# 音声案内番 vs Math Sphere

The clearest difference is in-app purchases: Math Sphere at none against 音声案内番's 1. Math Sphere also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 13 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 音声案内番 sells 1 one-off in-app purchase. Math Sphere asks for nothing beyond the download.

音声案内番 ships an update every 13 months, Math Sphere every 3 weeks. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | 音声案内番 | Math Sphere |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 13 months | **Every 3 weeks** |
| Size | 4 MB | 25 MB |
| Requires iOS | 13.4 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [KENICHI YAMAMOTO](https://appshunter.io/developer/1335325739) | [otsuki hayato](https://appshunter.io/developer/1828600192) |

## What reviewers say

### 音声案内番

[App page](https://appshunter.io/ios/app/id1519013675)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告非表示オプション | $1.99 | one-time |


### Math Sphere

[App page](https://appshunter.io/ios/app/math-sphere/id6749747366)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 音声案内番 free?

音声案内番 is free to download, with in-app purchases available.

### Is Math Sphere free?

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

### Do 音声案内番 or Math Sphere have ads?

音声案内番 shows ads; Math Sphere does not.

### Which is updated more often, 音声案内番 or Math Sphere?

音声案内番 ships an update every 13 months, and Math Sphere every 3 weeks. Most recently, 音声案内番 was updated on October 27, 2026 and Math Sphere on October 30, 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.*