# Decibel Meter vs Plain｜騒音を検知して環境音を自動再生

The clearest difference is in-app purchases: Plain｜騒音を検知して環境音を自動再生 at none against Decibel Meter's 3. Plain｜騒音を検知して環境音を自動再生 also leads on ads (none vs shown) and update cadence (weekly vs every 5 weeks). Decibel Meter's advantage is iOS requirement (15.0 vs 26.2). On price and device support there is nothing between them.

Both are free to download. Decibel Meter sells 3 in-app purchases, starting at $1.99 per 7 days. Plain｜騒音を検知して環境音を自動再生 asks for nothing beyond the download.

Decibel Meter ships an update every 5 weeks, Plain｜騒音を検知して環境音を自動再生 weekly. The most recent releases landed on October 31, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Decibel Meter | Plain｜騒音を検知して環境音を自動再生 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Weekly** |
| Size | 95 MB | 12 MB |
| Requires iOS | **15.0** | 26.2 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [励毅 陈](https://appshunter.io/developer/1879658258) | [KIICHI STUDIO](https://appshunter.io/developer/1855811809) |

## What reviewers say

### Decibel Meter

[App page](https://appshunter.io/ios/app/decibel-meter-noise-recorder/id6759807523)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly | $1.99 | per 7 days |
| Pro Monthly | $2.99 | per month |
| Pro Yearly | $19.99 | per year |


### Plain｜騒音を検知して環境音を自動再生

[App page](https://appshunter.io/ios/app/plain/id6761727598)

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

**In-app purchases:** none


## Frequently asked questions

### Is Decibel Meter free?

Decibel Meter is free to download, with in-app purchases available.

### Is Plain｜騒音を検知して環境音を自動再生 free?

Plain｜騒音を検知して環境音を自動再生 is free to download, with no in-app purchases.

### Do Decibel Meter or Plain｜騒音を検知して環境音を自動再生 have ads?

Decibel Meter shows ads; Plain｜騒音を検知して環境音を自動再生 does not.

### Which is updated more often, Decibel Meter or Plain｜騒音を検知して環境音を自動再生?

Decibel Meter ships an update every 5 weeks, and Plain｜騒音を検知して環境音を自動再生 weekly. Most recently, Decibel Meter was updated on October 31, 2026 and Plain｜騒音を検知して環境音を自動再生 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.*