Cairn

A quiet, private journal for iPhone — and a way to find the patterns in your days.

Write a few sentences each day. Cairn’s on-device intelligence quietly reads what you wrote and finds the patterns — your mood, the people who keep showing up, the things you keep returning to. Then, at the end of the week, it reflects the throughline back to you.

Your words never leave your iPhone. No servers. No accounts. No analytics. No ads.

What Cairn does

• ●A beautiful serif writing surface — the kind of paper you want to return to
• ●Mood, people, places, and themes are tagged on-device, automatically
• ●Patterns: see your mood across the last 30 days, the things you wrote about most, your streak
• ●Weekly synthesis (Premium): a single paragraph that reads your week back to you — honest, observant, never therapeutic
• ●Home Screen and Lock Screen widgets, Siri & Shortcuts, daily reminders you control
• ●Export to Markdown any time — your words belong to you

Privacy, as a feature

Most journaling apps quietly send your most intimate writing through a third-party API, store it on someone else’s server, and use it to train a model. Cairn doesn’t. Apple’s Foundation Models framework lets the AI run entirely on your iPhone — fast, free, offline.

Cairn collects no data. Not your name, not analytics, not crash reports tied to you. Nothing leaves your phone unless you turn on iCloud sync — and even then only your encrypted journal moves between your own Apple devices.

Premium

Cairn is free to use. Premium unlocks weekly synthesis, voice journaling, iCloud sync, themes, and the Apple Watch app. Choose monthly, annual (with a 7-day free trial), or a one-time lifetime purchase.

Coming to the App Store

Cairn is in final review. Sign up to be notified when it’s live: Gareth@onliware.ie