# RiKeyboard vs 数学図鑑

The clearest difference is in-app purchases: RiKeyboard at none against 数学図鑑's 2. RiKeyboard also leads on ads (none vs shown) and iOS requirement (8.0 vs 17.0). 数学図鑑's advantage is review sentiment (100% vs 82%). On price, update cadence and device support there is nothing between them.

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

RiKeyboard ships an update every 3 weeks, 数学図鑑 every 2 weeks. The most recent releases landed on June 10, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | RiKeyboard | 数学図鑑 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (3 ratings)](https://appshunter.io/ios/app/rikeyboard/id1386036240/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 82.4% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 17 MB | 149 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [nakamura yusaku](https://appshunter.io/developer/1662214416) | [Keisuke Minami](https://appshunter.io/developer/1719444621) |

## What reviewers say

### RiKeyboard

[App page](https://appshunter.io/ios/app/rikeyboard/id1386036240)

This app provides an enhanced keyboard experience with a wide range of characters beyond standard alphabets and numbers. It includes various symbols and special mathematical characters, all accessible without requiring full keyboard access.

**Highlights:** Alphabet input, Number input (123, ¹²³, ₁₂₃), Standard symbols, Special characters (integral, sigma), No full access required

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is RiKeyboard free?

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

### Is 数学図鑑 free?

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

### Do RiKeyboard or 数学図鑑 have ads?

数学図鑑 shows ads; RiKeyboard does not.

### Which is updated more often, RiKeyboard or 数学図鑑?

RiKeyboard ships an update every 3 weeks, and 数学図鑑 every 2 weeks. Most recently, RiKeyboard was updated on June 10, 2026 and 数学図鑑 on June 4, 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.*