# Chess Clock vs OTB Clock

The clearest difference is in-app purchases: Chess Clock at none against OTB Clock's 1. Chess Clock also leads on update cadence (every 5 days vs every 2 weeks) and iOS requirement (15.1 vs 17.0). OTB Clock's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. OTB Clock sells 1 in-app purchase, starting at $19.99 per year. Chess Clock asks for nothing beyond the download.

Chess Clock ships an update every 5 days, OTB Clock every 2 weeks. The most recent releases landed on September 15, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Chess Clock | OTB Clock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 5 days** | Every 2 weeks |
| Size | 72 MB | 1 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dawid Wrzesinski](https://appshunter.io/developer/1812701337) | [杰 向](https://appshunter.io/developer/1860305678) |

## What reviewers say

### Chess Clock

[App page](https://appshunter.io/ios/app/chess-clock-game-timer/id6757802516)

**Features:** macOS Compatibility

**In-app purchases:** none


### OTB Clock

[App page](https://appshunter.io/ios/app/otb-clock/id6762344990)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium — Yearly | $19.99 | per year |


## Frequently asked questions

### Is Chess Clock free?

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

### Is OTB Clock free?

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

### Do Chess Clock or OTB Clock have ads?

Chess Clock shows ads; OTB Clock does not.

### Which is updated more often, Chess Clock or OTB Clock?

Chess Clock ships an update every 5 days, and OTB Clock every 2 weeks. Most recently, Chess Clock was updated on September 15, 2026 and OTB Clock on September 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.*