# Chess Clock vs Blunder

The clearest difference is update cadence: Blunder at every 3 days against Chess Clock's fortnightly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Chess Clock sells 3 in-app purchases, starting at $1.99 per month and Blunder sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Chess Clock ships an update fortnightly, Blunder every 3 days. The most recent releases landed on November 9, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Chess Clock | Blunder |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 3 days** |
| Size | 18 MB | 21 MB |
| Requires iOS | 26.1 | **26.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Naveen Mathivanan](https://appshunter.io/developer/1870850926) | [Lucas Raggers](https://appshunter.io/developer/1775751230) |

## What reviewers say

### Chess Clock

[App page](https://appshunter.io/ios/app/chess-clock-dual-timer/id6797176383)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chess Clock Pro Monthly | $1.99 | per month |
| Chess Clock Pro Annual | $9.99 | per year |
| Chess Clock Pro Lifetime | $14.99 | one-time |


### Blunder

[App page](https://appshunter.io/ios/app/blunder-chess-scanner/id6810770465)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $4.99 | one-time |


## Frequently asked questions

### Is Chess Clock free?

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

### Is Blunder free?

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

### Do Chess Clock or Blunder have ads?

Neither Chess Clock nor Blunder shows ads.

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

Chess Clock ships an update fortnightly, and Blunder every 3 days. Most recently, Chess Clock was updated on November 9, 2026 and Blunder on November 10, 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.*