# Openings Mastermind vs Opening Prep

The clearest difference is update cadence: Opening Prep at every 4 days against Openings Mastermind's fortnightly. Opening Prep also leads on iOS requirement (16.6 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Openings Mastermind ships an update fortnightly, Opening Prep every 4 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | Openings Mastermind | Opening Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/openings-mastermind/id6448386251/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | Free | — |
| Size | 88 MB | 5 MB |
| Requires iOS | 18.6 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Christian Heise](https://appshunter.io/developer/1632898424) | [Roman Bogatenko](https://appshunter.io/developer/1896131806) |

## 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


### Opening Prep

[App page](https://appshunter.io/ios/app/opening-prep-chess-trainer/id6765937133)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Openings Mastermind free?

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

### Is Opening Prep free?

Opening Prep is free to download, with no in-app purchases.

### Do Openings Mastermind or Opening Prep have ads?

Neither Openings Mastermind nor Opening Prep shows ads.

### Which is updated more often, Openings Mastermind or Opening Prep?

Openings Mastermind ships an update fortnightly, and Opening Prep every 4 days. Most recently, Openings Mastermind was updated on October 24, 2026 and Opening Prep on October 24, 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.*