# Powerfish vs Chessvision.ai eBook Reader

The clearest difference is in-app purchases: Powerfish at none against Chessvision.ai eBook Reader's 2. Chessvision.ai eBook Reader's advantage is update cadence (monthly vs every 6 months) and iOS requirement (13.4 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. Chessvision.ai eBook Reader sells 2 in-app purchases, starting at $6.99 per month. Powerfish asks for nothing beyond the download.

Powerfish ships an update every 6 months, Chessvision.ai eBook Reader monthly. The most recent releases landed on September 18, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Powerfish | Chessvision.ai eBook Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (6 ratings)](https://appshunter.io/ios/app/chessvisionai-ebook-reader/id6599857782/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Monthly** |
| Monetization | — | Free with in-app purchases |
| Size | 36 MB | 47 MB |
| Requires iOS | 15.1 | **13.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Powerfish Ltd.](https://appshunter.io/developer/1727335488) | [Pawel Kacprzak](https://appshunter.io/developer/1574933455) |

## What reviewers say

### Powerfish

[App page](https://appshunter.io/ios/app/powerfish/id6476616059)

**In-app purchases:** none


### Chessvision.ai eBook Reader

[App page](https://appshunter.io/ios/app/chessvisionai-ebook-reader/id6599857782)

Transform chess eBooks into interactive learning tools. Instantly view board setups from diagrams with a double-tap. Organize your library, analyze positions with engines, and create study sheets.

**Highlights:** Interactive diagram analysis, Organize chess eBooks, Analyze with chess engines, Create PDF study sheets, Export to PGN, Search and filter diagrams, Discover related resources

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chessvision.ai eBook Reader | $6.99 | per month |
| Chessvision.ai eBook Reader | $49.99 | per year |


## Frequently asked questions

### Is Powerfish free?

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

### Is Chessvision.ai eBook Reader free?

Chessvision.ai eBook Reader is free to download, with in-app purchases available.

### Do Powerfish or Chessvision.ai eBook Reader have ads?

Neither Powerfish nor Chessvision.ai eBook Reader shows ads.

### Which is updated more often, Powerfish or Chessvision.ai eBook Reader?

Powerfish ships an update every 6 months, and Chessvision.ai eBook Reader monthly. Most recently, Powerfish was updated on September 18, 2026 and Chessvision.ai eBook Reader on September 14, 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.*