# Chess.clock vs CalculatorZ

The clearest difference is ads: Chess.clock at none against CalculatorZ's shown. Chess.clock also leads on update cadence (every 3 months vs every 7 months). CalculatorZ's advantage is iOS requirement (15.0 vs 26.2). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Chess.clock ships an update every 3 months, CalculatorZ every 7 months. The most recent releases landed on October 15, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Chess.clock | CalculatorZ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 3 months** | Every 7 months |
| Size | 2 MB | 131 MB |
| Requires iOS | 26.2 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lukas Paul Hering](https://appshunter.io/developer/1788259541) | [Mekouar Ilyas](https://appshunter.io/developer/1757167856) |

## What reviewers say

### Chess.clock

[App page](https://appshunter.io/ios/app/chessclock/id6740070517)

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

**In-app purchases:** none


### CalculatorZ

[App page](https://appshunter.io/ios/app/calculatorz-math-puzzle/id6740878796)

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

**In-app purchases:** none


## Frequently asked questions

### Is Chess.clock free?

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

### Is CalculatorZ free?

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

### Do Chess.clock or CalculatorZ have ads?

CalculatorZ shows ads; Chess.clock does not.

### Which is updated more often, Chess.clock or CalculatorZ?

Chess.clock ships an update every 3 months, and CalculatorZ every 7 months. Most recently, Chess.clock was updated on October 15, 2026 and CalculatorZ on October 22, 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.*