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Is Diary Private Note With Lock Safe?

Diary Private Note With Lock privacy label · by 俊川 林 · checked November 2026

  • Tracks you
  • Not updated in 2+ years
App Privacy label Developer-reported · checked November 1, 2026
Used to track you
4types
Linked to you
4types
Not linked to you
0types

None declared

Short answer

It depends on how you feel about tracking: Diary Private Note With Lock declares data used to track you. None of it falls in Apple's most sensitive categories (health, financial, location, contacts or your own content). In total the label lists 4 data types; 32% of journal & diary apps we checked declare tracking.

At a glance

Diary Private Note With Lock 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

Diary Private Note With Lock's developer reports using identifiers, usage data, diagnostics, other data to track you across other companies' apps and websites.

Try it

Did Diary Private Note With Lock ask for something?

Pick the permission prompt you saw. We compare it with what Diary Private Note With Lock's developer declared.

It asked me for access to…
Tap a prompt to compare it with the label.
Not on the label

Location is not on Diary Private Note With Lock'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

User Content is not on Diary Private Note With Lock'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 Diary Private Note With Lock'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

Diary Private Note With Lock 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 Diary Private Note With Lock'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 Diary Private Note With Lock collects, explained

Data typeWhat it coversWhere to limit it
IdentifiersUsed to track youLinked 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 youLinked 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.
Other DataUsed to track youLinked to you Any data the developer did not fit into Apple's named categories. Read the app's privacy policy, linked from its App Store page.
DiagnosticsUsed to track youLinked 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 Diary Private Note With Lock's label means for you

Diary Private Note With Lock's label has 4 types under “Data Used to Track You”, 4 types under “Data 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 identifiers, usage data, diagnostics, other data from Diary Private Note With Lock 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.

None of the data types fall into the categories most people consider sensitive: health, financial information, precise location, contacts, browsing history or the content you create.

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. Diary Private Note With Lock 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 Diary Private Note With Lock

  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

    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.

  3. 3

    Notifications

    Settings › Notifications › Diary Private Note With Lock › Show Previews: When Unlocked keeps message and account details off the Lock Screen.

Cross-app tracking

Does Diary Private Note With Lock track you?

Yes — 4 data types

Identifiers, usage data, diagnostics and other 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 Diary Private Note With Lock track you? Full answer and how to stop it →

iOS 18 and later

Lock Diary Private Note With Lock behind Face ID

  1. Find Diary Private Note With Lock 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. Diary Private Note With Lock now asks for authentication every time it opens.

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

Lock or hide Diary Private Note With Lock: step-by-step guide →

From the App Store record

About Diary Private Note With Lock

Developer俊川 林
App Store categoryLifestyle (also Productivity)
Latest version7.0, released October 2022
First releasedMarch 2019
RequiresiOS 11.0 or later
Size88 MB
Age rating4+
Languages5 (EN, JA, KO, ZH, ZH)
Bundle IDcom.lhz.Diary

The current version shipped in October 2022, 4 years before our snapshot. Apps that are not updated may not support newer iOS privacy controls, and an abandoned app will not get security fixes.

Also by 俊川 林: OnlyPass.

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 Diary Private Note With Lock 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 Diary Private Note With Lock's developer: Can anyone at the company read my entries?

How it compares

Diary Private Note With Lock 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 identifiers → Privacy label decoder →

Do it now

Your Diary Private Note With Lock 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. Q1Diary Private Note With Lock's privacy label says it uses data to track you.
    Right.
    Not quite.

    True: it lists identifiers, usage data, diagnostics and other 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. Q3Diary Private Note With Lock collects Identifiers.
    Right.
    Not quite.

    True: Identifiers 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

Diary Private Note With Lock privacy FAQ

Is Diary Private Note With Lock safe to use?
Based on its App Store privacy label, diary Private Note With Lock's developer reports using identifiers, usage data, diagnostics, other 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 Diary Private Note With Lock track you?
Yes. Its label lists identifiers, usage data, diagnostics and other data under Data Used to Track You. You can decline at the iOS tracking prompt.
What data does Diary Private Note With Lock collect?
Identifiers, usage data, other data and diagnostics. Of these, identifiers, usage data, other data and diagnostics are linked to your identity.
Who makes Diary Private Note With Lock?
俊川 林, according to the App Store. It was first released in March 2019 and the current version is 7.0.
Can I lock Diary Private Note With Lock with Face ID?
On iOS 18 or later, touch and hold Diary Private Note With Lock'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 Diary Private Note With Lock 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. Diary Private Note With Lock 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 Diary Private Note With Lock'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 Diary Private Note With Lock?
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 Diary Private Note With Lock on the App Store, as reported by the developer. Checked 2026-11-01. How we collect data · Report a correction