One sentence, one day
Each day holds a single sentence, up to 180 characters. The constraint is the point: small enough to keep, honest enough to matter.
Onsen
A diary of single sentences, one for each day.
Onsen asks for one sentence about today, then gets out of the way. In a year this month will read like a place you have been. In ten it will read like a lifetime.
A month you can read at a glance
Days fill a calm grid as you write. Swipe across months, pinch out to a year, and land on any day you have kept.
A quiet sticker, if you want one
Mark a day with one small hand-drawn sticker. No streaks, no scores, no guilt — the diary never asks for more than a sentence.
Yours, on your device
Sentences live on your phone, never on our servers. Lock the diary with Face ID, export it as plain text whenever you like.
Write today's sentence.
Seven days free to start. No account — just a line a day, kept on your phone.