# Openings Mastermind vs ChessPrep

The clearest difference is rating: Openings Mastermind at 4.3 against ChessPrep's 3.0. Openings Mastermind also leads on in-app purchases (none vs 3) and review sentiment (50% vs 33%). ChessPrep's advantage is update cadence (every 3 days vs fortnightly) and iOS requirement (12.0 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. ChessPrep sells 3 in-app purchases, starting at $0.99 per month. Openings Mastermind asks for nothing beyond the download.

Openings Mastermind holds the better App Store score, 4.3 against 3.0. Both are backed by a comparable volume of ratings — 6 and 2 respectively. Written reviews point the same way: 50% of Openings Mastermind's written reviews are positive against 33% of ChessPrep's.

Openings Mastermind ships an update fortnightly, ChessPrep every 3 days. The most recent releases landed on September 19, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | Openings Mastermind | ChessPrep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/openings-mastermind/id6448386251/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/chessprep/id6469808213/reviews) |
| Number of ratings | **6** | 2 |
| Positive reviews | **50.0% of reviews** | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 3 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 88 MB | 109 MB |
| Requires iOS | 18.6 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Christian Heise](https://appshunter.io/developer/1632898424) | [Stephen Papadatos](https://appshunter.io/developer/1712680449) |

## What reviewers say

### Openings Mastermind

[App page](https://appshunter.io/ios/app/openings-mastermind/id6448386251)

Master chess openings with this app. Import studies, explore with advanced engines, and practice specific lines through repetition. Track your progress and improve your game.

**Highlights:** Import Lichess Studies or PGNs, Explore openings with Stockfish 15, Practice openings by repetition, Smart practice queue, Track learning progress

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Openings Mastermind free?

Openings Mastermind is free to download, with no in-app purchases.

### Is ChessPrep free?

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

### Which has better reviews, Openings Mastermind or ChessPrep?

Openings Mastermind is rated higher. Openings Mastermind averages 4.3 out of 5 from 6 ratings, while ChessPrep averages 3.0 from 2 ratings.

### Do Openings Mastermind or ChessPrep have ads?

Neither Openings Mastermind nor ChessPrep shows ads.

### Which is updated more often, Openings Mastermind or ChessPrep?

Openings Mastermind ships an update fortnightly, and ChessPrep every 3 days. Most recently, Openings Mastermind was updated on September 19, 2026 and ChessPrep on June 11, 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.*