The strongest, the best Go app in the world based on Crazy Stone employing Deep Learning technology !

Crazy Stone has made a huge step forward by combining Deep Neural Networks with Monte Carlo Tree Search.
The highest level of CrazyStone DeepLearning has achieved 5d in kgs rating !

We have provided an Analysis mode to review your games, and Rating mode to confirm your
progress. In CrazyStone DeepLearning, there are all the features you need to enjoy and improve
your game of Go !

* 20 levels of play from 15k to 5d
There are 20 levels of play (15k-5d) for all the board sizes.
Crazy Stone has improved not only in strength, but also in his style of play
and the lower levels are perfect for average players.

* Analysis Mode
You can analyze your current game and also game records saved in sgf files.
Use the analysis mode to review games and help improve your strength.
Move list, Histogram, Record analysis, Situation graph can be confirmed
with the analysis by Crazy Stone.

* Rating Mode
We have provided a Rating Mode.
You can confirm the results of games played and the history of your rating.

* Export and import sgf game files
You will be able to import and load game records in sgf format.
Please use CrazyStone DeepLearning to review and analyze Go games.
If you save games in DL format, the results of the record analysis will also be saved in the file.

* Other features

・Friendly 3 input methods
You can choose from 3 options of input methods (Zoom, Cursor & Touch).

・20 levels of play for each board size (9x9, 13x13, 19x19)

・Human vs Computer, Human vs Human (sharing a single device)

・Computer vs Computer Games

・Handicap games, variable options of Komi

・Hint (suggest)

・Instant Undo (available even when the computer is thinking)

・Automatic territory calculation

・Japanese/Chinese Rules

・Suspend/Re-start games

・Save/Load game record in sgf files

・Automatic and manual replay of a game record

・Highlight the last move

・COM resign feature

・Byoyomi games
(You will not be able to select computer level in timed games)

・Atari warning

・Highlight the last move

・Landscape mode

What’s New

Version 1.1.4

fixed some minor problems.

Ratings and Reviews

4.3 out of 5
15 Ratings

15 Ratings

frandad729 ,

About import/export ...

I hesitated buying this for quite a while because of the negative reviews, especially regarding the SGF import/export capability. But I finally took a chance and am happy to say that they have fixed all of those issues. You can copy and paste to/from the clipboard to exchange games with other apps, export via email, load/save from iCloud and Dropbox (and probably other cloud drive apps, those are the only ones I tested), and it also works as an “Open with ...” target for other things like email attachments and web links.

I’d recommend trying the free version of CrazyStone first and seeing if it works for you because the import/export features are the same there. The Pro version adds Analysis mode and Rating mode (which tracks your rating separately for 9x9, 13x13 and 19x19) and removes the ads found in the free version. As others have noted, the UI isn’t the greatest in the world, but it is functional when you get used to it.

Even though it is quite expensive, I’m happy with the purchase, and it is at least much more affordable than the Steam version.

Bobbybob32134282 ,

It just beat leela 0.11.0

This app, running on my smart phone, somehow just beat leela 0.11.0 running on my pc (the strongest program I thought I had... leela quickly and easily defeats amateur 4 dan humans, and I’m guessing it’s at least amateur 7 dan)... maybe it found some sort of shape misunderstanding in leela but I’m still looking into it. This was the first time I tried this experiment, so I’ll be sure to try again, but it seems like this app either got *much* stronger, or it got very lucky (several times). Leela had a better opening, but CS came back crushed it in the end game... anyways that result just blew my mind and I had to immediately give it a 5-star review. Keep up the good work. Maybe in the not-so-distant future we’ll all have superhuman go masters in our pockets

Update: just beat leela again. There was 4 ko fights going on simultaneously and it was a very complex game. Leela only had a slight lead in the opening this time, but CS quickly came back with an extremely strong middle and end game. It is very sharp. This app is no joke, I honestly can’t believe it’s this strong given the hardware and time restrictions. It looks like the neural networks have been significantly improved, though I see no mention of such an update. It’s definitely much stronger than 5 dan. Feels like 9 dan or stronger (but it did lose to a 2-dan opponent... I assume it must make a pretty significant mistake every once in a while).

m+m ranch ,

Needs file association for sgf files

It shouldn't be so hard to open an sgf file with this app. Do a Google search for iOS file association.


Unbalance Corporation
53.8 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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