# シラス vs Math Key

The clearest difference is price: シラス at Free against Math Key's $1.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

シラス is free to download; Math Key costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 8, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | シラス | Math Key |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/id6450448654/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 45.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Size | 49 MB | 1 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Shirasu LLC](https://appshunter.io/developer/1693341807) | [1STGROUP PRIVATE LIMITED](https://appshunter.io/developer/6773183984) |

## What reviewers say

### シラス

[App page](https://appshunter.io/ios/app/id6450448654)

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

**In-app purchases:** none


### Math Key

[App page](https://appshunter.io/ios/app/math-key/id6790252476)

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

**In-app purchases:** none


## Frequently asked questions

### Is シラス free?

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

### Is Math Key free?

Math Key costs $1.99, with no in-app purchases.

### Do シラス or Math Key have ads?

Neither シラス nor Math Key shows ads.

### Which is updated more often, シラス or Math Key?

シラス ships an update every 3 weeks, and Math Key every 3 weeks. Most recently, シラス was updated on October 8, 2026 and Math Key on October 6, 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.*