SoundMute vs Four Line Diary / 4行日記
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SoundMute
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.
- 10 natural masking sounds
- Toilet flush sound
- Water sounds
- Weather sounds
- Plays in silent mode
- Remembers last selected sound
- Prevents screen sleep
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A sound masking app for those who feel self-conscious about bathroom noises. Play a masking sound with a single tap. Choose from 10 natural sounds including toilet flush, bubbling streams, waterfalls, ocean ripples, heavy rain, and thunderstorms. Sounds are organized by category for quick selection. ■ Features ・10 masking sounds (Toilet, Water, Weather) ・Plays even in silent mode ・Remembers your last selected sound ・Prevents screen sleep during playback ・Simple, intuitive interface ・No ads
Four Line Diary / 4行日記
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あなたの日々の出来事を、とってもシンプルに簡単かつ効果的に記録できる4行日記アプリです。毎日の忙しさの中で、大切な瞬間や学びを見逃さないための完璧なツール。シンプルで直感的なデザインが、4行日記をつける習慣をサポートします。 主な特徴: ・カレンダービュー: 日付を選択して、その日の日記に簡単アクセス。 ・4行日記フォーマット: 事実、発見、教訓、宣言 - これらの4つの要素で、日々の体験を深く反映。 ・自動保存機能: 書いた内容は自動的に保存されるので、大切な思い出も安心。 ・シンプルで美しいデザイン: 直感的なインターフェースで、誰でも簡単に使用可能。 日々の小さな出来事から大切な教訓まで、何でも記録して、時間をかけて振り返ることができます。 今すぐダウンロードして、自分だけの日記を始めましょう!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | SoundMute | Four Line Diary / 4行日記 |
|---|---|---|
| Price | Free | Free |
| Rating | 1.7 (3 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 9 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | icot | arai.me |
In-app purchases
SoundMute
No in-app purchases
Four Line Diary / 4行日記
No in-app purchases









