Welcome to Cairn
A 60-second tour of the privacy-first AI micro-journal — what it does, who it's for, and how the iPhone, Apple Watch, and on-device AI work together.
What Cairn is for
Cairn is a journal you speak, not one you type. Raise your Apple Watch, talk for up to thirty seconds, and the entry is done — before a blank page has a chance to intimidate you. Everything else the app does is built on top of those thirty seconds.
What happens to what you say
Your voice is transcribed and analysed on your device by default. Mood, energy and recurring themes are worked out locally; nothing is uploaded unless you deliberately switch on cloud AI, and even then only for the entries you choose.
What to do first
Record one entry today, then another tomorrow. Cairn's weekly and monthly views only become useful once there is something to compare — a single week of entries is enough for the first patterns to appear.