# Chemicastle vs Kemistri

The clearest difference is in-app purchases: Chemicastle at none against Kemistri's 4. Chemicastle also leads on iOS requirement (15.0 vs 17.0). Kemistri's advantage is update cadence (every 5 weeks vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Kemistri sells 4 in-app purchases, starting at $3.99 per month. Chemicastle asks for nothing beyond the download.

Chemicastle ships an update every 4 months, Kemistri every 5 weeks. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Chemicastle | Kemistri |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/kemistri/id6757977295/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 301 MB | 45 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Haute ecole pedagogique HEP-BEJUNE](https://appshunter.io/developer/1835648343) | [EdBetter Limited](https://appshunter.io/developer/1810500957) |

## What reviewers say

### Chemicastle

[App page](https://appshunter.io/ios/app/chemicastle/id6753705536)

**Features:** macOS Compatibility

**In-app purchases:** none


### Kemistri

[App page](https://appshunter.io/ios/app/kemistri/id6757977295)

An interactive game designed to make learning chemistry engaging and accessible. It helps students build a strong foundation by exploring concepts, practicing problem-solving, and completing challenges. Offers daily learning opportunities and achievements for a rewarding educational experience.

**Highlights:** Interactive chemistry challenges, Explore periodic table and atomic structure, Build molecules and chemical structures, Practice balancing chemical equations, Daily learning challenges and achievements, VSEPR theory and molecular geometry, Acids, bases, and pH scale exploration

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Access Pass | $3.99 | per month |
| Quarterly Access Pass | $9.99 | per 3 months |
| Semiannual Access Pass | $17.99 | per 6 months |
| Annual Access Pass | $24.99 | per year |


## Frequently asked questions

### Is Chemicastle free?

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

### Is Kemistri free?

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

### Do Chemicastle or Kemistri have ads?

Neither Chemicastle nor Kemistri shows ads.

### Which is updated more often, Chemicastle or Kemistri?

Chemicastle ships an update every 4 months, and Kemistri every 5 weeks. Most recently, Chemicastle was updated on October 24, 2026 and Kemistri on October 28, 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.*