Cosmo Arena
Free · play online in your browser, no download
Command one capital ship in real-time three-lane space battles, three against three or six against six, in the browser or on a phone.
Official site cosmoarena.co, verified Nov 3, 2026. Linked from the developer's own Reddit post on r/aigamedev and set as the seller website of the App Store listing.
Rights holder / original work: StarCraft II and its Star Battle arcade map (Blizzard Entertainment; the map's authors are not named)
The developer says the game set out to recreate the gameplay of Star Battle, a StarCraft II custom arcade map, and the site describes the game as inspired by it. The site's ability list includes the “Yamato cannon”, a StarCraft name. The ship models are the developer's own (made from ChatGPT images and converted with Meshy). No source mentions a licence or any connection to Blizzard Entertainment or the map's authors. (cosmoarena.co)
VibeGameDB lists this game only to document that it was made with AI coding tools. We do not host it, we do not represent the rights holder, and listing it does not mean it is licensed.
Where to play
Every platform this game is on. Links are checked against official sources; we never host or mirror games.
- Play free — official siteBrowserReleased · The developer called it “still full of bugs” in August 2026Free
Runs in a desktop or mobile browser. No download.
Browser (no download) · Mobile · Official link verified Nov 3, 2026.
- View on the App StoreApp StoreReleasedFree
Install from Apple's App Store on an iPhone or iPad.
Mobile · Apple App Store
About Cosmo Arena
A free real-time player-versus-player space battle game that runs in the browser and on mobile, with no download or account needed to try it. You command a single capital ship; both teams' stations launch fighter waves down three lanes, and destroying them earns minerals, the only way to grow stronger. You spend them at your own station on lasers, engines, weapon range and abilities, then push. Weapons fire automatically at anything in range, so combat is about positioning, and the only things you aim are abilities. There are five hulls (the Vindicator line warship, the Sovereign carrier that launches interceptors, the Destroyer, the Warden support ship and the Juggernaut siege platform) with around forty abilities between them, and permadeath: lose your hull and you are out for the rest of the match. Matches are three against three on a small map or six against six on a large one, online against other players or on your own against computer-controlled opponents, with a guided tutorial, rated online matches and leaderboards. The developer, known as Technical_Ideal9 on Reddit, says it was built entirely with Claude Code and three.js, and that it set out to recreate the gameplay of Star Battle, a StarCraft II custom arcade map and the developer's favourite. The 3D ship models were made from ChatGPT images converted with Meshy. Free at cosmoarena.co and on the App Store; the site also mentions an Android app.
How it was built
Partially verifiedThe developer's post on r/aigamedev (19 Aug 2026, UTC) is titled “Built a real-time PvP space battle game entirely with Claude Code and three.js”. It describes the stack as three.js and WebGL for rendering, a Node WebSocket server for authoritative multiplayer, SQLite for accounts, ratings and configuration, and Capacitor for the Android build, with custom GLB models made from ChatGPT images and converted with Meshy. No model is named and the workflow is not described further.
A three.js and WebGL client with a Node WebSocket server that runs the multiplayer authoritatively and SQLite for accounts, ratings and configuration; the Android app is built with Capacitor. The ship models are GLB files made from ChatGPT images and converted to 3D with Meshy, per the developer's post. The game's script contains its own computer-controlled opponents for offline play; it makes no calls to AI services.
- Engine / framework
- Three.js
- Languages
- JavaScript
- Team size
- Not disclosed
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“Star Battle used to be my favourite custom SC2 arcade map (still is) and I sank an unreasonable number of hours into somewhat replicating the gameplay.”Verification notes: AI tool, stack and the Star Battle inspiration from the developer's post on r/aigamedev by u/Technical_Ideal9 (19 Aug 2026, 21:21 UTC), read from the Arctic Shift Reddit archive on 7 Nov 2026; the post links cosmoarena.co. Ships, modes and rules from the site's own description; operator, Android purchases and server location from its privacy policy (last updated 30 Sep 2026); App Store release date (14 Sep 2026), seller, version 0.38.0, 12+ rating and the absence of ratings from Apple's lookup data; all read on 7 Nov 2026. “Entirely with Claude Code” is the post title's wording; no AI share is stated in numbers, so none is recorded. The developer is known only by the Reddit handle; the App Store names a developer, Longevify, and a seller company, 17987421 Canada Ltd., and no person, so team size and location are not recorded. The Android app is mentioned by the post and the privacy policy but was not found as a listing we can record (Google Play is not a platform we list). The “AI” opponents on the site are computer-controlled players; the game's main script (game.js) was searched and contains no OpenAI, Anthropic or other AI service addresses. The site's changelog loads in the browser and was not read. The App Store shows no ratings yet. The game was not played.
Development history
The developer announces the game on r/aigamedev as built entirely with Claude Code and three.js, free in the browser and on Android.
DeveloperReddit (u/Technical_Ideal9)Released on the App Store.
OfficialApple App Store
Game performance
Each figure measures something different — concurrent players, owners, downloads and sales are never interchangeable and are never added together. Labels show where each number comes from.
Browser (official site)
Free in the browser with no account needed to try it; an account keeps the callsign and progress. The privacy policy mentions Google Play purchases of credits in the Android app; whether anything is sold on the web or iOS was not confirmed.
No public metrics recorded for this listing.
Not publicly available: Concurrent players (site), Monthly revenue, Gross revenue.
App Store (iOS)
Free on iPhone and iPad; rated 12+. Apple's lookup data does not show whether there are in-app purchases.
Not publicly available: Gross revenue.
Reviews & rankings
Not yet reviewed by our editors.
Not currently ranked.
Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| Built a real-time PvP space battle game entirely with Claude Code and three.js (r/aigamedev) Reddit (u/Technical_Ideal9) | Social post | Aug 19, 2026 | Nov 3, 2026 |
| Cosmo Arena — Free PvP Space Battle Game in Your Browser cosmoarena.co | Official site | Not confirmed | Nov 3, 2026 |
| Cosmo Arena — Privacy policy cosmoarena.co | Official site | Sep 30, 2026 | Nov 3, 2026 |
| Cosmo Arena on the App Store Apple App Store | Store page | Sep 14, 2026 | Nov 3, 2026 |
| Official game page (language check) Technical_Ideal9 | Official site | Not confirmed | Nov 3, 2026 |
Get your badge
Made this game? Add a “Featured on VibeGameDB” badge to your site, GitHub README or itch.io page.
<a href="https://vibegamedb.com/en/games/cosmo-arena" target="_blank" rel="noopener" title="View Cosmo Arena on VibeGameDB – the database of AI-built games">
<img src="https://vibegamedb.com/badges/featured-light.svg" width="250" height="54" alt="Featured on VibeGameDB – Cosmo Arena, an AI-built game" />
</a>Similar games
