# Chemtrix vs RhythmTap

The clearest difference is in-app purchases: RhythmTap at none against Chemtrix's 1. RhythmTap also leads on update cadence (daily vs weekly). Chemtrix's advantage is iOS requirement (13.0 vs 15). On price, ads and device support there is nothing between them.

Both are free to download. Chemtrix sells 1 one-off in-app purchase. RhythmTap asks for nothing beyond the download.

Chemtrix ships an update weekly, RhythmTap daily. The most recent releases landed on October 7, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Chemtrix | RhythmTap |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (95 ratings)](https://appshunter.io/ios/app/chemtrix/id1439593064/reviews)** | — |
| Number of ratings | **95** | — |
| Positive reviews | 52.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 23 MB | 10 MB |
| Requires iOS | **13.0** | 15 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sam Woolf](https://appshunter.io/developer/1439593063) | [莎莎 俞](https://appshunter.io/developer/1848120385) |

## What reviewers say

### Chemtrix

[App page](https://appshunter.io/ios/app/chemtrix/id1439593064)

A puzzle game where you build molecules by bonding atoms. Progress through levels, discover atomic secrets, and explore molecular structures. Features a free fall mode for continuous molecule building.

**Highlights:** Build molecules by bonding atoms, 24 challenging levels, Free fall mode for continuous play, Learn atomic bonding and molecular structures, Features Lewis-dot notation, Accurate energy calculations

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Chemtrix | $0.99 | one-time |

**What reviewers like**

- 💡 Great concept for learning chemistry
- 🤩 Engaging and fun gameplay
- 👍 Helpful for students
- ✨ Creative app design
- 🧠 Makes chemistry accessible

**What reviewers complain about**

- 💸 Paywall after few levels
- 🐛 Glitchy gameplay and controls
- 🤔 Confusing game mechanics
- 📚 Limited educational content
- ⏳ Slow progression with free version

**Reported bugs**

- Cannot progress past level 8/9
- In-app purchase prompt missing
- Game crashes
- Levels do not unlock after purchase
- Atom spawner glitches

**Requested features**

- Add more elements and compounds
- Include a sandbox mode
- Add a time limit option for levels
- Option to choose between naming structures or vice versa
- Translate to more languages (Spanish, Polish, Vietnamese, etc.)


### RhythmTap

[App page](https://appshunter.io/ios/app/rhythmtap/id6758607984)

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

**In-app purchases:** none


## Frequently asked questions

### Is Chemtrix free?

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

### Is RhythmTap free?

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

### Do Chemtrix or RhythmTap have ads?

Neither Chemtrix nor RhythmTap shows ads.

### Which is updated more often, Chemtrix or RhythmTap?

Chemtrix ships an update weekly, and RhythmTap daily. Most recently, Chemtrix was updated on October 7, 2026 and RhythmTap 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.*