# SoundMute vs Four Line Diary / ４行日記

The clearest difference is update cadence: Four Line Diary / ４行日記 at every 4 days against SoundMute's every 9 months. Four Line Diary / ４行日記 also leads on iOS requirement (11.0 vs 17.0). 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.

SoundMute ships an update every 9 months, Four Line Diary / ４行日記 every 4 days. The most recent releases landed on October 31, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | SoundMute | Four Line Diary / ４行日記 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.7 (3 ratings)](https://appshunter.io/ios/app/soundmute/id319911305/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 4 days** |
| Monetization | Free | — |
| Size | 8 MB | 31 MB |
| Requires iOS | 17.0 | **11.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [icot](https://appshunter.io/developer/315124358) | [arai.me](https://appshunter.io/developer/1652629805) |

## What reviewers say

### SoundMute

[App page](https://appshunter.io/ios/app/soundmute/id319911305)

This app provides a variety of natural sounds to mask bathroom noises, helping users feel more comfortable. It offers 10 distinct sound options, including toilet flushes and weather effects, with a simple interface for quick playback.

**Highlights:** 10 natural masking sounds, Toilet flush sound, Water sounds, Weather sounds, Plays in silent mode, Remembers last selected sound, Prevents screen sleep

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

**In-app purchases:** none


### Four Line Diary / ４行日記

[App page](https://appshunter.io/ios/app/four-line-diary/id6474243387)

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

**In-app purchases:** none


## Frequently asked questions

### Is SoundMute free?

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

### Is Four Line Diary / ４行日記 free?

Four Line Diary / ４行日記 is free to download, with no in-app purchases.

### Do SoundMute or Four Line Diary / ４行日記 have ads?

Neither SoundMute nor Four Line Diary / ４行日記 shows ads.

### Which is updated more often, SoundMute or Four Line Diary / ４行日記?

SoundMute ships an update every 9 months, and Four Line Diary / ４行日記 every 4 days. Most recently, SoundMute was updated on October 31, 2026 and Four Line Diary / ４行日記 on November 8, 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.*