# 100ます計算ノート vs Think Why

The clearest difference is ads: Think Why at none against 100ます計算ノート's shown. 100ます計算ノート's advantage is update cadence (every 6 days vs fortnightly). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. 100ます計算ノート sells 1 one-off in-app purchase and Think Why sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

100ます計算ノート ships an update every 6 days, Think Why fortnightly. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 100ます計算ノート | Think Why |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/think-why/id6799816213/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 6 days** | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 37 MB | 62 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yuki Taniguchi](https://appshunter.io/developer/1879248125) | [放 徐](https://appshunter.io/developer/6793334686) |

## What reviewers say

### 100ます計算ノート

[App page](https://appshunter.io/ios/app/100/id6761297945)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告を削除する | $2.99 | one-time |


### Think Why

[App page](https://appshunter.io/ios/app/think-why/id6799816213)

This app teaches elementary students how to understand math word problems by breaking down the reasoning process into manageable steps. It focuses on conceptual understanding rather than just keyword matching. Users can access free content or unlock the full learning path with a one-time purchase.

**Highlights:** Step-by-step reasoning for word problems, Interactive models for visualization, Explanation of intermediate numbers, Answer checking against the story, Transferring reasoning to new contexts, Full learning path unlock

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Learning Path | $19.99 | one-time |


## Frequently asked questions

### Is 100ます計算ノート free?

100ます計算ノート is free to download, with in-app purchases available.

### Is Think Why free?

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

### Do 100ます計算ノート or Think Why have ads?

100ます計算ノート shows ads; Think Why does not.

### Which is updated more often, 100ます計算ノート or Think Why?

100ます計算ノート ships an update every 6 days, and Think Why fortnightly. Most recently, 100ます計算ノート was updated on November 5, 2026 and Think Why on October 31, 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.*