Commaday: One Line Journal

A note first: the app's interface is entirely in Korean. There is no English UI yet. If you read Korean comfortably — or you're learning and want the immersion — it works as-is. I'd rather you know before installing. Inside the app you'll see its Korean name, 낙서장씨.

How many journals have you started and left behind?

Commaday is a diary built around one line a day. Too long to write, too imperfect to post, so you put it off — this app starts from the smallest habit instead.

■ One line a day
One sentence is enough. You can attach a photo if you want. On days when nothing comes to mind, a prompt is waiting: 66 sentence prompts and 60 words run on separate cycles, so a given pairing takes nearly two years to come back. You can ignore both and write freely. If you'd like, a quiet reminder arrives each night at a time you choose. You can change it in settings.

■ The comma that keeps you going
Write daily and your streak builds. Every seven days you earn a comma, and you can hold up to two. If you're running low, you can earn one by watching a single ad. Take a day off and a comma fills it in for you. And if a streak does end, every entry you wrote stays exactly where it is — nothing is deleted, and nothing counts down to a next goal.

■ Your time, gathered on a calendar
The days you wrote are joined by a golden thread across the calendar. Look back after a month and the single lines have quietly become a story.

■ Your writing stays on your phone
No account, no sign-up, no server of mine. Everything is stored on your device. An optional Google Drive backup lets you move your entries and photos to a new phone.

■ Premium (optional)
· All 3 ways in one day — Freeform, Sentence, Word
· 3 photos per entry
· Write your own prompts and keep them
· Export as PDF — each month on one calendar cover

A one-time purchase. The free way you've been writing stays exactly as it is.

Tonight, just one line.

Recent changes:
I wanted the moment after you write to stay quiet.

Saving an entry no longer brings up an ad.
Starting over now asks you first, and your earlier entry stays until you save the new one.