# BiDoku vs Hidden Chess

The clearest difference is ads: BiDoku at none against Hidden Chess's shown. BiDoku also leads on update cadence (every 2 days vs monthly). Hidden Chess's advantage is iOS requirement (13.0 vs 26.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. BiDoku sells 1 one-off in-app purchase and Hidden Chess sells 7 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

BiDoku ships an update every 2 days, Hidden Chess monthly. The most recent releases landed on October 12, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | BiDoku | Hidden Chess |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/bidoku/id6759069902/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 days** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 32 MB | 207 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | +17 |
| Developer | [Job Sierkstra](https://appshunter.io/developer/1674438160) | [Apollo Software Pte Ltd](https://appshunter.io/developer/1171694801) |

## What reviewers say

### BiDoku

[App page](https://appshunter.io/ios/app/bidoku/id6759069902)

This logic puzzle game challenges you to fill a grid with 0s and 1s. Convert binary numbers to decimal and match row/column targets using pure logic. It offers a fresh twist on number puzzles for those who enjoy brain teasers.

**Highlights:** Binary number puzzles, Grid deduction gameplay, Multiple difficulty levels, Helper modes, Smart hint system, Best time tracking, Hard mode with grouped targets

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BiDoku Premium | $1.99 | one-time |


### Hidden Chess

[App page](https://appshunter.io/ios/app/hidden-chess-shadow-chess/id6780352762)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coin1 | $1.99 | one-time |
| Coin2 | $2.99 | one-time |
| Coin3 | $4.99 | one-time |
| Coin4 | $7.99 | one-time |
| Coin5 | $11.99 | one-time |
| Coin6 | $19.99 | one-time |
| Coin7 | $29.99 | one-time |


## Frequently asked questions

### Is BiDoku free?

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

### Is Hidden Chess free?

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

### Do BiDoku or Hidden Chess have ads?

Hidden Chess shows ads; BiDoku does not.

### Which is updated more often, BiDoku or Hidden Chess?

BiDoku ships an update every 2 days, and Hidden Chess monthly. Most recently, BiDoku was updated on October 12, 2026 and Hidden Chess on October 5, 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.*