# Busy Binary vs Chempuz

The clearest difference is in-app purchases: Busy Binary at none against Chempuz's 2. Busy Binary also leads on iOS requirement (9.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Chempuz sells 2 one-off in-app purchases. Busy Binary asks for nothing beyond the download.

Busy Binary ships an update every 6 weeks, Chempuz every 5 weeks. The most recent releases landed on October 6, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Busy Binary | Chempuz |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/busy-binary/id1273591168/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 6 weeks | **Every 5 weeks** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 180 MB | 57 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [teruhisa nagato](https://appshunter.io/developer/1034153997) | [TomatoAppLab](https://appshunter.io/developer/1676711750) |

## What reviewers say

### Busy Binary

[App page](https://appshunter.io/ios/app/busy-binary/id1273591168)

Test your brain with a number conversion game. Convert binary to decimal in timed challenges or practice modes. Compete with others for high scores.

**Highlights:** Binary to Decimal Conversion, Training Mode, Challenge Mode, Difficulty Levels (Easy, Normal, Hard), Combo System, Global Ranking System

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

**In-app purchases:** none


### Chempuz

[App page](https://appshunter.io/ios/app/chempuz/id6446211267)

Learn organic chemistry basics by creating molecules and completing puzzles. Trace functional groups to build compounds, score higher with complex structures, and use flashcards to memorize names. Enjoy learning through engaging gameplay.

**Highlights:** Create organic molecules by tracing functional groups, Build approximately 100 types of organic molecules, Score higher with more complex compound creation, Collect discovered compounds, Memorize molecule names with flashcards, Learn organic chemistry through gameplay

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 gem | $0.29 | one-time |
| 10 gems | $1.99 | one-time |


## Frequently asked questions

### Is Busy Binary free?

Busy Binary is free to download, with no in-app purchases.

### Is Chempuz free?

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

### Do Busy Binary or Chempuz have ads?

Both Busy Binary and Chempuz show ads.

### Which is updated more often, Busy Binary or Chempuz?

Busy Binary ships an update every 6 weeks, and Chempuz every 5 weeks. Most recently, Busy Binary was updated on October 6, 2026 and Chempuz on October 9, 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.*