# 高校数学 数I〜数C 解法の最初の一手 vs PIECE

The clearest difference is in-app purchases: PIECE at none against 高校数学 数I〜数C 解法の最初の一手's 1. PIECE also leads on update cadence (every 3 days vs every 8 days). 高校数学 数I〜数C 解法の最初の一手's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price and ads there is nothing between them.

Both are free to download. 高校数学 数I〜数C 解法の最初の一手 sells 1 one-off in-app purchase. PIECE asks for nothing beyond the download.

高校数学 数I〜数C 解法の最初の一手 ships an update every 8 days, PIECE every 3 days. Both last shipped on September 29, 2026.

## The numbers

| Metric | 高校数学 数I〜数C 解法の最初の一手 | PIECE |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 3 days** |
| Size | 22 MB | 12 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Gen Nakanishi](https://appshunter.io/developer/6782112814) | [Shuntaro Shimada](https://appshunter.io/developer/1851679432) |

## What reviewers say

### 高校数学 数I〜数C 解法の最初の一手

[App page](https://appshunter.io/ios/app/ic/id6782112812)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 全解放（すべての初手） | $4.99 | one-time |


### PIECE

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

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

**In-app purchases:** none


## Frequently asked questions

### Is 高校数学 数I〜数C 解法の最初の一手 free?

高校数学 数I〜数C 解法の最初の一手 is free to download, with in-app purchases available.

### Is PIECE free?

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

### Do 高校数学 数I〜数C 解法の最初の一手 or PIECE have ads?

Neither 高校数学 数I〜数C 解法の最初の一手 nor PIECE shows ads.

### Which is updated more often, 高校数学 数I〜数C 解法の最初の一手 or PIECE?

高校数学 数I〜数C 解法の最初の一手 ships an update every 8 days, and PIECE every 3 days. Most recently, 高校数学 数I〜数C 解法の最初の一手 was updated on September 29, 2026 and PIECE on September 29, 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.*