Arkon: Chess Opening Explorer 4+

Free Offline Stockfish Engine

Avniel Apps LLC

Designed for iPad

    • 4.5 • 214 Ratings
    • Free
    • Offers In-App Purchases



Build an opening repertoire with uncharted variations using the power of the strongest chess engine and the wisdom of chess grandmasters


- Offline implementation — Arkon does not use cellular data

- Moves scored by powerful Stockfish chess engine in centipawns (cp)

- Move popularity from Chess Grand Master games (ELO 2600+)

- Game PGN chess position display and export via email

- Opening Lines from Encyclopedia of Chess Openings (ECO)


Arkon is free to download and use. However, should you desire to explore chess openings beyond the first 20 positions, you can unlock a full version as follows:

3-Month Unlimited Moves: USD 0.99

1-Year Unlimited Moves: USD 2.99

Lifetime Unlimited Moves: USD 8.99

All of these purchase items have unrestricted access to explore openings regardless of move depth

What’s New

Version 3.0.3

- minor updates & bug fixes

Ratings and Reviews

4.5 out of 5
214 Ratings

214 Ratings

jholmes2635 ,

Great for double-checking old books

I’ve used this app with great success and joy when playing out some of the moves from older chess books from the 1940’s, 50’s, and 60’s. Every now and then the app helps me find a mistake in these old books. I do wish it had better game info, and I only give it four stars because it has encountered an error a few times near the end of a game, resulting in a need to reset (and lose) the game. Other than this, it’s a great app with a seriously deep engine. Has helped me improve leaps and bounds.

MstrDice ,

You get 9 moves free

And for that, I think it’s the best free option out there. I agree with other users that it would be nice to see cumulative vs individual cp scores, but otherwise I love building my own opening, seeing what it’s named, and practicing a few options before playing a real game. For a ~1500 player like me, 9 moves is plenty. After that, I can buy the upgrade or read a book.

SolarKnight007 ,

Only 1 flaw

This app is incredible and one of the best ways to explore openings. The only thing I wish it had is the ability to see the cumulative position score as the opening proceeds. This could be calculated by summation of the centipawn values for each move, but I feel like this is something that could easily be calculated and displayed by the app itself. Otherwise, this app is near perfect (and free!)

App Privacy

The developer, Avniel Apps LLC, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.

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