# ChessPrep vs OpenChess

The clearest difference is rating: OpenChess at 5.0 against ChessPrep's 3.0. ChessPrep's advantage is update cadence (every 3 days vs fortnightly). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. ChessPrep sells 3 in-app purchases, starting at $0.99 per month and OpenChess sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

OpenChess holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

ChessPrep ships an update every 3 days, OpenChess fortnightly. The most recent releases landed on June 11, 2026 and August 30, 2026 respectively.

## The numbers

| Metric | ChessPrep | OpenChess |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/chessprep/id6469808213/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/openchess-an-opening-explorer/id6504700904/reviews)** |
| Number of ratings | 2 | 2 |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Fortnightly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 109 MB | 57 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Stephen Papadatos](https://appshunter.io/developer/1712680449) | [David Bryant](https://appshunter.io/developer/1559648957) |

## What reviewers say

### ChessPrep

[App page](https://appshunter.io/ios/app/chessprep/id6469808213)

Enhance your chess strategy with a powerful companion app. Build your repertoire from grandmaster moves, analyze opponent responses, and master tactics using a strong chess engine and spaced repetition.

**Highlights:** Build repertoire from grandmaster moves, Analyze opponent responses by elo, Stockfish 16 chess engine, Spaced repetition system, Position analysis and variation calculation

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ChessButler Monthly Sub | $0.99 | per month |
| ChessButler Yearly Sub | $9.99 | per year |
| ChessButler Lifetime Premium | $19.99 | one-time |


### OpenChess

[App page](https://appshunter.io/ios/app/openchess-an-opening-explorer/id6504700904)

Master chess openings by playing against a specialized AI. Explore specific defenses or move sequences, and gain insights into positional advantages and piece values. Improve your game from the very first moves.

**Highlights:** Learn specific chess openings, Play against AI focused on opening lines, Analyze positional advantages, Evaluate piece values and mobility, Understand pawn structure, Track defended and attacked pieces

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tarrasch Defense Opening | $0.99 | one-time |
| Trompowsky Attack Opening | $0.99 | one-time |
| Scandinavian Defense Opening | $0.99 | one-time |
| Three Knights Opening | $0.99 | one-time |
| Zukertort Opening | $0.99 | one-time |
| Van't Kruijs Opening | $0.99 | one-time |
| Vienna Game Opening | $0.99 | one-time |
| Ware Opening | $0.99 | one-time |
| Opening Explorer | $4.99 | one-time |
| OpenChess Premium | $19.99 | one-time |


## Frequently asked questions

### Is ChessPrep free?

ChessPrep is free to download, with in-app purchases available.

### Is OpenChess free?

OpenChess is free to download, with in-app purchases available.

### Which has better reviews, ChessPrep or OpenChess?

OpenChess is rated higher. ChessPrep averages 3.0 out of 5 from 2 ratings, while OpenChess averages 5.0 from 2 ratings.

### Do ChessPrep or OpenChess have ads?

Neither ChessPrep nor OpenChess shows ads.

### Which is updated more often, ChessPrep or OpenChess?

ChessPrep ships an update every 3 days, and OpenChess fortnightly. Most recently, ChessPrep was updated on June 11, 2026 and OpenChess on August 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*