# nota. ー 音楽理論クイズ vs 深海探索図鑑

The clearest difference is update cadence: nota. ー 音楽理論クイズ at every 5 days against 深海探索図鑑's every 2 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

nota. ー 音楽理論クイズ ships an update every 5 days, 深海探索図鑑 every 2 weeks. The most recent releases landed on October 31, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | nota. ー 音楽理論クイズ | 深海探索図鑑 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 2 weeks |
| Size | 2 MB | 67 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KOHEI YAMASHITA](https://appshunter.io/developer/1876841861) | [Hironobu Aoki](https://appshunter.io/developer/1888522968) |

## What reviewers say

### nota. ー 音楽理論クイズ

[App page](https://appshunter.io/ios/app/nota/id6760968656)

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

**In-app purchases:** none


### 深海探索図鑑

[App page](https://appshunter.io/ios/app/id6761268477)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is nota. ー 音楽理論クイズ free?

nota. ー 音楽理論クイズ is free to download, with no in-app purchases.

### Is 深海探索図鑑 free?

深海探索図鑑 is free to download, with no in-app purchases.

### Do nota. ー 音楽理論クイズ or 深海探索図鑑 have ads?

Neither nota. ー 音楽理論クイズ nor 深海探索図鑑 shows ads.

### Which is updated more often, nota. ー 音楽理論クイズ or 深海探索図鑑?

nota. ー 音楽理論クイズ ships an update every 5 days, and 深海探索図鑑 every 2 weeks. Most recently, nota. ー 音楽理論クイズ was updated on October 31, 2026 and 深海探索図鑑 on November 9, 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.*