Comparison

Diary with lock vs MiiBook Journal

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Password & PIN code protection
  • Customizable background colors
  • Changeable font styles
  • Easy-to-use interface
  • Searchable entries
  • Unlimited entries
  • Multi-language support
Features
Read full description

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

About

MiiBook Journal

This personal diary app offers a clean and engaging interface for easy daily journaling. It allows for quick entries, calendar reflections, and automatic monthly summaries. Prioritizing privacy, all data is stored locally on your device.

Highlights
  • Instant entry upon opening
  • Calendar reflections
  • AI monthly summaries
  • Dark mode support
  • Reminder notifications
  • Home Widget
  • Local data storage
Read full description

MiiBook is your simple, personal diary app. We've made a conscious effort to provide a clean, engaging design that you won't tire of. Operation is easy, with no account registration required. Simply install the app and start using it immediately. 【Features】 ・Write a quick line or take your time ・Instant entry upon opening the app ・Easy reflections via calendar ・Switch calendar views by month ・Dark mode compatible ・Never forget to log with reminder notifications ・Only you have access to your data ・Home Widget ・AI automatically generates monthly summaries! ■ Write a quick line or take your time On busy days, jot down a single line. When you have time, write in detail. With the freedom to match your mood, keeping a daily diary is easier than ever. ■ Instant entry upon opening the app MiiBook is committed to a user-friendly experience. Tap the blank date field from the home screen and the keyboard appears for immediate input. ■ Easy reflections via calendar You can reflect on your diary entries in a calendar format. Reviewing past entries can help you recognize your personal growth and emotional changes. ■ Switch calendar views by month Simply swipe left or right to review your past records. ■ Dark mode compatible The app is friendly on the eyes and also supports dark mode. The theme switches according to your device settings. Enjoy the app in your favorite theme. ■ Never forget to log with reminder notifications Of course, reminder notifications are also supported. We support the habit of daily journaling with daily notifications. You can also turn off notifications. ■ Only you have access to your data Your journal entries are stored only on your device. Therefore, you can comfortably record your thoughts and feelings. 【Recommended for those who】 ・Felt other diary apps were complicated with unnecessary features. ・Want to use a simple diary app. ・Desire a diary app that they won't tire of. ・Prefer an app that allows quick and easy entries. ・Prioritize privacy and want their data stored only on their device. Terms of Use: https://tinylab-apps.web.app/TermsOfService/ja.html Privacy Policy: https://tinylab-apps.web.app/PrivacyPolicy/ja.html

Screenshots

Diary with lock4 screens
MiiBook Journal4 screens

Verdict

The call

The clearest difference is rating: MiiBook Journal at 4.8 against Diary with lock's 4.3. Diary with lock's advantage is ads (none vs shown) and ratings volume (1.2K vs 5). On price, review sentiment, update cadence and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Diary with lock sells 3 in-app purchases, starting at $9.99 per month and MiiBook Journal sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

MiiBook Journal holds the better App Store score, 4.8 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 complicate that: 66% of Diary with lock's written reviews are positive against 63% of MiiBook Journal's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Diary with lock ships an update every 6 weeks, MiiBook Journal monthly. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 7 level
Diary with lock versus MiiBook Journal: the parameters behind the verdict, then further details
ParameterDiary with lockMiiBook Journal
PriceFreeFree
Rating4.3 (1.2K ratings)4.8 (5 ratings) — better
Positive reviews65.6% of reviews — better62.5% of reviews
Number of ratings1.2K — better5
Update frequencyEvery 6 weeksMonthly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size39 MB153 MB
Age rating4+4+
DeveloperTuyen BuiRyunosuke Nagase

Customer experience

Diary with lock

All ratings1,247 ratings
Positive81.7%
Neutral5.0%
Negative13.3%
Written reviews160 reviews
Positive65.6%
Neutral8.1%
Negative26.3%

MiiBook Journal

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews16 reviews
Positive62.5%
Neutral0.0%
Negative37.5%

Bugs and 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

MiiBook Journal

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Diary with lock

Subscriptions1
  • Cloud Sync Monthly$9.991 Month
One-time2
  • Donate to Developer$5.99
  • Diary with lock-No Advertising$8.99
3 purchases

MiiBook Journal

Subscriptions2
  • PREMIUM - MONTHLY$1.991 Month
  • PREMIUM - ANNUAL14 Days trial$22.991 Year
One-time1
  • PREMIUM - LIFETIME$49.99

Questions

Is Diary with lock free?
Diary with lock is free to download, with in-app purchases available.
Is MiiBook Journal free?
MiiBook Journal is free to download, with in-app purchases available.
Which has better reviews, Diary with lock or MiiBook Journal?
MiiBook Journal is rated higher. Diary with lock averages 4.3 out of 5 from 1.2K ratings, while MiiBook Journal averages 4.8 from 5 ratings.
Do Diary with lock or MiiBook Journal have ads?
MiiBook Journal shows ads; Diary with lock does not.
Which is updated more often, Diary with lock or MiiBook Journal?
Diary with lock ships an update every 6 weeks, and MiiBook Journal monthly. Most recently, Diary with lock was updated on October 29, 2026 and MiiBook Journal on October 24, 2026.

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