One diary app for iPhone, Android, Mac, Windows, and the web
Your day does not happen on one device, so your journal should not be stuck on one either. Purple Diary is a cross-platform diary app that runs on iPhone, iPad, Apple Watch, Mac, Android, Wear OS, Windows, and the web, with a single journal kept in sync across all of them. It is free, has no ads, and stays locked wherever you open it.
A platform list that is genuinely rare
Plenty of journal apps cover iPhone and Android and call it done. A few add a Mac app or a website. Purple Diary goes further: iOS, iPadOS, watchOS, macOS, Android, Wear OS, Windows, and a full Web app. Two of those stand out. A real Windows app, installed from the Microsoft Store rather than a browser tab, is uncommon for diary apps. So is proper Wear OS support alongside the Apple Watch. If you live partly on a PC or a watch, that gap usually means leaving your journal behind. Here it does not.
The point of a cross-platform diary app is not the length of the list for its own sake. It is that whichever screen happens to be in your hand, the same journal is already there, ready to write in.
Write on your phone, finish on your laptop
Most entries do not get written in one sitting. You jot a few lines on your phone on the train, think about it through the afternoon, then sit down at a real keyboard that evening to finish the thought. Because your entries sync, the draft you started on iPhone or Android is waiting on your Mac or Windows PC exactly where you left it. No copying text between apps, no emailing yourself a note. You pick the entry back up and keep going.
The writing tools come along for the ride too. The rich text editor, photo attachments, and voice notes behave the same on a laptop as they do on a phone, so switching devices never means switching to a worse version of the app.
A watch for the quick notes
Some thoughts will not survive the trip to your pocket and back. Apple Watch and Wear OS support let you capture a quick note or log a mood from your wrist in the moment, before it slips away. It is the smallest screen you own doing the one job it is perfect for: catching the fleeting line that you will expand into a fuller entry later, on a bigger device.
One journal, everywhere you look
Spreading across devices only helps if it stays one journal rather than several half-empty ones. Purple Diary keeps a single library of entries, moods, photos, and tags in sync, so what you write on one device shows up on the rest. Your ten theme colors, fonts, and feed display settings travel with you as well, which means the app feels like yours no matter where you open it. If you mostly write from a browser, the online diary works the same way and needs nothing installed.
The lock stays in place across devices
Syncing a private journal raises a fair question: is it still private once it is everywhere? With Purple Diary, yes. The app lock with a PIN, and biometric unlock with Face ID, Touch ID, or a fingerprint on supported devices, applies on each device rather than just the first one you set up. Add a new phone or sit down at the Windows app, and your journal is still sealed until you unlock it. You can read more on the diary app with a lock page. Purple Diary is rated 4.5 stars by more than 500 people, and being genuinely everywhere, without ads and without giving up the lock, is a large part of why.
Frequently asked questions
Which devices does Purple Diary run on?
Purple Diary runs on iPhone, iPad, Apple Watch, Mac, Android, Wear OS, Windows, and the web. It is one app across all of them, and your journal stays in sync wherever you open it.
Is there a real Windows diary app?
Yes. Purple Diary has a native Windows app in the Microsoft Store, not just a website. A full desktop app and Wear OS support are both unusual among diary apps, which is part of why the platform list is so wide.
Does my journal sync across devices?
Yes. Your entries, moods, photos, and tags sync across your devices, so you can start writing on one and finish on another. The app lock stays in place everywhere, so a synced journal is still a private one.
Is the cross-platform diary app free?
Yes, Purple Diary is free to download and use on every platform, with no ads. An optional subscription and a one-time lifetime purchase add extra features, but core journaling, sync, and the lock are free.