# 数学図鑑 vs s＊タイム

The clearest difference is in-app purchases: s＊タイム at none against 数学図鑑's 2. s＊タイム also leads on ads (none vs shown) and update cadence (daily vs every 2 weeks). 数学図鑑's advantage is iOS requirement (17.0 vs 26.5). On price and device support there is nothing between them.

Both are free to download. 数学図鑑 sells 2 one-off in-app purchases. s＊タイム asks for nothing beyond the download.

数学図鑑 ships an update every 2 weeks, s＊タイム daily. The most recent releases landed on June 4, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | 数学図鑑 | s＊タイム |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 149 MB | 1 MB |
| Requires iOS | **17.0** | 26.5 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Keisuke Minami](https://appshunter.io/developer/1719444621) | [Seigo Mizouchi](https://appshunter.io/developer/1880010064) |

## What reviewers say

### 数学図鑑

[App page](https://appshunter.io/ios/app/id6499109813)

This app uses animations and dynamic visuals to explain complex high school math concepts. It aims to make abstract ideas intuitive and engaging for students and educators alike. Explore calculus, geometry, and equations through visual learning.

**Highlights:** Animated explanations of math concepts, Dynamic visual representations, Covers calculus, geometry, and equations, Intuitive understanding of abstract ideas, Aids students and educators

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告の削除 | $1.99 | one-time |
| 広告の削除+開発者への支援 | $2.99 | one-time |


### s＊タイム

[App page](https://appshunter.io/ios/app/s/id6786271135)

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

**In-app purchases:** none


## Frequently asked questions

### Is 数学図鑑 free?

数学図鑑 is free to download, with in-app purchases available.

### Is s＊タイム free?

s＊タイム is free to download, with no in-app purchases.

### Do 数学図鑑 or s＊タイム have ads?

数学図鑑 shows ads; s＊タイム does not.

### Which is updated more often, 数学図鑑 or s＊タイム?

数学図鑑 ships an update every 2 weeks, and s＊タイム daily. Most recently, 数学図鑑 was updated on June 4, 2026 and s＊タイム on September 18, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*