OneDay日記 vs Shared Diary
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OneDay日記
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◆共有日記アプリの特徴 その名の通り、共有機能があります。 閲覧回数も見えるようになっています。 もちろん共有せず、読み専(ROM)でもOKです。 他の人の日記を参考にして自分の経験として吸収するのもOKです。 また、メールアドレスを登録すると、 共有時に表示される名前とアイコンを設定することができます。 広告も入れていません。完全にフリーです。安心してお使いください。 ※注意事項※ ①日記を共有する場合は、人物/場所が特定できるような誹謗中傷などはご遠慮ください。 ②現在バックアップ機能はありません。 →version1.4よりバックアップ機能を追加しました。
Shared Diary
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[Overview] This is a diary app that lets you share your days with people you care about. Here are some ways you can use it: * Jot down your thoughts and feelings as a personal diary * Share your daily life with close friends or your partner * Talk about your day with your child * Use it with your spouse to share little things—like gratitude, happy moments, or updates about the kids * Use it in a small team to keep track of daily work or share reports Once you get into the habit of writing a diary, you start noticing more things around you. It helps you become more aware of the little joys in everyday life, and it also strengthens your ability to express your thoughts in words. Being able to put your feelings and ideas into words boosts your communication skills, which can really help in your relationships—at school, work, or at home. If reading this made you think, "Maybe I’ll give diary writing a try," we’re happy to hear it. Even writing just 20 or 30 characters a day is totally fine. And honestly, you don’t even need to use this app—we just hope it encourages you to start. [Recommended for people who] * Want a simple, easy-to-use diary app * Want to build a daily writing habit * Feel shy about expressing feelings out loud * Want to do a shared/partner diary * Don’t want to exchange LINE but still want a casual way to communicate in text Term of service(EULA): https://originate-aster.co.jp/shared-diary/terms privacy policy: https://originate-aster.co.jp/privacy-policy/
Screenshots
Verdict
The clearest difference is in-app purchases: OneDay日記 at none against Shared Diary's 1. OneDay日記 also leads on ads (none vs shown) and device support (3 vs 1). Shared Diary's advantage is update cadence (fortnightly vs every 7 months). On price and iOS requirement 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. Shared Diary sells 1 in-app purchase, starting at $2.99 per month. OneDay日記 asks for nothing beyond the download.
OneDay日記 ships an update every 7 months, Shared Diary fortnightly. The most recent releases landed on September 19, 2026 and September 24, 2026 respectively.
| Parameter | OneDay日記 | Shared Diary |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 7 months | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 16.0 |
| Further details — not scored | ||
| Size | 42 MB | 41 MB |
| Age rating | 17+ | 4+ |
| Developer | Hiroki Sato | Originate Aster, Inc. |
In-app purchases
OneDay日記
No in-app purchases
Shared Diary
- Proプラン(1か月間)$2.991 Month









