nikki vs Diary with lock
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
Diary with lock
Create a secure personal journal to record daily events, thoughts, and secrets. Protect your entries with a password or PIN code and customize the look with different colors and fonts. This app offers a simple, fast, and user-friendly way to document your life.
- Password & PIN code protection
- Customizable background colors
- Changeable font styles
- Easy-to-use interface
- Searchable entries
- Unlimited entries
- Multi-language support
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Use "Diary with lock" app to make your own personal journal of daily events, appointments, secrets and feelings. ****************FEATURES**************** • Diary with lock: Password & pin code protection • Diary with lock: Personalize background color (Pink, Purple, Blue, ++) • Diary with lock: Change font-style • Diary with lock: Easy to use • Diary with lock: Search entries • Diary with lock: Make unlimited entries • Diary with lock: Support 3 languages: English, Japanese, Vietnamese. • Diary with lock: The most downloaded diary app on AppStore! ******************************************* Build from the ground up to be simple and user friendly, the user interface is designed to allow you to enter new notes quickly and easily. With this Diary you can write all your private notes and secure them with a pin code or password. * Track and write about your daily activities Make it a habit to quickly write one or more mini-notes during your day. Simply leave a few words about your workout session, what happened at school or in the office during your day. In weekends, you can write about all the fun you had walking your dog, meeting with friends, or being social with your family. Make it a unique travel diary, or road journal that documents your journey. This can be the daily activity log you always have wanted. Make it your personal journal and have fun reading it over in few year, and share a few laughs with your friends. As this app is pure textual, and contains no images or photos, it runs ultra fast and smooth on any iOS device, and consumes minimal of available memory and disk-space! * This diary is perfect to use as: 1. Diet journal A food diary is a daily record of all food consumed as a means of tracking calorie consumption, weight loss or other nutritional monitoring. 2. Dream journal Or dream diary is a journal in which dream experiences are recorded for later analysis and possibly oneiromancy. 3. Sleep diaries A sleep log is a tool used in diagnosis of sleep disorders. 4. Travel journals A travel diary, or road journal, is valuable documentation of a journey. (only textual, no images or photos) 5. Write your own Autobiography This diary app can easily fit the purpose of a writing down your memoir or chronicle. Keep a log or logbook to record history. Do like famous Anne Frank, make daily records, document life in your own daybook. Never forget a journal entry again, setup a reminder to alert you when it is time to write. Protect all personal notes by adding a pin code when it starts up. Never worry about losing memories again. Easily send a backup of diary entries directly to email for extra protection. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://privacy-policy-site-five-nu.vercel.app
Screenshots
Verdict
The clearest difference is rating: nikki at 5.0 against Diary with lock's 4.3. nikki also leads on review sentiment (98% vs 66%). Diary with lock's advantage is ads (none vs shown) and ratings volume (1.2K vs 5). On price, update cadence, 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 Diary with lock sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.
nikki holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Diary with lock has 1.2K 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 66% of Diary with lock's.
nikki ships an update every 2 months, Diary with lock every 6 weeks. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | nikki | Diary with lock |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (5 ratings) — better | 4.3 (1.2K ratings) |
| Positive reviews | 98.1% of reviews — better | 65.6% of reviews |
| Number of ratings | 5 | 1.2K — better |
| Update frequency | Every 2 months | Every 6 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 30 MB | 39 MB |
| Age rating | 4+ | 4+ |
| Developer | REVOLAB Inc. | Tuyen Bui |
Customer experience
nikki
Diary with lock
Bugs and requests
nikki
Not enough reviews yet to summarise bugs or requests.
Diary with lock
Reported bugs
3 issues- Entries randomly disappearing
- Constant redirects to ads when trying to write
- Login/password reset not working properly
Requested features
4 requests- Backup and sync entries across devices
- Fingerprint/Face ID support for locking
- Ability to change font size and color
- Option to disable ads for paid users
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
Diary with lock
- Cloud Sync Monthly$9.991 Month
- Donate to Developer$5.99
- Diary with lock-No Advertising$8.99









