Chess Lab: Arasan AI Engine

Online multiplayer & analysis

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

Chess Lab: Arasan AI Engine combines a world-class chess engine with a beautiful, intuitive interface. Whether you are a beginner looking to improve or an advanced player seeking serious analysis and competitive matches, this app brings everything together in one place. ▪ Play Instantly with “Web Invite” • No need to ask friends to download the app or create an account. • Generate an invite link, send it, and they can join instantly from any smartphone or PC browser. ▪ Versatile Game Modes • Online Multiplayer: Compete against players worldwide and climb the global leaderboards. • Web Invite Play: Seamless private matches via URL. • Offline CPU Battles: Train against the powerful Arasan AI with 40 adjustable strength levels. • Local 2-Player: Play face-to-face on a single device. ▪ In-Depth Analysis & Replays • Powered by Arasan: Built-in robust UCI engine delivers highly accurate evaluations and best-move calculations. • Real-Time Evaluation: Monitor the advantage bar and centipawn score/graph during your game. • Interactive History: Replay matches with step-by-step playback, fast-forward, and instant position jumping. • Visualized Insights: Automatically highlights significant evaluation drops (blunders) and color-codes long-thinking moves (Red/Yellow). ▪ Premium Board Experience • 2.5D & 2D Views: Switch between an immersive 2.5D perspective and a classic flat board. • Assistive Highlights: Clearly displays legal moves, captures, and checks to help prevent mistakes. • Full Promotion Support: Choose Queen, Rook, Bishop, or Knight when your pawn reaches the final rank. • Suspend & Resume: Automatically saves unfinished games so you can continue later. • Tactile Feedback: Smooth animations paired with high-quality haptics for a satisfying feel.

Ratings & Reviews

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Added castling support.

Version 2.0.6

The developer, koji ozono, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Identifiers

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Identifiers
    • Usage Data

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • koji ozono
Size
  • 62.9 MB
Category
  • Board
Compatibility
Requires iOS 17.6 or later.
  • iPhone
    Requires iOS 17.6 or later.
  • iPad
    Requires iPadOS 17.6 or later.
  • Mac
    Requires macOS 14.6 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.3 or later.
Languages
  • English and Japanese
Age Rating
4+
In-App Purchases
Yes
Copyright
  • ©2026 Koji Ozono
  • Developer Website
  • Privacy Policy
  • License Agreement

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