Phat, who makes Natus, listed Cozy on his page of Day One alternatives and asked me to put Natus here, honestly. So this is the honest version. We're both building for people leaving Day One, and we built opposite things.
The short version
- What it does with your writing. Natus reads it and writes back. Cozy stores it and does nothing else.
- Where your entries live. Natus keeps them on its servers. Cozy keeps them as plain text files in a folder you picked.
- How you pay. Natus Pro is $12.99 a month or $99.99 a year. Cozy is $49 once.
- Where it runs. Natus is on iPhone. Cozy is on Mac, Windows, iPhone and iPad.
What Natus does
You give Natus your name and your birth date, time and place, and before you've written a word it hands you a reading: your strengths, what drives you, the patterns you tend to fall into. Then you write, talk or snap a photo, and it connects what you shared with that reading. Each day there's something new to consider. On Sunday, a letter about your week.
It's made for people who feel stuck and want a starting point, and who don't want the pressure of a daily writing habit. A blank page asks you to work everything out alone. Natus doesn't.
What Cozy does
Cozy is the blank page. You open it, you write, and the entry lands as a file in a folder on your computer. It has a calendar, photos, tags and search, and that's where it stops. Nothing summarises your week or tells you what it means. The understanding is yours to do, by writing and by reading back.
Where your journal lives
Natus stores and syncs your journal through Supabase, and sends what it needs to AI model providers, through the Vercel AI Gateway, to write its replies and readings. Its policy says those models don't train on what it sends, that your journal is never shared with Meta or TikTok, and that deleting the app doesn't delete the data on its servers (there's a delete-my-account option in Settings for that). The app also carries Meta and TikTok measurement for installs and purchases.
Cozy has no server. Every entry is a plain text file in a folder you chose. You can open it in Finder or Explorer right now and read your journal in TextEdit or Notepad. I can't see it, and no model reads it.
Pricing
Natus is free to start: your first reading, unlimited private journal writing, daily insights for the first 7 days, and 3 messages a week with Natus. Pro is $12.99 a month, or $99.99 a year with a 7-day trial and the full Blueprint.
Cozy is $49, once, for every Mac, Windows PC, iPhone and iPad you own. You can try it free for 7 days with every feature, and if it isn't for you, I refund it in full within 14 days. There's no subscription, because there's no server on my end to keep paying for.
Where Natus is better
If you want something to reflect with rather than something to write in, Natus is the one. It gives you a place to start before you've written anything, it answers back, and it works with one line a day or a voice note on the walk home. Cozy asks more of you. It gives you an empty page and leaves you alone with it.
Where Cozy is better
Your entries are ordinary files, so the journal outlives the app. There's no account and nothing about you on a server of mine. It runs on your Mac or PC too, with a real keyboard for the long entries. And it's paid once.
About AI
Natus is built around it. Cozy has none, on purpose. I wrote up why Cozy doesn't have AI. The short version: I don't want a model reading over my shoulder in the place where I write the most private things I write. Because Cozy's files are plain, you can still hand them to any AI tool you choose. That stays your call.
So which one is for you?
If you want guidance, a reading to start from and an app that talks back, try Natus. Its first reading is free.
If you want a private place to write where nothing reads your entries, and you want them as files you'll still open in twenty years, Cozy is the better fit.
Comparing other apps? Read Cozy vs Day One, Cozy vs Diarium, Cozy vs Journey, or Cozy vs Apple Journal.