# 化學之書 vs StoichioAI

The clearest difference is update cadence: StoichioAI at weekly against 化學之書's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

化學之書 ships an update every 3 weeks, StoichioAI weekly. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 化學之書 | StoichioAI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Size | 55 MB | 27 MB |
| Requires iOS | **17.0** | 17.1 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [BUDDHIST HO NAM KAM COLLEGE](https://appshunter.io/developer/1532349038) | [Pang Ka Wai](https://appshunter.io/developer/797633008) |

## What reviewers say

### 化學之書

[App page](https://appshunter.io/ios/app/id1512573867)

**Features:** Vision Pro support

**In-app purchases:** none


### StoichioAI

[App page](https://appshunter.io/ios/app/stoichioai/id6755667893)

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

**In-app purchases:** none


## Frequently asked questions

### Is 化學之書 free?

化學之書 is free to download, with no in-app purchases.

### Is StoichioAI free?

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

### Do 化學之書 or StoichioAI have ads?

Neither 化學之書 nor StoichioAI shows ads.

### Which is updated more often, 化學之書 or StoichioAI?

化學之書 ships an update every 3 weeks, and StoichioAI weekly. Most recently, 化學之書 was updated on October 27, 2026 and StoichioAI on October 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.*