One Line Diary

What it does

Write a few words each day. AI reflects back the patterns, moods, and moments you'd never notice. Free, private, and beautifully minimal.

One line a day. That's it. A private diary that stays on your iPhone — no account, no AI, no tracking, with optional private iCloud sync. Write a sentence, note your mood, build a streak.

A private diary that stays on your iPhone. Write a sentence about your day, note how you felt, and let the streak grow. Nothing is ever sent to us — because there’s nowhere for it to go. One Line keeps a diary the old-fashioned way: in one place, on paper you hold. Here that paper is your phone — and nothing about it phones home. No email, no sign-up. An anonymous journal lives on your device the moment you start. We run no servers of our own. Your journal stays on your device, or syncs only to your private iCloud if you choose — never to us. Nothing you write is read by a model — ours or anyone else’s. A diary, not a data set. No analytics, no ads, no third-party SDKs, no advertising…from onelinediary.com

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