# 20s Timer vs Modern Chess Clock

The clearest difference is in-app purchases: Modern Chess Clock at none against 20s Timer's 1. Modern Chess Clock also leads on ads (none vs shown) and update cadence (every 10 days vs every 37 months). 20s Timer's advantage is iOS requirement (13.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. 20s Timer sells 1 one-off in-app purchase. Modern Chess Clock asks for nothing beyond the download.

20s Timer ships an update every 37 months, Modern Chess Clock every 10 days. The most recent releases landed on October 11, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | 20s Timer | Modern Chess Clock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 37 months | **Every 10 days** |
| Size | 6 MB | 5 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [MARK MANSER](https://appshunter.io/developer/1378563905) | [Nurullah Bilgin](https://appshunter.io/developer/1638320664) |

## What reviewers say

### 20s Timer

[App page](https://appshunter.io/ios/app/20s-timer/id1521305784)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


### Modern Chess Clock

[App page](https://appshunter.io/ios/app/modern-chess-clock/id1638320662)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 20s Timer free?

20s Timer is free to download, with in-app purchases available.

### Is Modern Chess Clock free?

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

### Do 20s Timer or Modern Chess Clock have ads?

20s Timer shows ads; Modern Chess Clock does not.

### Which is updated more often, 20s Timer or Modern Chess Clock?

20s Timer ships an update every 37 months, and Modern Chess Clock every 10 days. Most recently, 20s Timer was updated on October 11, 2026 and Modern Chess Clock on October 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*