nikki vs おとなの日記帳
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)
Read full descriptionHide full description
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
おとなの日記帳
A simple and stylish diary app that allows you to attach unlimited photos. Easily write long entries with a convenient keyboard and attach multiple photos at once. Secure your memories with a passcode lock.
- Unlimited photo attachments
- Batch photo selection
- Camera integration
- Long text entry support
- Multiple entries per day
- Passcode lock
Read full descriptionHide full description
◉このアプリについて おとなの日記帳は写真も貼れるシンプルで軽量な日記アプリです。 数ある日記アプリの中でも一番使いやすくおしゃれなアプリかもしれません。 ◉こだわり - 写真の添付枚数は無制限 - 写真は一括選択して添付できる - カメラ撮影して添付できる - 便利なキーボードのおかげで長文もスラスラ書ける - 1日あたり何個でも日記を書ける - パスコードロック機能あり
Screenshots
Verdict
The clearest difference is rating: nikki at 5.0 against おとなの日記帳's 4.6. nikki also leads on review sentiment (98% vs 85%) and iOS requirement (15.6 vs 17). おとなの日記帳's advantage is update cadence (monthly vs every 2 months) and ratings volume (21 vs 5). On price, ads, in-app purchases and monetization model 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 and おとなの日記帳 sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
nikki holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 5 and 21 respectively. Written reviews point the same way: 98% of nikki's written reviews are positive against 85% of おとなの日記帳's.
nikki ships an update every 2 months, おとなの日記帳 monthly. The most recent releases landed on June 9, 2026 and September 19, 2026 respectively.
| Parameter | nikki | おとなの日記帳 |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (5 ratings) — better | 4.6 (21 ratings) |
| Positive reviews | 98.1% of reviews — better | 85.0% of reviews |
| Number of ratings | 5 | 21 — better |
| Update frequency | Every 2 months | Monthly — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 17 |
| Further details — not scored | ||
| Size | 30 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | REVOLAB Inc. | Masaki Hirano |
Customer experience
nikki
おとなの日記帳
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
おとなの日記帳
- 広告非表示機能$2.99
- バックアップ復元機能の開放$2.99
