the mod author should add additional 'mod.rules' or 'mod_*.rules' files, optionally inside sub-folders if desired. Cosmoteer…
Patch notesReduced the chance of full-size fire spreading per-tick from 40% to 15%. Reduced the time it takes a full-size fire to scorch a part from 40 seconds to 25. Updates/fixes to all language translations. Updates/fixes to several Great House Io…
Patch notesThis is a small patch to fix a handful of issues in the recent "Meltdown Update".The Thermal Resonance Lance's heat blast on destruction is now scaled by how much heat is in its storage.Ammo Factories and H.E. Factories now have a chance of…
Patch notesThe Biggest Cosmoteer Update YetGreetings, Cosmoteers! I'm Walt, the creator of Cosmoteer, and I'm here to tell you that The Meltdown Update, our biggest update ever, is now live! This massive update introduces an entirely new gameplay…
Walt DestlerCosmoteer release candidate 0.30.0 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.)This is a release candidate for the long-awaited…
Patch notesAhoy Cosmoteers! Cosmoteer update 0.29.0 is now available for all! This update greatly improves the ship painting capabilities by adding support for resizing, stretching, and inverting decals along with dozens of new decals and a handful of…
Walt DestlerCosmoteer release candidate 0.29.0 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.) This release candidate adds new features and…
Patch notesCosmoteer update 0.28.2 is now available! This update has new ships, balance tweaks, user interface improvements, and bug fixes. We're still working hard on more improvements as part of Career 2.0, as well as a very cool new weapon and…
Walt DestlerCosmoteer release candidate 0.28.2 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.) This release candidate has a lot of…
Patch notes(Tech/Performance): Upgraded to .NET 9 (again) because we believe we have resolved the issue that was causing Cosmoteer to not boot for some players. Please let us know if you're still having issues. (And if you are, try updating your…
Patch notesDowngraded from .NET 9 to .NET 8 because we suspect .NET 9 was preventing the game from booting for some players. If you were one of those players, please let us know if this solves the problem.
Patch notesCosmoteer update 0.28.1 is now available! This update has a lot of quality-of-life improvements, some balance changes, improvements to ship collision avoidance, and a handful of bug fixes. We're still working hard on more improvements as…
Walt DestlerCosmoteer release candidate 0.28.1 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.) This release candidate has a lot of…
Patch notesBugfix: Memory usage could in some circumstances continuously increase almost indefinitely during gameplay.
Patch notes(Bugfix): When loading a saved game in multiplayer (or resuming after a desync), an auto-save could be triggered while loading/transferring the save file which would then cause a crash. (Bugfix): Dragging the game window between monitors…
Patch notes(Bugfix): Rare crash/freeze caused by ships trying to pathfind around clouds or storms. (Bugfix): Crash caused by changing missile launcher type while munitions are being transferred from it. (Bugfix): Error when saving the game after…
Patch notes(Bugfix): The message showing how much fame the player should have to hire more crew would show the incorrect fame amount if the player had already hired as many crew as possible for their current fame level.
Patch notesAhoy Cosmoteers! The Steam Awards have started again, and this year Cosmoteer is eligible for the "Labor of Love" award. Please consider nominating Cosmoteer! (I've been working on Cosmoteer for over THIRTEEN YEARS! If that's not a Labor of…
Walt DestlerBugfix: Ship velocity arrows were unintentionally revealing the locations of enemy ships hidden in gas clouds.
Patch notesBugfix: The tutorials list was overlapping with the missions list on the HUD.
Patch notesCosmoteer update 0.28.0 is now available! This update has significant quality-of-life improvements, Career mode improvements, balance changes, and bug fixes. We're still working hard on more improvements as part of Career 2.0, but we wanted…
Walt DestlerCosmoteer release candidate 0.28.0 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.) This release candidate has a ton of…
Patch notesUpdates to all existing language translations, including a handful of fixes for the new Japanese translation.
Patch notesCosmoteer update 0.27.2 is now available! This update adds support for the Japanese language, plus it contains a handful of bug fixes, quality-of-life improvements, and other minor changes. We're still working hard at a bunch of upcoming…
Walt DestlerCosmoteer release candidate 0.27.2 is now available for testing! (To play this release candidate, you must opt in to test it. Please see this post for info on how to test release candidates.) This release candidate contains a handful of bug…
Patch notes(Bugfix): Rare errors loading some saved games.
Patch notesFixed a memory leak for the host in multiplayer when repeatedly starting or loading games with the same other player(s) still connected.
Patch notesFixed a memory leak caused by repeatedly starting or loading games.
Patch notesWhat Steam runs, and with what. Straight from the app configuration.
| Description | Executable | Arguments | Platform | |
|---|---|---|---|---|
| Launch | Bin/Cosmoteer.exe | windows | ||
| Temporarily Disable Mods | Bin/Cosmoteer.exe | --no-mods | windows | |
| Developer Mode | Bin/Cosmoteer.exe | --devmode | windows |
The folders Steam Cloud syncs. The root is a token Steam uses for a location on your own machine, not a path this page can know.
| Root | Folder | Files |
|---|---|---|
WinSavedGames | Cosmoteer\{64BitSteamID}\Saved Ships | *.ship.png and below |
WinSavedGames | Cosmoteer\{64BitSteamID}\Saved Games | *.savedgame |
It runs on public data and somebody's spare time.
https://paypal.me/KintaroPalPay[email protected]0x4d559C765AA8BFe336E36d5b76024926767eD38dTJtctWU9uetJaTBoSybd1RErW7n9duTKVG