# Chess Opening Blunders vs Openings Mastermind

The clearest difference is in-app purchases: Openings Mastermind at none against Chess Opening Blunders's 1. Openings Mastermind also leads on update cadence (fortnightly vs every 2 months). Chess Opening Blunders's advantage is review sentiment (84% vs 50%) and rating (4.7 vs 4.3). On price, ads and device support there is nothing between them.

Both are free to download. Chess Opening Blunders sells 1 one-off in-app purchase. Openings Mastermind asks for nothing beyond the download.

Chess Opening Blunders holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: Chess Opening Blunders has 246 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 84% of Chess Opening Blunders's written reviews are positive against 50% of Openings Mastermind's.

Chess Opening Blunders ships an update every 2 months, Openings Mastermind fortnightly. The most recent releases landed on September 28, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Chess Opening Blunders | Openings Mastermind |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (246 ratings)](https://appshunter.io/ios/app/chess-opening-blunders/id1129867864/reviews)** | [4.3 (6 ratings)](https://appshunter.io/ios/app/openings-mastermind/id6448386251/reviews) |
| Number of ratings | **246** | 6 |
| Positive reviews | **84.1% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 43 MB | 88 MB |
| Requires iOS | **8.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Chess King](https://appshunter.io/developer/1096660597) | [Christian Heise](https://appshunter.io/developer/1632898424) |

## What reviewers say

### Chess Opening Blunders

[App page](https://appshunter.io/ios/app/chess-opening-blunders/id1129867864)

Learn chess by studying common opening mistakes and traps. This app offers interactive lessons with over 1,250 exercises across more than 40 openings, acting as a personal coach to guide you through challenges.

**Highlights:** Learn opening mistakes and traps, Over 1,250 instructive exercises, Covers more than 40 chess openings, Interactive lessons with hints and explanations, Play positions against the computer, Monitors player rating (ELO)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full course | $12.99 | one-time |


### 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


## Frequently asked questions

### Is Chess Opening Blunders free?

Chess Opening Blunders is free to download, with in-app purchases available.

### Is Openings Mastermind free?

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

### Which has better reviews, Chess Opening Blunders or Openings Mastermind?

Chess Opening Blunders is rated higher. Chess Opening Blunders averages 4.7 out of 5 from 246 ratings, while Openings Mastermind averages 4.3 from 6 ratings.

### Do Chess Opening Blunders or Openings Mastermind have ads?

Neither Chess Opening Blunders nor Openings Mastermind shows ads.

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

Chess Opening Blunders ships an update every 2 months, and Openings Mastermind fortnightly. Most recently, Chess Opening Blunders was updated on September 28, 2026 and Openings Mastermind on September 19, 2026.

---

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