# Chess Opening Blunders vs Chess Prep Pro Openings

The clearest difference is ads: Chess Opening Blunders at none against Chess Prep Pro Openings's shown. Chess Opening Blunders also leads on rating (4.7 vs 4.5) and ratings volume (247 vs 22). Chess Prep Pro Openings's advantage is update cadence (fortnightly vs every 2 months). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Chess Opening Blunders sells 1 one-off in-app purchase and Chess Prep Pro Openings sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Chess Opening Blunders holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Chess Opening Blunders has 247 ratings behind it against 22, 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 75% of Chess Prep Pro Openings's.

Chess Opening Blunders ships an update every 2 months, Chess Prep Pro Openings fortnightly. The most recent releases landed on October 21, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Chess Opening Blunders | Chess Prep Pro Openings |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (247 ratings)](https://appshunter.io/ios/app/chess-opening-blunders/id1129867864/reviews)** | [4.5 (22 ratings)](https://appshunter.io/ios/app/chess-prep-pro-openings/id1606629475/reviews) |
| Number of ratings | **247** | 22 |
| Positive reviews | **84.1% of reviews** | 75.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 43 MB | 214 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chess King](https://appshunter.io/developer/1096660597) | [Tomasz Bogun](https://appshunter.io/developer/1502902123) |

## 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 |


### Chess Prep Pro Openings

[App page](https://appshunter.io/ios/app/chess-prep-pro-openings/id1606629475)

Master chess openings by building custom repertoires and training your memory. Analyze opponent moves, discover blind spots, and utilize an advanced engine for in-depth preparation. Expand your knowledge with downloadable repertoires and import/export PGNs.

**Highlights:** Custom chess opening repertoires, Repertoire training and memory sharpening, Blind spot finder against player games, Chess openings player database, Advanced StockFish engine analysis, Downloadable and importable repertoires

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly premium subscription | $3.99 | per month |
| Yearly premium | $24.99 | per year |
| Lifetime Premium | $59.99 | one-time |


## Frequently asked questions

### Is Chess Opening Blunders free?

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

### Is Chess Prep Pro Openings free?

Chess Prep Pro Openings is free to download, with in-app purchases available.

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

Chess Opening Blunders is rated higher. Chess Opening Blunders averages 4.7 out of 5 from 247 ratings, while Chess Prep Pro Openings averages 4.5 from 22 ratings.

### Do Chess Opening Blunders or Chess Prep Pro Openings have ads?

Chess Prep Pro Openings shows ads; Chess Opening Blunders does not.

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

Chess Opening Blunders ships an update every 2 months, and Chess Prep Pro Openings fortnightly. Most recently, Chess Opening Blunders was updated on October 21, 2026 and Chess Prep Pro Openings on October 19, 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.*