Diary with Lock: Diary Journal

Review by eFreeware

The most distinctive thing about Diary with Lock is that it treats a journal as something to be guarded rather than merely written. Simple Design Ltd. offers three ways in: a pattern, a four-digit PIN or a fingerprint, with a passcode hint and a retrieval route if the code slips your mind. That framing shapes everything else in the app.

It is built for people who want to write regularly but have hesitated because a notebook or a notes file feels too exposed. Ten million-plus installs and a 4.8 average from more than 408,000 ratings suggest the approach has landed with a large audience since the app arrived in September 2022.

The app is free to install and supported by ads and in-app purchases, so it sits in the same bracket as most mainstream journaling tools. What follows is a look at what the developer describes, where the design choices point, and which writers are likely to get the most from it.

A journal that starts with the lock screen

The core experience is a private writing space. You create entries, and the app keeps them behind the lock you choose. There is no fixed limit on how many text entries you can keep, which matters for anyone who intends to write most days rather than occasionally. The lock is not an afterthought bolted onto a notes app; it is the first thing the developer mentions, and the passcode hint and retrieval features exist so that forgetting the code does not mean losing access permanently.

Once inside, the writing itself is meant to be flexible rather than plain. Entries can be dressed up with fonts, text colors and sizes, and laid over a choice of backgrounds. Emojis are available for quick reactions, and you can add your own pictures. The result is closer to a scrapbook page than a ruled notebook, which is a deliberate choice: the developer frames this as a way to make daily notes more memorable.

Photos and recordings can be inserted into entries as well. That combination turns a written record into something closer to a multimedia log, useful if you want to capture a moment rather than just describe it. For someone who has kept paper diaries and liked the tactile side of them, the decorating options are the closest digital equivalent here.

Backup, mood tracking and finding old entries

Entries can be synced to Google Drive, and restoring them is a one-click process. The practical benefit is that a journal is not tied to a single handset: you can move between devices and bring the archive with you. For a diary, that is arguably the most important feature after the lock itself, because years of writing are only valuable if they survive a lost or replaced phone.

The app also includes a calendar view with mood tracking. You record how you felt over time, and the calendar gives that record a shape, so patterns become visible rather than buried in individual entries. This is the feature that distinguishes the app from a straightforward text journal.

Search works by keyword or by tag. Tags let you group entries by theme, and the developer gives examples such as travel, work or love diaries. If you write about several parts of your life in one place, tagging is what keeps those threads from blending into a single chronological stream. Customizable notifications round this out, covering anniversaries and holidays so that dates you care about are not forgotten.

What it asks of you, and what it costs

The app is free, carries ads and offers in-app purchases, so it is worth going in knowing that the free experience is ad-supported.

Google Drive sync is part of the app, and the backup feature is the whole point of that integration.

There is also a small amount of setup implied by the feature set. You choose a lock type, and you decide whether to use tags, moods and notifications. None of that is heavy, but the app rewards a little organization: a tagged, mood-marked diary is more useful to look back on than an undifferentiated pile of entries.

Support is handled by email, with one-to-one replies to questions and feedback.

The writer this fits best

This app suits someone who wants to write often and privately, and who values being able to look back at how a period of life felt rather than only what happened. The lock, the mood calendar and the tagging system all point in that direction. It also suits people who like their entries to look good, since fonts, backgrounds, pictures and emojis are treated as part of the writing rather than extras.

It fits well for keeping a record of a specific ongoing subject: a relationship, a job search, a training plan, a child's early years. Tags and the calendar view make those longer arcs easier to follow. The Google Drive backup matters most to anyone who has lost a phone before and does not want to repeat the experience with years of writing.

Someone who wants a bare, distraction-free text editor with no decoration options would find the styling side of this app beside the point. The app is built around privacy plus portability plus presentation, and that combination is what you are choosing.

A dependable home for daily writing

Diary with Lock does a few things and does them in a way that makes sense together. The lock protects the writing, the Drive sync preserves it, the calendar and tags make it navigable, and the styling options make it pleasant to add to. A 4.8 average across more than 408,000 ratings, on an app with over ten million installs, is the kind of signal that usually reflects a tool people keep using rather than try once.

The trade-offs are ads and in-app purchases in a free app. Neither is unusual, and neither undermines the core function, but they are part of the deal. The app was last updated in August 2026, which suggests ongoing attention rather than an abandoned project.

If you want a private, decorated, searchable journal that follows you between phones, this is a reasonable place to start. If you want plain text with no styling and no cloud, the app's strengths would be wasted on you. For most people keeping a daily diary on Android, the balance here looks right.