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Caldra key art · Steam store artwork

Caldra store artwork
Caldra key art · 1 / 5
Partially verifiedSteam

Caldra

A free online PvP deckbuilder where you trade cards for coins mid-match.

Developer
Dolphin Star · Solo
Release date
Price
FreePlayable now
Languages
EnglishEnglish, German, European Spanish, Ukrainian, European Portuguese, Romanian, Russian, Chinese (Simplified) +1 more
Officialas of Nov 3, 2026Steam

Steam store “Supported languages”.

Gameplay
DeckbuildingMultiplayer
Development method
AI-Assisted · Solo Developer
AI coding tools
CodexCursor
View on SteamAll ways to play ↓

Links go to the official store or developer page. Last verified Nov 3, 2026.

Where to play

Every platform this game is on. Links are checked against official sources; we never host or mirror games.

  • SteamReleasedFree

    Download through the Steam app. A free Steam account is required.

    Desktop · Steam

    View on Steam

About Caldra

A free-to-play competitive card game for Windows: in online PvP matches, players buy and sell cards with coins to shape their decks, and matches are best of three rounds. The solo developer, Dolphin Star, says in a Qiita devlog that they used AI coding tools such as Codex and Cursor, mainly to generate code for the Rust game server. The Steam AI disclosure lists card illustrations, localization text and some parts of the program code. It left Early Access on Steam on 2 November 2026.

pvpcard-battlerfree-to-playunity

How it was built

Partially verified
CodexPrimary

Named with Cursor in the developer's Qiita devlog. AI code generation was used mainly for the Rust server, including the lobby server, and AI also helped fix Unity engine bugs on the client. The devlog does not say which code each tool wrote.

Developer Reported非ゲーム系エンジニアだけどゲーム作ってSteamにリリースしてみた　第 4 回：AIの使い方
Supporting evidence
  • OfficialSteam AI disclosure lists "Some parts of the program code". — Steam
CursorSecondary

Named with Codex in the developer's Qiita devlog as an AI development tool used on the game; its specific role is not stated.

Developer Reported非ゲーム系エンジニアだけどゲーム作ってSteamにリリースしてみた　第 4 回：AIの使い方
Development approach

Solo project by an engineer who does not usually make games. Unity client and a Rust server; AI code generation was used mainly on the server side. The Steam AI disclosure also covers card illustrations and localization text.

Engine / framework
Unity
Languages
Rust
Team size
1 (solo)Developer ReportedDS_Seido (Qiita)
Development time
Not disclosed
Development cost
Not disclosed
AI-written code
Not disclosed

Verification notes: AI tools and server-side AI code from the developer's Qiita devlog (Japanese), which links this Steam page. Only part of the code is AI-written. Release dates, price, languages and AI disclosure from the Steam store page and API.

Development history

  1. Released in Early Access on Steam.

    OfficialSteam

  2. Developer publishes a devlog on using Codex and Cursor to build the game.

    DeveloperDS_Seido (Qiita)

  3. Full release on Steam.

    OfficialSteam

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.

Steam

ReleasedFreeStore page
Concurrent players
Observed
0
as of Nov 3, 2026Valve

Players online at our snapshot on 3 Nov 2026 from the Steam Web API. One reading, not a peak or a total.

All-time peak concurrent players
Not disclosed
Steam reviews
Observed
18
as of Nov 3, 2026Steam
Positive Steam reviews
Observed
66%
as of Nov 3, 2026Steam

Not publicly available: Estimated owners, Gross revenue.

Sales & revenue (all platforms)

Copies sold
Not disclosed

Reviews & rankings

Editorial review

Not yet reviewed by our editors.

Community rating
No community votes yet · ranking needs 25+ votes
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Ranking positions
Player reviews

No player reviews yet.

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Sources

SourceTypePublishedAccessed
Caldra on Steam
Steam
Store pageNot confirmedNov 3, 2026
非ゲーム系エンジニアだけどゲーム作ってSteamにリリースしてみた　第 4 回：AIの使い方
DS_Seido (Qiita) · Japanese
DevlogJun 9, 2026Nov 3, 2026
Steam Web API: current players (app 4452480)
Valve
Official siteNot confirmedNov 3, 2026
Verification: Partially verifiedLast verified: Nov 3, 2026OfficialDeveloperThird-PartyObservedUnverified
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