If you use Windows and you've tried to find a good journaling app, you've probably hit the same wall I did. The apps everyone links to, Day One, Apple Journal, are Mac and iPhone only. Cozy is the one I built to run on a PC, and it runs on Mac too.
Diary software for Windows
Cozy gives you a dated entry and a calendar to walk back through, and every day you write becomes a file in a folder you chose. If you've been looking for diary software for Windows and kept landing on Mac-only apps or web pages that want an account, this is the desktop one.
A desktop program on your PC
Cozy installs like any other program, lives in your taskbar and system tray, and doesn't need a browser tab. Windows 10 and Windows 11 both work.
Your journal is a folder of files on your PC
- Plain files. Every entry is a text file in a folder you choose. You can read them in Cozy, in Notepad, or in any editor.
- No account, no server. There's nothing to sign into, and your entries never leave your PC through me. Cozy works fully offline.
- No cloud lock-in. Because it's your folder, your journal doesn't live inside anyone's app. You can move it, back it up, or leave.
Windows already knows how to look after a folder
Because every entry is its own file, named by the date you wrote it, the tools already on your PC work on your journal without any help from me. File Explorer sorts it by date and finds an entry by name. File History or OneDrive backs the folder up the way they back up anything else, versions included. Copying your journal to another PC is copying a folder. There is no export step, no proprietary backup file, and nothing that stops working if Cozy does.
Quick entry from the system tray
Cozy sits in your system tray with a global keyboard shortcut. Press it and a small window opens so you can jot a line without leaving whatever you're doing. Spellcheck follows your system language. You can drop photos, including iPhone HEIC, plus video (.mov) and audio right into an entry.
One purchase, all your machines
Cozy is a one-time $49, no subscription. One purchase covers all your Windows PCs, all your Macs, your iPhone and your iPad. There's no monthly fee, because there's no server on my end to keep running.
About the SmartScreen warning
The first time you run the Windows installer, you may see a blue "Windows protected your PC" screen. That's SmartScreen, and it shows up because my installer isn't signed with a big-name certificate yet, not because anything is wrong. It's safe: click "More info," then "Run anyway." There are step-by-step notes on the download page.
Same journal on Windows and Mac
Because your journal is just a folder, you're not tied to one machine. Keep the folder in your own OneDrive, Dropbox, or Google Drive and open the same journal from Cozy on a PC at your desk and a Mac on the couch. Your sync service handles the syncing; Cozy just reads the files.
How does Cozy compare to other Windows journal apps?
Where another app beats Cozy on Windows, the table and the notes below say so.
| Cozy | Day One | Diarium | Obsidian | |
|---|---|---|---|---|
| Price model | One-time: $49, all your PCs, Macs, iPhones and iPads | Subscription: $49.99–$74.99 / year | Cheap per platform · Premium subscription for extras | Free · Sync $48 / year |
| Where entries live | Plain text files in a folder you pick | Day One's servers, own format, end-to-end encrypted | Its own database | Plain text files in a folder you pick |
| Offline | Yes, there's no server to reach | Sync needs a connection | Yes, syncs when you reconnect | Yes, files are on your disk |
| Built for a dated journal | Yes, calendar, dated entries, moods | Yes | Yes, plus automatic life-logging | No, you build it yourself |
| Sync | You set it up: OneDrive, Dropbox, any folder sync | Built in and handled for you | OneDrive, Google Drive, Dropbox, Diarium Cloud | Obsidian Sync, or your own folder sync |
Day One on Windows
Day One does have a Windows app now, and it's polished. If you want sync handled for you across a PC, a phone, and a tablet, it does that better than Cozy does. But it's $49.99 a year for Silver or $74.99 for Gold, and your entries sit on Day One's servers in a format only Day One reads. Cozy vs Day One →
Diarium
The most Windows-native journal of the bunch, and good if you like a diary that fills itself in, steps, weather, photos, social posts. Entries live in its own database and sync through OneDrive, Google Drive, Dropbox, or Diarium Cloud. If automatic life-logging is the appeal, it beats Cozy at it. Cozy vs Diarium →
Obsidian
Free on Windows, and it shares Cozy's central idea: your writing is plain text files in a folder you own. Plenty of people journal in it. The difference is how much setup it asks for, folders, tags, templates, plugins, and no calendar or dated entry unless you build one. Cozy vs Obsidian →
Where Cozy falls short on Windows
Two things: the installer isn't signed with a big-name certificate yet, so SmartScreen warns on it the first time (safe, but an extra click and a moment of doubt). And the phone app is iPhone only for now, so if you carry an Android, Day One will serve you better today. There's also no sync service: you drag the folder into OneDrive or Dropbox yourself, which takes a minute and then works.
If you got here from Reddit
A lot of "best journaling app for Windows" threads end with people recommending Mac-only apps to someone who clearly said they're on a PC. If that's how you found this page, Cozy is what I'd have posted instead, a plain-files journal that actually runs on Windows, made by someone who got tired of the same non-answers.
Head-to-head: Cozy vs Day One, Cozy vs Diarium, Cozy vs Obsidian.
Related reading: the best journaling apps in 2026, a journal app for Mac, a journaling app without a subscription, and an offline journaling app.
“I've been using it for a week and I do not regret the purchase at all! :) Very solid, intuitive and aesthetic. I synced with two of my computers to be able to access it from bed, which is where I like to do my digital journaling, and works like a charm. I hope your app continues to grow!”
u/sorabood