nikki vs Secret Diary
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
Secret Diary
Securely record your thoughts, daily events, and journeys with this private diary app. It offers robust security features like Face ID, Touch ID, or passcode lock, and allows for extensive personalization with themes, fonts, and backgrounds. All entries are stored locally for maximum privacy.
- Face ID, Touch ID, passcode lock
- iCloud backup and restore
- Unlimited editing options
- Add photos, backgrounds, fonts
- Personalize with artistic themes
- Local data storage
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Secret Diary is a free diary journal app with high security. Your data is safe with iCloud backup and restore. This app use Face ID, Touch ID, or passcode lock to protect the security of your secret thoughts, daily diary and journeys. To ensure privacy and security, all your entry will only be saved on your device and not sent to any servers. Secret Diary provide unlimited dairy editing options, adding photos, backgrounds, fonts, moods, etc. Also, you can personalize this app with multiple artistic and kawaii themes. Everything is free! This App will protect your memories securely. Please try and enjoy it!
Screenshots
Verdict
The clearest difference is in-app purchases: Secret Diary at none against nikki's 2. Secret Diary also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 2 months). nikki's advantage is rating (5.0 vs 4.7) and review sentiment (98% vs 85%). 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. Secret Diary asks for nothing beyond the download.
nikki holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Secret Diary has 98 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 98% of nikki's written reviews are positive against 85% of Secret Diary's.
nikki ships an update every 2 months, Secret Diary every 2 weeks. The most recent releases landed on October 3, 2026 and October 23, 2026 respectively.
| Parameter | nikki | Secret Diary |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (5 ratings) — better | 4.7 (98 ratings) |
| Positive reviews | 98.1% of reviews — better | 85.0% of reviews |
| Number of ratings | 5 | 98 — better |
| Update frequency | Every 2 months | Every 2 weeks — better |
| 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 | 14.0 — better |
| Further details — not scored | ||
| Size | 30 MB | 66 MB |
| Age rating | 4+ | 4+ |
| Developer | REVOLAB Inc. | Trang Le Thi |
Customer experience
nikki
Secret Diary
Bugs and requests
nikki
Not enough reviews yet to summarise bugs or requests.
Secret Diary
Reported bugs
5 issues- Cannot get back to previous background themes
- Lock screen appears after entries are visible
- App crashes when phone is on airplane mode
- Difficulty entering or recovering passcode
- Passcode not visible or functional at times
Requested features
5 requests- Allow autocorrect while typing
- Ensure lock screen appears first
- Recover passcode when forgotten
- Add backup feature
- Enable Face ID/Touch ID for login
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
Secret Diary
No in-app purchases
