nikki vs hagu.
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
hagu.
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hagu. は、授乳や育児の記録を できるだけ静かに続けられるように作ったアプリです。 量がわからなくても大丈夫。 記録できなかった日も、責めません。 深夜に開いても、まぶしくない。 ただ、今のあなたの隣にいられるように。 【主な機能】 ・左 / 右 / 両方を1タップで記録 ・ミルク / 搾乳 / おむつ記録 ・量の入力はすべて任意 ・深夜モード自動対応 ・静かなタイムライン ・週次レター「今週のあなたへ」
Screenshots
Verdict
The clearest difference is in-app purchases: hagu. at none against nikki's 2. hagu. also leads on ads (none vs shown) and update cadence (every 3 days vs every 2 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. hagu. asks for nothing beyond the download.
nikki ships an update every 2 months, hagu. every 3 days. The most recent releases landed on October 3, 2026 and October 17, 2026 respectively.
| Parameter | nikki | hagu. |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (5 ratings) — better | — |
| Positive reviews | 98.1% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 2 months | Every 3 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 30 MB | 64 MB |
| Age rating | 4+ | 4+ |
| Developer | REVOLAB Inc. | TATSUYA YASUMOTO |
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
hagu.
No in-app purchases
