# Chess Acuity vs Chaal

The clearest difference is in-app purchases: Chess Acuity at none against Chaal's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Chaal sells 1 in-app purchase, starting at $2.99 per month. Chess Acuity asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on October 4, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Chess Acuity | Chaal |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | Every 4 days |
| Size | 135 MB | 14 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Sigfus Bjarnason](https://appshunter.io/developer/1896327101) | [Hisa Hashisaka](https://appshunter.io/developer/6772068208) |

## What reviewers say

### Chess Acuity

[App page](https://appshunter.io/ios/app/chess-acuity/id6788771638)

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

**In-app purchases:** none


### Chaal

[App page](https://appshunter.io/ios/app/chaal-chess-position-analyzer/id6796217523)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chaal Pro | $2.99 | per month |


## Frequently asked questions

### Is Chess Acuity free?

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

### Is Chaal free?

Chaal is free to download, with in-app purchases available.

### Do Chess Acuity or Chaal have ads?

Neither Chess Acuity nor Chaal shows ads.

### Which is updated more often, Chess Acuity or Chaal?

Chess Acuity ships an update every 4 days, and Chaal every 4 days. Most recently, Chess Acuity was updated on October 4, 2026 and Chaal on October 7, 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.*