# Chemtrix vs Idle.py

The clearest difference is iOS requirement: Chemtrix at 13.0 against Idle.py's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Chemtrix sells 1 one-off in-app purchase and Idle.py sells 8 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 7, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Chemtrix | Idle.py |
| --- | --- | --- |
| 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 | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | Free with in-app purchases | — |
| Size | 23 MB | 39 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sam Woolf](https://appshunter.io/developer/1439593063) | [Byte Insights Limited](https://appshunter.io/developer/1895839252) |

## 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.)


### Idle.py

[App page](https://appshunter.io/ios/app/idlepy-python-tutorial-game/id6764583534)

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mentor Pack | Free | one-time |
| +5 Insight | $0.99 | one-time |
| Skip 4 Hours | $0.99 | one-time |
| Skip 24 Hours | $1.99 | one-time |
| +15 Insight | $2.99 | one-time |
| Founder Pack | $3.99 | one-time |
| Skip 7 Days | $3.99 | one-time |
| Sandbox Mode | $19.99 | one-time |


## Frequently asked questions

### Is Chemtrix free?

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

### Is Idle.py free?

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

### Do Chemtrix or Idle.py have ads?

Neither Chemtrix nor Idle.py shows ads.

### Which is updated more often, Chemtrix or Idle.py?

Chemtrix ships an update weekly, and Idle.py weekly. Most recently, Chemtrix was updated on October 7, 2026 and Idle.py on September 25, 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.*