# 化学マスター vs PIECE

化学マスター and PIECE are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. 化学マスター sells 1 one-off in-app purchase and PIECE sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

化学マスター ships an update every 5 days, PIECE every 3 days. The most recent releases landed on October 31, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | 化学マスター | PIECE |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 3 days** |
| Size | 37 MB | 12 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ryo otsuka](https://appshunter.io/developer/6788628020) | [Shuntaro Shimada](https://appshunter.io/developer/1851679432) |

## What reviewers say

### 化学マスター

[App page](https://appshunter.io/ios/app/id6788745347)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 化学マスター Pro | $2.99 | one-time |


### PIECE

[App page](https://appshunter.io/ios/app/piece/id6796343521)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| チケット5枚 | $1.99 | one-time |
| チケット10枚 | $1.99 | one-time |
| チケット50枚 はじめまして価格 | $5.99 | one-time |
| チケット50枚 | $9.99 | one-time |


## Frequently asked questions

### Is 化学マスター free?

化学マスター is free to download, with in-app purchases available.

### Is PIECE free?

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

### Do 化学マスター or PIECE have ads?

Neither 化学マスター nor PIECE shows ads.

### Which is updated more often, 化学マスター or PIECE?

化学マスター ships an update every 5 days, and PIECE every 3 days. Most recently, 化学マスター was updated on October 31, 2026 and PIECE on November 3, 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.*