Day One is the journaling app most people land on first. It's polished, it's everywhere, it works. I used it for a while. I built Cozy because I wanted something different: a journal that lives on my own computer, in files I can open with any app, that I pay for once.
The short version
- Where your entries live. Day One stores them on their servers. Cozy stores them in a folder on your Mac.
- What format they're in. Day One uses its own format that only its app can read. Cozy uses simple text files any app can open.
- How you pay. Day One is a yearly subscription ($49.99 or $74.99 per year, depending on the tier). Cozy is $35 once for desktop, with Cozy for iPhone included.
- What happens if the app disappears. With Day One, you need to export. With Cozy, you open your folder.
Where your journal lives
Day One keeps your entries on their servers and syncs them down to your devices. They use end-to-end encryption, which is genuinely good. But the entries are still stored in a place you don't directly control, in a format only Day One can read.
Cozy doesn't have a server. Your entries are saved as regular files inside a folder you choose. You can open that folder right now and read your entries in any text editor. They're just files.
How sync works
Day One handles sync for you. That's convenient, and it's part of what you pay for.
Cozy doesn't handle sync. But because your journal is just a folder, you can put it inside iCloud, Dropbox, or any similar service and it syncs the same way your other files do. One less service to trust, one less account to manage. If Cozy for iPhone is part of your setup, use iCloud Drive — it's the only folder an iOS app is allowed to read.
About the AI features
Day One's Gold tier is built around AI. Cozy doesn't have any AI, and that's a deliberate choice. I wrote a longer post about why Cozy doesn't have AI if you want the full reasoning. The short version: I don't want a chat window or autocomplete in the place where I write the most personal things I write.
Pricing
Day One has a free Basic tier with limits (one photo per entry, no sync across devices). To get the full app you pay $49.99 a year for Silver, or $74.99 a year for Gold (which adds AI features). You keep paying every year to keep using it.
Cozy is $35, once, for the desktop app. One license covers every Mac and Windows you own, and Cozy for iPhone comes with it. On its own the iPhone app is $19.99, once. No subscription, ever.
Put another way: buying Cozy for your computer and your phone outright costs less than two years of Day One Silver. After that the yearly bills stop, because there aren't any.
If the company goes away
This is the part I think about most. If Day One shuts down or changes direction, you have to export your entries before you lose access. If you miss the window, your journal is gone.
If Cozy shuts down, you open your folder and keep going. The files were always yours. That's the whole point.
So which one is for you?
If you want sync handled for you across every device you own, including Android and the web, and you don't mind paying every year, Day One does that better than anyone.
If you want a quiet journal that lives on your own Mac, PC and iPhone, in files you control, paid for once, that's what Cozy is for.
Comparing other apps? Read Cozy vs Obsidian, Cozy vs Bear, Cozy vs Diarium, or Cozy vs Apple Journal.