Daybook AI

Turns your chats into your calendar — and nothing ever leaves your phone.

Daybook AI is a private calendar with a free AI that runs entirely on your device. It reads the plans buried in your messages, turns them into events, tasks and contacts you tap to accept, and answers questions about your day in plain language — with no account, no server, and your data going nowhere.

FOUND FOR YOU — your messages become your schedule "Golf with Zero, Tuesday 3pm" in a chat becomes a one-tap calendar suggestion. An on-device triage drops the junk so you only see what matters — events, tasks and contacts, pulled from the messages you already get.

JUST TALK TO YOUR CALENDAR "Move my dentist to Friday." "What's on next week?" Ask Daybook AI creates, edits and answers in plain language, grounded in your real schedule — no invented dates.

PRIVATE BY ARCHITECTURE, NOT BY PROMISE The AI is a small language model that lives inside the app. Your messages, calendar and contacts are processed on your device and never uploaded. No account, no analytics, no ad or tracking SDKs. It even works in airplane mode. (Prefer a frontier cloud model? Add your own key — the only thing that ever uses the network, sent straight from your phone to your provider.)

WORKS WITH THE CALENDARS YOU ALREADY HAVE Two-way sync with the Google, iCloud, Outlook or local calendars already on your device — read and written in place, nothing to migrate. Uploads stay off by default: Daybook suggests, you decide.

BEAUTIFUL ON EVERY SCREEN See your whole day as a Sun Path arc. Designed for iPhone and iPad — your day, at a glance.

FREE The on-device AI, the calendar, the morning brief and natural-language entry are all free. No account required.