# ZugZwang vs CHESS/BLOCK

ZugZwang and CHESS/BLOCK are too close to call on the numbers: across 3 compared parameters — price, in-app purchases and iOS requirement among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. ZugZwang sells 4 in-app purchases, starting at $7.99 per month and CHESS/BLOCK sells 3 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | ZugZwang | CHESS/BLOCK |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | — |
| Update frequency | Weekly | — |
| Monetization | Freemium | — |
| Size | 49 MB | 10 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone** | — |
| Age rating | 4+ | 4+ |
| Developer | [DaDaMa Ug (haftungsbeschränkt)](https://appshunter.io/developer/1852993941) | [Ankur Gupta LLC](https://appshunter.io/developer/6779024951) |

## What reviewers say

### ZugZwang

[App page](https://appshunter.io/ios/app/zugzwang-chess-screen-time/id6808323304)

This app blocks distracting applications and websites, requiring users to solve a chess puzzle to gain temporary access. It offers a personalized rating system and strict mode for enhanced focus. Your progress is saved to your account and syncs across devices.

**Highlights:** Block apps, categories, and websites, Solve chess puzzles for access, Personalized Elo puzzle rating, Strict mode for enhanced focus, Cross-device progress syncing, No ads

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $7.99 | per month |
| Yearly | $14.99 | per year |
| Yearly | $19.99 | per year |
| Yearly | $29.99 | per year |


### CHESS/BLOCK

[App page](https://appshunter.io/ios/app/chessblock-screen-time/id6811248457)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CHESS/BLOCK Weekly | $4.99 | per 7 days |
| CHESS/BLOCK Annual | $29.99 | per year |
| Annual Launch Offer | $29.99 | per year |


## Frequently asked questions

### Is ZugZwang free?

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

### Is CHESS/BLOCK free?

CHESS/BLOCK is free to download, with in-app purchases available.

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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.*