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.
a one-sentence diary
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.
coming soon
a one-sentence diaryOnsen
A diary of single sentences, one for each day.
Inside Onsen
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.
TodayOnsen
A diary of single sentences, one for each day.
In useOnsen
A diary of single sentences, one for each day.
Your progressOnsen
A diary of single sentences, one for each day.
Write today's sentence.
Seven days free to start. No account — just a line a day, kept on your phone.