# Onga9 vs 吸音材ナビ 残響・RT60測定

The clearest difference is in-app purchases: Onga9 at none against 吸音材ナビ 残響・RT60測定's 1. Onga9 also leads on update cadence (every 3 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 吸音材ナビ 残響・RT60測定 sells 1 one-off in-app purchase. Onga9 asks for nothing beyond the download.

Onga9 ships an update every 3 days, 吸音材ナビ 残響・RT60測定 monthly. The most recent releases landed on September 28, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Onga9 | 吸音材ナビ 残響・RT60測定 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Monthly |
| Size | 13 MB | 2 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kenta Terunuma](https://appshunter.io/developer/1883249034) | [Shuhei Yamamoto](https://appshunter.io/developer/1896725589) |

## What reviewers say

### Onga9

[App page](https://appshunter.io/ios/app/onga9/id6760211706)

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

**In-app purchases:** none


### 吸音材ナビ 残響・RT60測定

[App page](https://appshunter.io/ios/app/rt60/id6787505910)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro（買い切り） | $9.99 | one-time |


## Frequently asked questions

### Is Onga9 free?

Onga9 is free to download, with no in-app purchases.

### Is 吸音材ナビ 残響・RT60測定 free?

吸音材ナビ 残響・RT60測定 is free to download, with in-app purchases available.

### Do Onga9 or 吸音材ナビ 残響・RT60測定 have ads?

Neither Onga9 nor 吸音材ナビ 残響・RT60測定 shows ads.

### Which is updated more often, Onga9 or 吸音材ナビ 残響・RT60測定?

Onga9 ships an update every 3 days, and 吸音材ナビ 残響・RT60測定 monthly. Most recently, Onga9 was updated on September 28, 2026 and 吸音材ナビ 残響・RT60測定 on September 18, 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.*