Four Line Diary / 4行日記 vs One
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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!
One
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One-Line Diary is a simple journaling app that lets you easily capture your daily thoughts and moments in just a few words. With the calendar view, you can look back on past entries and quickly see how many posts you made on each day at a glance. The built-in report feature helps you review and visualize your records, making it easy to notice changes in your feelings and habits over time. Designed with a clean and distraction-free interface, the app lets you focus entirely on your thoughts without interruption. Why not start recording small daily insights and emotional changes at your own pace?
Screenshots
Verdict
The clearest difference is iOS requirement: Four Line Diary / 4行日記 at 11.0 against One's 13.0. On price, update cadence, ads and in-app purchases 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.
Four Line Diary / 4行日記 ships an update every 4 days, One every 3 days. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.
| Parameter | Four Line Diary / 4行日記 | One |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 days | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 11.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 31 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | arai.me | Yuga Matsumi |
In-app purchases
Four Line Diary / 4行日記
No in-app purchases
One
No in-app purchases









