# 化學之書 vs ExploreMath

The clearest difference is update cadence: ExploreMath at every 6 days against 化學之書's every 3 weeks. ExploreMath also leads on iOS requirement (15.0 vs 17.0). 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, ExploreMath every 6 days. The most recent releases landed on August 27, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | 化學之書 | ExploreMath |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Size | 55 MB | 4 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [BUDDHIST HO NAM KAM COLLEGE](https://appshunter.io/developer/1532349038) | [Kai Hin Tsoi](https://appshunter.io/developer/1618879551) |

## What reviewers say

### 化學之書

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

**Features:** Vision Pro support

**In-app purchases:** none


### ExploreMath

[App page](https://appshunter.io/ios/app/exploremath/id1620810052)

**Features:** macOS Compatibility

**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 ExploreMath free?

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

### Do 化學之書 or ExploreMath have ads?

Neither 化學之書 nor ExploreMath shows ads.

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

化學之書 ships an update every 3 weeks, and ExploreMath every 6 days. Most recently, 化學之書 was updated on August 27, 2026 and ExploreMath on June 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.*