nikki vs OneDay日記
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
nikki
This app allows you to keep a private diary with rich media. You can add photos, take notes in a chat format, and use it as a planner. Security features include password and biometric locks, with customizable themes to personalize your journaling experience.
- Insert pictures into diary entries
- Chat-style memo function
- Use as a future date schedule book
- Password and biometric app lock
- Various fun stamps
- Customizable timeline themes (Pinboard, List, Calendar)
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Wanna write your secret diary...?? Here is the perfect app for you!! ◎Functions 1. Pictures can be inserted into each article. 2. There is a memo function: You can take notes in a chat format. 3. It can be used as a schedule book by writing on a future date. 4. You can lock the app with a password. It corresponds also to Face ID, Touch ID. 5. There are various fun stamps. ◎Change the timeline theme as you like (3 types) 1. Pinboard type with an emphasis on photos 2. List type with an emphasis on articles 3. Calendar type with an emphasis on practicality
OneDay日記
This app allows users to create and share personal diaries with others. You can choose to keep your entries private or make them visible to a community, with view counts displayed. It offers customization for your profile and is completely free to use without ads.
- Shared diary functionality
- View counts for entries
- Private journaling option
- Profile customization (name, icon)
- Backup feature available
- Completely free to use
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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。
Screenshots
Verdict
The clearest difference is in-app purchases: OneDay日記 at none against nikki's 2. OneDay日記 also leads on ads (none vs shown). nikki's advantage is review sentiment (98% vs 67%) and update cadence (every 2 months vs every 7 months). On price, device support 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. nikki sells 2 one-off in-app purchases. OneDay日記 asks for nothing beyond the download.
nikki ships an update every 2 months, OneDay日記 every 7 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | nikki | OneDay日記 |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (5 ratings) — better | — |
| Positive reviews | 98.1% of reviews — better | 66.7% of reviews |
| Number of ratings | 5 — better | — |
| Update frequency | Every 2 months — better | Every 7 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 30 MB | 42 MB |
| Age rating | 4+ | 17+ |
| Developer | REVOLAB Inc. | Hiroki Sato |
Customer experience
nikki
OneDay日記
In-app purchases
nikki
- 添付画像を10枚にUP$2.99
- 広告非表示（広告を外す）$7.99
OneDay日記
No in-app purchases
