Diamond Chess Online

Diamond Chess Online

Online or Computer Play

5 ratings
8 reviews

Archived App (Last seen on 7 Jul 2026)

This is an archived listing of the app previously available on the App Store.

Although the app is no longer distributed by Apple, you can still view its description, screenshots, version history, ratings, and metadata for reference.

Details

  • Released
  • Updated
Diamond Chess Online screenshot #1 for iPhone
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iphone
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About

Play chess online or offline against computer engines and variants. Features an opening explorer with a large game database and analysis tools. Offers accessibility features for visually impaired users.

โœ“Online and offline play
โœ“Multiple chess variants (Chess960, Crazyhouse, etc.)
โœ“Opening explorer with game database
โœ“Engine analysis
โœ“Accessible board for visually impaired
โœ“Save and review played games
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What's New in Diamond Chess Online

2.20

August 29, 2025

Increased explorer opening book database by 295k games

User reviews

My preferred Chess GUI

Iโ€™ve been using Diamond Chess for years on my Mac, and have found the developer very responsive. Recommended!

Fantastic chess app

1) Sign up for free on FICS

2) login on the app.

3) enjoy!

Between this app, SmallFish, and Chesstree, I feel like thereโ€™s a fresh start with playing chess electronically. I got sick of the bloat of chess dotcom and the politics of Lichess. Here, I can final,y be back to basics. FICS is a lot of fun, and is a great way to keep playing chess.
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Diamond chess online

The one I use for internet chess. User friendly and works great with a Mac, for whom some sites do not have many interfaces.

Awesome.

Was very happy to find this app in the store. I appreciate the dev making this free with no ads. Too kind โœŒ๏ธ

Very complete Fics/ICC interface.

Unlike most mobile FICS/ICC interfaces this has a console, which is key to exploiting the servers full features. Necessary for any serious FICS interface, in my opinion. A list of sought games would be nice and when I set seeks ro โ€˜1โ€™ I donโ€™t see them in the console for some reason? Otherwise very full featured app for serious online chess players!
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Response from developer

Thanks for your review. The seeks are going to a seek graph. You can get to it by going to the board's option button at top then "Find a game"

Developer apps

FAQ

Does Diamond Chess Online have ads?

No, Diamond Chess Online is ad-free, allowing for an uninterrupted gaming experience.

Can I play Diamond Chess Online offline?

Yes, you can play against the Pulsar Engine and use the Explorer offline. Online play requires an internet connection.

What chess variants does Diamond Chess Online support?

Diamond Chess Online supports Chess960, Crazyhouse, Losers, Atomic, and Giveaway/Suicide variants, in addition to standard chess.

Is Diamond Chess Online free to play?

Yes, Diamond Chess Online is completely free to download and play. The FICS server accounts are also free.

How does Diamond Chess Online help visually impaired players?

The app features an accessible board that works with Voice Over, speaking square contents and moves to assist visually impaired users.

What is the Explorer feature in Diamond Chess Online?

The Explorer is an offline feature that provides an opening tree based on over 640,000 rated games, allowing for analysis and study of openings.

Can I play rated games on Diamond Chess Online?

You can play unrated games as a guest on FICS. For rated games, you can sign up for a free FICS account via the provided link.

How often is Diamond Chess Online updated?

The latest version is 2.20, last updated on August 29, 2025, indicating active development and regular updates.