A journal app that syncs between devices

Most journal apps can sync between your phone, tablet and computer, but they do it in different ways. The two questions that matter are which devices you need, and where your entries travel. If you only use Apple devices, Apple Journal and Ember sync through your own iCloud. If you also use Windows or Android, Day One and Diarium are the apps that reach them.

This guide compares how four journal apps sync, what it costs, and what happens when you write offline. I make one of them, Ember, so I've tried to be plain about where the others fit better.

The quick comparison

Checked against each app's own site in October and November 2026. Prices change; check there for the latest. Full comparisons: Apple Journal, Day One, Diarium.

First question: which devices?

Be honest about where you actually write. Many people journal on a phone at night and want to reread on a laptop. Others write long entries at a desk and glance back on the go.

• Only Apple devices: every app here works. Apple Journal is free and simple; Ember is built around the people you write about; Day One and Diarium do more of everything.
• Apple plus a Windows PC: Day One or Diarium.
• Android phone: Day One or Diarium. Apple Journal and Ember don't run on Android.
• Writing in a web browser: Day One.

Second question: where do your entries go?

Sync means your journal leaves one device to reach another. There are two broad ways apps do it.

Through the company's own servers. You create an account, and the app keeps your journal on its servers so every device can reach it. Day One works this way, and encrypts entries end to end so the company can't read them. The upside is that it reaches every platform. The trade-off is one more account, and a service you depend on.

Through storage you already own. The app syncs through your own iCloud, Google Drive, Dropbox or similar, and the company never holds your journal at all. Apple Journal, Diarium and Ember work this way. There's no extra account to create, and if the app's company disappeared tomorrow, your files would still be in your own storage.

Neither is wrong. For a journal, I lean towards storage you own: the fewer places your private writing lives, the better. But it's worth knowing which you're choosing.

What happens when you write offline

A good journal app lets you write anywhere, then catches up when you're back online. All four work offline on the device you're holding.

The harder case is editing the same entry on two devices before they've synced: a few lines on your phone on the train, then a different change on your laptop at home. Apps handle this differently. In Ember, the changes are merged when the devices meet, and if two edits truly clash, both versions are kept, so nothing you wrote is silently thrown away.

Sync is not a backup

One thing people learn the hard way: sync copies mistakes too. Delete an entry on your phone and it disappears from your laptop a moment later. So keep a real backup as well.

• Export your whole journal now and then, to a format other apps can read.
• Keep one copy somewhere separate from the sync service, such as an external drive.
• Check that the export includes your photos, not just text.

Ember's backup is a single file in plain JSON with your original photos, free on every plan, and you can print the whole journal as a book.

How Ember syncs

Ember is free on iPhone, iPad and Mac, and every device works on its own. If you want your journal on all of them, Ember Plus syncs through your own iCloud. There's no Ember account to create and no Ember server in the middle; your journal goes from your device to your iCloud and back. If you stop paying for Plus, sync stops, but your journal stays on each device and your exports keep working.

Common questions

Does the Apple Journal app sync across devices?

Yes. Apple Journal syncs between your iPhone, iPad and Mac through iCloud, at no extra cost.

Which journaling apps are cross-platform?

Day One runs on Apple devices, Android, Windows and the web. Diarium runs on Windows, Android, Apple devices and Chromebooks. Apple Journal and Ember are for iPhone, iPad and Mac only.

Is there a free journal app that syncs between devices?

Apple Journal syncs for free across Apple devices. Most other apps include sync in a paid plan: Day One Silver, Diarium Pro, or Ember Plus.

Can I sync my journal without creating an account?

Yes. Apple Journal, Diarium and Ember sync through storage you already have, such as iCloud, so there's no separate account. Day One needs a Day One account for sync.

What happens to my journal if I stop paying for sync?

It depends on the app. In Ember, your journal stays on each device and you can keep writing and exporting; only syncing stops.