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Is MiiBook Journal Safe?

MiiBook Journal privacy label · by Ryunosuke Nagase · checked November 2026

  • Tracks you
  • Collects location
App Privacy label Developer-reported · checked November 1, 2026
Used to track you
3types
Linked to you
0types

None declared

Not linked to you
4types
Short answer

It depends on how you feel about tracking: MiiBook Journal declares data used to track you. The sensitive items are location. In total the label lists 4 data types; 32% of journal & diary apps we checked declare tracking.

At a glance

MiiBook Journal privacy in one look

Data exposure on the label
Used to track you
  1. 1
  2. 2
  3. 3
  4. 4

Built only from the developer's App Store label. It describes disclosure, not tested behaviour.

Verdict from the label
Tracks you

MiiBook Journal's developer reports using location, identifiers, usage data to track you across other companies' apps and websites.

Try it

Did MiiBook Journal ask for something?

Pick the permission prompt you saw. We compare it with what MiiBook Journal's developer declared.

It asked me for access to…
Tap a prompt to compare it with the label.
Matches the label

MiiBook Journal lists Location on its label, including for tracking. Choose While Using and turn off Precise Location if the feature works without it.

Not on the label

User Content is not on MiiBook Journal's label. That can be fine: data used only on your iPhone does not have to be declared. If the data would need to leave the phone for the feature to work, ask why it is missing.

Not on the label

Contacts is not on MiiBook Journal's label. That can be fine: data used only on your iPhone does not have to be declared. If the data would need to leave the phone for the feature to work, ask why it is missing.

Expected — and you can decline

MiiBook Journal declares data used to track you, so expect the “Allow to track?” prompt. Tap Ask App Not to Track; the app must keep working without it.

Not on the label

Health & Fitness is not on MiiBook Journal's label. That can be fine: data used only on your iPhone does not have to be declared. If the data would need to leave the phone for the feature to work, ask why it is missing.

A permission is what the app can reach on your iPhone; the label is what the developer says leaves it. They answer different questions.

Line by line

What MiiBook Journal collects, explained

Data typeWhat it coversWhere to limit it
LocationSensitiveUsed to track youNot linked to you Where your phone is, either precisely (street level) or approximately (city or area). Settings › Privacy & Security › Location Services: choose Never or While Using, and turn off Precise Location if the app does not need it.
IdentifiersUsed to track youNot linked to you An account ID, screen name, customer number or a device-level ID such as the advertising identifier. Settings › Privacy & Security › Tracking: turn off Allow Apps to Request to Track, or tap Ask App Not to Track when prompted.
Usage DataUsed to track youNot linked to you What you tap, open and view inside the app, plus which ads you have seen. There is no single iOS switch. Look for an analytics or personalised-ads toggle in the app's own settings.
DiagnosticsNot linked to you Crash logs, launch times, hang rates and energy use. Settings › Privacy & Security › Analytics & Improvements › Share With App Developers controls what Apple passes on; the app's own crash reporting is separate.
Reading the label

What MiiBook Journal's label means for you

MiiBook Journal's label has 3 types under “Data Used to Track You”, 4 types under “Data Not Linked to You”. A data type can appear in more than one section when it is used for different purposes — for example, identifiers used for both analytics and advertising.

Tracking is the declaration that most separates apps. It means location, identifiers, usage data from MiiBook Journal can be combined with data from other companies to target or measure ads, or shared with data brokers. On iOS 14.5 and later, the app must ask your permission before tracking you through the advertising identifier; answering “Ask App Not to Track” blocks that identifier and tells the developer you have declined.

The items that deserve the most attention are location. Location history reveals home, work and routines. Precise location deserves the most scrutiny.

Journals collect your private thoughts, moods and often your location and photos. A lock screen inside the app is not the same as encryption of the synced entries. Check whether entries sync to the developer's server and whether that sync is end-to-end encrypted; export your journal regularly.

Among the 173 journal & diary apps in our snapshot with a label, 32% declare tracking, 54% collect data linked to you and 21% say they collect nothing. MiiBook Journal lists 4 data types, more than the average of 2.9 for this group.

Lifestyle apps cover family, home and personal organisation, and often combine location, contacts and photos in one place.

On your iPhone

Settings to check for MiiBook Journal

  1. 1

    Tracking

    Settings › Privacy & Security › Tracking. If “Allow Apps to Request to Track” is off, apps cannot ask, and they are told to treat you as having declined. You can also turn it off for this app alone.

  2. 2

    Location

    Settings › Privacy & Security › Location Services › MiiBook Journal. Choose While Using or Never, and switch off Precise Location if a city-level answer is enough.

  3. 3

    Lock the app

    On iOS 18 and later, touch and hold the icon and choose Require Face ID. Anyone who picks up your unlocked phone then needs your face, fingerprint or passcode to open it.

  4. 4

    Notifications

    Settings › Notifications › MiiBook Journal › Show Previews: When Unlocked keeps message and account details off the Lock Screen.

Cross-app tracking

Does MiiBook Journal track you?

Yes — 3 data types

Location, identifiers and usage data. Apple defines tracking as linking data from this app with data from other companies' apps, websites or offline sources for targeted advertising or ad measurement, or sharing it with a data broker.

Does MiiBook Journal track you? Full answer and how to stop it →

iOS 18 and later

Lock MiiBook Journal behind Face ID

  1. Find MiiBook Journal on your Home Screen or in App Library.
  2. Touch and hold the icon until the quick-actions menu opens.
  3. Tap Require Face ID (or Require Touch ID / Require Passcode, depending on your iPhone).
  4. Tap Require Face ID again to confirm. MiiBook Journal now asks for authentication every time it opens.

The lock is an iPhone feature, so it works whether or not MiiBook Journal has a passcode of its own. It does not change what the app sends to its developer.

Lock or hide MiiBook Journal: step-by-step guide →

From the App Store record

About MiiBook Journal

DeveloperRyunosuke Nagase
App Store categoryLifestyle (also Health & Fitness)
Latest version6.2.2, released March 2026
First releasedJuly 2023
RequiresiOS 15.0 or later
Size153 MB
Age rating4+
Languages2 (EN, JA)
Bundle IDcom.nosuke.lineaday

The current version shipped in March 2026. That is recent enough that the label should reflect current practices, but check the App Store page again before relying on it.

Read with care

What the label cannot tell you

  • A label is self-reported. Apple publishes the developer's answers and can reject apps that misrepresent them, but it does not independently verify what MiiBook Journal sends.
  • It does not say where data is stored, how long it is kept, whether it is encrypted, or which companies receive it. The privacy policy covers those points.
  • Optional data counts: if a feature lets you add something (a profile photo, a phone number), the type is listed even if you never use the feature.
  • Data handled only on your iPhone is not 'collected', so a no-collection label is compatible with an app that reads your files locally.
  • Third-party sign-in, payment processors and SDKs are supposed to be included, but a label can lag behind a new version.

The question to ask MiiBook Journal's developer: Can anyone at the company read my entries?

How it compares

MiiBook Journal vs similar journal & diary apps

Data types listed on each App Store privacy label
Tracks youLinked to youNot linkedCollects nothing

Fewer types is not automatically safer: a cloud backup app has to collect your files to work. Compare like with like.

Checking another app?

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All journal & diary apps → Who tracks you? A–Z → Apps that collect location → Privacy label decoder →

Do it now

Your MiiBook Journal privacy checklist

Tick what you have done
Tick each step as you do it on your iPhone.

Done. You have applied every control the label points to.

Quick quiz

True or false?

  1. Q1MiiBook Journal's privacy label says it uses data to track you.
    Right.
    Not quite.

    True: it lists location, identifiers and usage data under Data Used to Track You.

  2. Q2Apple tests every app to confirm its privacy label is accurate.
    Right.
    Not quite.

    Labels are self-reported by developers. Apple can reject or remove apps that misrepresent practices, but it does not audit each label.

  3. Q3MiiBook Journal collects Location.
    Right.
    Not quite.

    True: Location appears on its label.

  4. Q4Data “Not Linked to You” is never sent off your iPhone.
    Right.
    Not quite.

    It is collected and sent; the developer says it is de-identified rather than tied to your account or device.

  5. Q5Tapping “Ask App Not to Track” can stop an app from working.
    Right.
    Not quite.

    Apple's rules require apps to work the same whether or not you allow tracking.

Questions people ask

MiiBook Journal privacy FAQ

Is MiiBook Journal safe to use?
Based on its App Store privacy label, miiBook Journal's developer reports using location, identifiers, usage data to track you across other companies' apps and websites. Whether that is acceptable depends on what you will store in it. The label is developer-reported, not an independent security test.
Does MiiBook Journal track you?
Yes. Its label lists location, identifiers and usage data under Data Used to Track You. You can decline at the iOS tracking prompt.
What data does MiiBook Journal collect?
Location, identifiers, usage data and diagnostics. Of these, location, identifiers and usage data are linked to your identity.
Who makes MiiBook Journal?
Ryunosuke Nagase, according to the App Store. It was first released in July 2023 and the current version is 6.2.2.
Can I lock MiiBook Journal with Face ID?
On iOS 18 or later, touch and hold MiiBook Journal's icon and choose Require Face ID (or Touch ID / Passcode). This is an iPhone feature and works for most downloaded apps, whether or not the app has its own lock.
How does MiiBook Journal compare with other journal & diary apps?
Across 173 journal & diary apps with labels in our snapshot, 32% declare tracking and 21% say they collect no data. MiiBook Journal lists 4 data types against an average of 2.9.
Can anyone at the company read my entries?
The privacy label cannot answer that. Look for it in MiiBook Journal's privacy policy or support pages, linked from the App Store listing. Check whether entries sync to the developer's server and whether that sync is end-to-end encrypted; export your journal regularly.
How do I delete my data from MiiBook Journal?
Apps that let you create an account must also let you start account deletion from inside the app (an App Store rule since June 2022). Deleting the app from your iPhone alone does not delete data already sent to the developer.
Facts on this page come from MiiBook Journal on the App Store, as reported by the developer. Checked 2026-11-01. How we collect data · Report a correction