About Acid Ape Chess
Acid Ape Chess is the multi-purpose chess suite aimed at the serious player. Acid Ape Chess is organized with a tools philosophy in mind. You can leverage its modular design to perform common and less common chess-related...
Acid Ape Chess is the multi-purpose chess suite aimed at the serious player.
Acid Ape Chess is organized with a tools philosophy in mind. You can leverage its modular design to perform common and less common chess-related tasks.
Acid Ape Chess focuses on:
• quality;
• elegance;
• ergonomics;
• versatility.
Some
Acid Ape Chess features:
Online chess
• Play on FICS, ICC and Lichess
• Watch live online games
• View online players and their game history
• Non-disruptive in-game chat using a subwindow at the bottom of the chessboard
Chess engines
• Play against UCI or CECP chess engines
• Organize engine duels
• 3 strong builtin engines are provided (Arasan, cheng4 and Scorpio)
• Use third-party engines
• Adjust engine-specific settings
• Use custom PolyGlot (.bin) and Arena (.abk) opening books
• Use custom neural networks
Analysis
• Analyze with multiple chess engines
• Display the principal variation and stats
• Display an evaluation graph
• Display Syzygy 7-men EGTB results (uses an online service)
• Easily create, annotate and move variations with our move list editor
• Automatic analysis (apply the best move every x seconds)
• Auto annotate games using a chess engine and the endgame tablebases
• Advanced move indicators displaying engine evaluation scores
Premium access to our online database
• 260 million positions
• 4.5 million games, from the 1800s to 2025
• 330,000 OTB players, from club players to superstars
• Used by the opening explorer
• Can be used as an opening book for chess engines
• Search for players, display games, filter by ELO and opening
• Our database is updated continuously
• The perfect tools for your game preparation
PGN support
• Your played games are autosaved
• The PGN Explorer: a file manager with PGN support
• Edit your games (headers, move tree, annotations)
• Load and save PGN files
• Clipboard support
• Share your games as PGN download links
OTB chess
• Watch live games from major professional tournaments
• Search our online database for players and games
• Use a stylish fullscreen clock for your OTB games
• Play OTP (over the phone): two players on the same phone or tablet.
Electronic boards and clocks
• Drivers for the DGT Bluetooth e-Board, the DGT USB e-Board, the DGT Smart Board, the DGT Revelation II, the DGT3000 and the DGT Pi
• Play online, engine and OTB games with your physical board and clock
• Connect via Bluetooth or USB
Blindfold play
• The board and move list are hidden
• You input your moves via speech recognition
• Opponent moves are announced via speech synthesis
Tactical puzzles
• Solve 900 puzzles split into 3 levels of difficulty
• Import your own PGN puzzles
Simuls
• Challenge from 2 to 16 engine opponents
• Play blindfold simuls
A comprehensive user manual
• Explains everything about AAC, and more!
• Presented as a book, accessible from AAC
• Contains numerous use cases and tips
Extra features
• Play Chess960
• Choose from many different board and piece themes
• Enter local player details, with country flag, chess title and ELO
• Use the position editor to encode positions for playing or analysis
• Move speech recognition and synthesis
• A LCD chess clock modeled after real hardware, with sound and flag display
• Displays your personal statistics against your opponent
• Use a standalone clock app for your non-connected OTB games
This is
Acid Ape Chess Standard Edition , which only provides a subset of the listed features. For the full set, see
Acid Ape Chess Grandmaster Edition .
Previous Versions
Here you can find the changelog of Acid Ape Chess since it was posted on our website on 2016-11-08 20:02:52.
The latest version is 1.12.1 and it was updated on 2026-06-11 16:15:39. See below the changes in each version.
Acid Ape Chess version 1.12.1
Updated At: 2025-02-25
Changes: - A Lichess protocol change broke challenges: fixed.
- Miscellaneous fixes and improvements.
Acid Ape Chess version 1.12
Updated At: 2025-02-12
Changes: - Acid Ape Chess can now be installed on Android 13 and later.
- Arasan has been updated to 25.0.
- A few minor issues have been fixed.
Acid Ape Chess version 1.11.4
Updated At: 2023-07-02
Changes: - A Lichess protocol change broke Lichess support: fixed.
- Per-engine core settings are now respected again.
Acid Ape Chess version 1.11.3
Updated At: 2023-06-10
Changes: The DGT3000 driver is now more robust when faced with connection drops.
Acid Ape Chess version 1.11.2
Updated At: 2023-02-12
Changes: A Lichess protocol change broke Lichess support: fixed.
Acid Ape Chess version 1.9.1
Updated At: 2021-11-29
Changes: A few issues have been fixed.
Acid Ape Chess version 1.9
Updated At: 2021-11-22
Changes: - OTP mode ("over the phone") has been added: two players can now play against each other on the same phone or tablet, each on their own virtual chessboard.
- Open Exchange 2.0 is now supported (this restores the ability to run several third-party chess engine packages on Android 10 and later).
- Evaluation graph data is now precomputed and cached.
- Now handles automatic draws by fivefold repetition and by seventy-five-move rule.
- Miscellaneous fixes and improvements.
Acid Ape Chess version 1.8
Updated At: 2021-04-16
Changes: - In order to adhere to FIDE/USCF rules and to be consistent with the DGT3000, clock increments are now added to the initial game time.
- A problem which would affect Goi.bin and a few other PolyGlot opening books has been fixed.
- The orientation of the DGT board is now auto-detected.
- When challenging a player, you can now select an advanced time control.
- Arasan has been updated to 22.2.
- Miscellaneous fixes and improvements.
Acid Ape Chess version 1.7
Updated At: 2020-10-29
Changes: - Custom opening books are now supported: PolyGlot (.bin) and Arena (.abk).
- Engines can now be cloned (useful for having an engine duel itself with different settings).
- The evaluation graph has been improved.
- DGT move detection has been improved.
- Arasan has been updated to 22.1.
- A few minor issues have been fixed.
Acid Ape Chess version 1.6.1
Updated At: 2020-06-11
Changes: - Multiple engine best moves (aka MultiPv) can now be displayed (increase the "Principal variations" setting).
- Analysis can now be paused (long-press the "stop analysis" toolbar button).
- A Samsung bug affecting the main menu button has been worked around.
- Is compatible with the upcoming version of Chess Engines Collection.
- A few minor issues have been fixed.
