What Is Diarium and What Kind of App Is It?

Updated

Diarium is a private journal and diary app for Windows, Android, iPhone, iPad and Mac. You can start writing without creating an account, and your entries can stay on your device unless you choose to sync them through your own cloud storage. It suits people who want a cross-platform diary with rich entries—photos, files, locations and tags—without a subscription or an account tied to the app itself.

What Diarium is designed to do

Diarium is built around keeping a personal record of daily life and looking back on it later. The core workflow is simple: open the app, write an entry, and optionally attach context such as photos, a location or tags.

The site describes these main capabilities:

  • Private by default: no account is required to start journaling. Entries can remain on your device and can be protected with a password, PIN or biometrics.
  • Cross-platform: the app is available for iPhone, iPad, Mac, Windows and Android.
  • Optional sync through your own cloud: if you want the same journal across devices, sync uses OneDrive, Google Drive, Dropbox, iCloud or WebDAV. Sync requires the Pro version.
  • One-time purchase for Pro: the site states that Diarium Pro is a one-time purchase per platform rather than a subscription.
  • No advertising: the site says journaling is uninterrupted by ads.

Key features and what they are for

Feature What it lets you do
Rich text formatting Use bold, italic, underline, strikethrough, text color and highlight; create bulleted or ordered lists; link to websites or other entries
Attachments Add photos, videos, audio recordings, PDFs or files of other formats, with no stated limit on the number
Tags Organize entries or track things like mood, weight or other metrics
Multiple entries per day Write more than one entry a day or separate parts of an entry with timestamps
Locations and maps Add locations to entries and revisit trips and everyday moments in map view
Calendar and timeline See which days you wrote and scroll through past entries and photos
“On this day” notifications Rediscover past memories from the same date
Dictation Write hands-free by speaking
Integrations Show photos, calendar appointments, social media posts, fitness data and weather as context for an entry
Personalization Choose light or dark themes, an accent color and a custom font

How the privacy and sync model works

The important distinction is between local use and syncing.

  • Without sync: you can journal without an account, and entries can stay on your device.
  • With sync: you enable Cloud Sync in the Pro version and connect your own storage provider. The site lists OneDrive, Google Drive, iCloud, Dropbox and WebDAV as options. This keeps your journal updated across devices while, per the site, leaving you in control of the data in your cloud account.

If you only write on one device and prefer to keep everything local, the no-account, on-device setup is the relevant path. If you switch between a phone and a computer, sync is the feature to check before committing, since it requires Pro.

Who it fits—and what to check first

Diarium is a reasonable fit if you want:

  • a diary across several platforms rather than a single-device app;
  • entries that mix text with photos, audio and files;
  • to avoid creating an app account and to keep data in cloud storage you already use;
  • a one-time Pro purchase instead of a subscription.

Before choosing it, confirm two things on the site or in the store listing for your platform: the current Pro price for that platform (the site describes it as a one-time purchase per platform but does not list prices in the provided material), and whether your preferred cloud provider is among the supported sync options. If you need a web-based diary you can open in a browser, note that the listed platforms are Windows, Android, iPhone, iPad and Mac—not the web.