# Chess Opener PRO vs Sumzy

The clearest difference is price: Sumzy at Free against Chess Opener PRO's $8.99. Chess Opener PRO's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 26.2). On ads and in-app purchases there is nothing between them.

Sumzy is free to download; Chess Opener PRO costs $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Chess Opener PRO | Sumzy |
| --- | --- | --- |
| Price | $8.99 | **Free** |
| Rating | **[4.4 (79 ratings)](https://appshunter.io/ios/app/chess-opener-pro/id1489282483/reviews)** | — |
| Number of ratings | **79** | — |
| Positive reviews | 75.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | — |
| Monetization | Paid | — |
| Size | 149 MB | 3 MB |
| Requires iOS | **15.1** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Stanislav Basovnik](https://appshunter.io/developer/1469334974) | [TOONATEK SRL](https://appshunter.io/developer/1878717691) |

## What reviewers say

### Chess Opener PRO

[App page](https://appshunter.io/ios/app/chess-opener-pro/id1489282483)

Master chess openings with a comprehensive trainer and explorer. Analyze grandmaster repertoires, build your own opening lines, and memorize variations with interactive training. Works offline with no ads.

**Highlights:** Chess opening tree with statistics, Encyclopedia of Chess Openings (ECO), Grandmaster repertoire database, Stockfish engine analysis, Interactive opening trainer, Build and manage opening repertoire, PGN import/export

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

**In-app purchases:** none

**What reviewers like**

- 👍 Excellent for learning openings
- 🚀 Fast and responsive
- 💡 Highly customizable repertoires
- 👍 Intuitive and easy to use
- 👍 Great for serious players

**What reviewers complain about**

- 🐛 Crashes quite often
- 🐛 Not intuitive to use
- 🐛 Invalid PGN import
- 🐛 Does not train beyond opening position
- 🐛 Repeats same variation

**Reported bugs**

- Invalid PGN import
- Crashes quite often
- Repeats same variation
- Cannot review lines while training
- App not functioning with iOS 16.7.4

**Requested features**

- Include position setting
- Start study from a later position
- Multiple folders for simultaneous practice
- Option to switch between figure visibility modes (normal, queen pieces, none)
- Blindfold practice option


### Sumzy

[App page](https://appshunter.io/ios/app/sumzy/id6761391242)

**In-app purchases:** none


## Frequently asked questions

### Is Chess Opener PRO free?

Chess Opener PRO costs $8.99, with no in-app purchases.

### Is Sumzy free?

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

### Do Chess Opener PRO or Sumzy have ads?

Neither Chess Opener PRO nor Sumzy shows ads.

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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.*