Acid Ape Chess GM Edition

In-app purchases
237 reviews
Content rating
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About this game

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


• 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

• 210 million positions
• 3.6 million games, from the 1800s to 2022
• 270,000 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


• 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 Grandmaster Edition, containing all the features.

* DGT drivers are the only optional purchase inside the application. We have set an unique worldwide base price for this optional feature, in €. The final price is fixed by Google Play and varies depending on local taxes, VAT, and currency exchange rates. To give you an idea, it is 59.99 € (VAT included) in Germany.
Updated on
May 22, 2022

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
App activity and Device or other IDs
This app may collect these data types
App activity and App info and performance
Data is encrypted in transit
Data can’t be deleted
237 reviews
A Google user
March 9, 2019
There is potential here, but for the price, this is disappointing. For one thing, they should make it clear that they are charging an additional $50 for DGT drivers. The other hugely annoying thing for me is that the only available time controls are sudden death, with or without increment. You can't set one time control for the engine, and a different one for the engine. And when the flag falls, it won't keep playing. So if you want a time handicap against Stockfish, tough luck.
35 people found this review helpful
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Acid Ape Studios
March 9, 2019
Please read the user manual. :) All the things you describe are covered in there.
Michele Tumbarello
July 30, 2022
Hands down best app for chess, especially to arrange engine's matches. Nevertheless I miss some options, one might be an artificial delay to show moves after actual calculation
1 person found this review helpful
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Acid Ape Studios
September 20, 2022
Appreciated, thanks!
Chris Pop
October 24, 2020
Good app, despite being expensive. It has many features not found elsewhere. The voice command is quite accurate, easy to use and it works even on Offline mode (if you downloaded the language offline for Google Voice). COULD YOU PLEASE ADD THE FOLLOWING FEATURE: Could you add please the possibility that the top half screen shows the board and the bottom half shows the clock and the moves can be made either manually by touching squares on the board (top half) or made by voice command by touching ANYWHERE on the clock area (i.e. the bottom half of the screen). At the moment the closest to this option is when not on blindfold and the "Move list" bottom half is shown but the microphone icon is very small. My proposed option would allow the voice command (by simply touching anywhere on the bottom half screen) whilst still showing the board (on the top half screen). I do have an issue: when adding new chess engines, the app reloads chess engines list everytime the screen is modified.
7 people found this review helpful
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What's new

- Engines can now use custom data files. This is useful for using a custom neural network with engines such as Arasan, Stockfish or Lc0.
- A node limit can now be specified in the engine settings dialog. This uses the UCI "go nodes" command and is useful for making Maia deterministic.
- The Play dialog now features a recent games list. Moreover, the logic which determines and remembers default values has been improved.
- Arasan has been updated to 23.3.
- Miscellaneous fixes and improvements.