# OpeningTree - Chess Openings — Analyze Chess Moves and Games

> Chess opening explorer with engine analysis and game import. (iPhone/iPad app by Michael Adams.)

- Source: https://appshunter.io/ios/app/openingtree-chess-openings/id882614935 (this page in markdown: same URL + `.md`)
- Developer: [Michael Adams](https://appshunter.io/developer/743520896)
- Category: Games, Board
- Price: $0.99 (on sale, was $2.99)
- Rating: 4.40/5 from 31 App Store ratings · 23 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 53 MB
- Languages: French (France), German (Germany), American English, European Spanish, Italian
- Released: 2014-06-06
- Data updated: 2026-09-07
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/openingtree-chess-openings/id882614935/reviews.md

## What is OpeningTree?

OpeningTree is a chess openings book based on high rated over the board games that lets one explore the tree of openings and engine analysis is available. Chess game files can be shared with the app to check against the book or to just view. Users can make their own side line moves and back up to return to main line.  Also includes ten classic game collections and users can import their own games into the app. Game list are also searchable by tags. 

The updated opening book is compiled from 640,000 high rated games from recent years with both players rated 2300 and over. Just touch moves in the list or make moves on the board to see what the response is. The numbers next to moves indicate how many games resulted in wins-draws-losses. The idea comes from computer opening books as if we can open up the book and see what those moves are that people play in response to opening positions. Users do not pick an opening to study but start with the full tree.  

The analyze button on bottom right of board is to flip between viewing the openings move table or seeing Crafty engine analysis. +1.00 score means white is ahead a pawn. -1.00 score means black is ahead a pawn. There is a move now button to make the engine play the current best move if the users wants to try playing a position out against the engine.

OpeningTree's board is accessible to the blind and visually impaired using Voice Over.  With Voice Over enabled in device settings, tap on a square for info, double tap to select. Or choose from three move methods.  When going forward in a loaded PGN game, moves will be announced on each tap of the forward button. 

Moves can be marked with colors(red, green, yellow) and colorizing a move at the end of a line will extend the line i.e. add move so it shows later. There is also an option to make a note on a  position using the control bar.

In the Actions menu if the user has imported a chess games file to the App, for example by opening a PGN file  with OpeningTree from a mail attachment or download(long touch on the attachment/download for this option), a game from a PGN file can be loaded and checked against the book. If a user makes a new move, back up to the main line to return to the game. To ensure speed, it will only read/load a max of 5000 games. With bigger files users will only see first 5000 games.

There is a Save Board to PGN option on the Actions menu. It saves the current moves to openings-user-games.pgn, a file OpeningTree will create on first save. Games are saved with opening name as white and black name to spot the lines in each game. This allows the users to export data out of the App such as favorite lines with the mail games option when looking at a game list. 

The App comes with six PGN game files that can be optionally installed when no PGN files have yet been opened by the App or the user has deleted their PGN files previously opened and likewise has none to access. If this is the case, this option shows when going to Actions -> load PGN.  The files contain a mix of famous classical games, collections of former world champions Gary Kasparov and Magnus Carlsen's games and more recent games from two top ranked  international tournaments.

PGN stands for portable game notation. It's a file extension that can be used with text files that contain chess games in the PGN format. PGN files can be read by apps to display the games in them. If a game is loaded in the App one can then go to 'Actions -> show game data' to view the raw PGN text.

## Key features

- Extensive opening book
- Crafty engine analysis
- Load and analyze PGN games
- Create custom move lines
- Accessible for visually impaired
- Mark moves with colors
- Save board to PGN

## Recent user reviews (10 of 23)

All indexed reviews: https://appshunter.io/ios/app/openingtree-chess-openings/id882614935/reviews.md

### 1/5 — Do not buy

*2025-11-09*

Horrible and buggy game. Do not make my mistake by buying this game. Trust me, you’ll regret it.

### 4/5 — Be perfect if it also labeled the opening name

*2024-12-18*

Great app, but please provide the names of the openings

### 5/5 — It’s stable and does what it says

*2024-11-15, version 2.06*

Exactly as described - a chess opening explorer. It works and I am learning heaps from it.

### 5/5 — Great app

*2023-07-20*

I use this app to help learn chess moves… I wish however it could tell me what the actual openings were called and the defenses I play so I can better get a grasp on what I’m playing and my play style!!

### 5/5 — Indispensable

*2023-04-04*

Une application indispensable pour tout ceux qui veulent travailler leurs ouvertures aux échecs.
Gratuit et sans pub (non non aucune), permet de regarder les ouvertures déjà jouées.
Très bonne appli

### 5/5 — It’s great

*2022-09-01*

When I come back from my tournament then I can analyze it so that I can see how good or bad I played

### 4/5 — Label all columns

*2022-01-16*

Very useful app, but you need to label all of the columns in the move table. If that number to the far right is a percentage, I need to know what is it the percentage of?!

**Developer response:** Hi. if there are a total of 10 games on a row and 2 are wins, 6 are draws and 2 are losses, the points scored are 2 for the wins, at a half point each, 3 for the draws, so a total of 5/10. percentage is .50 or 50% win ratio

### 3/5 — Is O.K.

*2021-10-13*

… usability improvement would be nice.

### 4/5 — Nice app with good analysis

*2021-07-22, version 2.00*

Please add a feature like arrow button to just press it for move that analysis movements its easier to use thank you.

### 5/5 — Simple and super useful

*2021-07-15*

Very nice, simple. Does exactly what I was looking for. I hope the author will expand its features!

## Frequently asked questions about OpeningTree

### What is OpeningTree's opening book based on?

OpeningTree's opening book is compiled from 640,000 high-rated games from recent years, featuring players rated 2300 and over. This ensures the opening data is relevant and reflects top-level play.

### Can I play against the engine in OpeningTree?

Yes, OpeningTree allows you to play against the Crafty engine. You can use the 'move now' button to have the engine play the current best move, enabling you to practice playing out positions.

### How does OpeningTree support visually impaired users?

OpeningTree is accessible to the blind and visually impaired using Voice Over. Users can tap squares for information and double-tap to select, with three different move methods available.

### What is the price of OpeningTree?

OpeningTree is a paid app, priced at $0.99. This one-time purchase grants you access to all its features for analyzing chess openings and games.

### How often is OpeningTree updated?

OpeningTree was last updated on August 26, 2025, with version 2.30. This indicates active development and ongoing improvements to the application.

### Can I import my own chess games into OpeningTree?

Yes, you can import PGN files into OpeningTree, for example, from email attachments or downloads. The app can load and check these games against its opening book, with a limit of 5000 games per file for speed.

### What are the main advantages of using OpeningTree over other chess apps?

OpeningTree stands out with its massive, up-to-date opening book derived from high-rated games, integrated Crafty engine analysis, and robust accessibility features for visually impaired users. It also allows for detailed customization of move lines.

### What age rating does OpeningTree have?

OpeningTree has an age rating of 4+. This makes it suitable for a wide range of users, from young chess enthusiasts to experienced players.

## Version history (last 5 releases)

### 2.70 — 2026-06-28

When viewing game lists, can now filter games by search term

### 2.60 — 2026-05-13

Fix for formatting of opening book on numbers greater than 100,000
Added two classic game collections to the existing, Botvinnik and Karpov. Users who have already installed the extra PGN/games can delete it and have the option to reinstall with the new collections.

### 2.30 — 2025-08-26

Increased opening database by 100K newer games
"Save Board to PGN" option now writes in standard PGN format not algebraic

### 2.25 — 2025-08-05

Increased opening database by 195K newer games

### 2.06 — 2023-08-27

Added Carlsen and Morphy1858 PGN game collections to the classic games.  Existing users who delete their extra games will get a chance to get PGN games again and get the new ones.

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All apps by Michael Adams: https://appshunter.io/developer/743520896

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-07.*