I never kept a diary. Turns out I was already writing one.

Hey everyone! I'm Yuji, a solo full-stack engineer based in Japan.

I have never been able to keep a diary. I've tried paper notebooks, apps, templates. The pattern was always the same: a week of momentum, then silence. The busiest days were always the first ones I stopped writing about.

But I was recording my life all along. My calendar knew where I was. GitHub knew what I shipped. Slack knew who I talked to. The pieces were there, scattered across a dozen services. No one was putting them together.

One day, I fed a day of my activity data into an LLM and asked it to write a diary entry. What came back stopped me.

It was a completely ordinary day. I had merged some pull requests, played a game in the evening, chatted with a friend about nothing in particular. None of it was remarkable. But reading the entry, the whole day came back to me. The shape of it, the rhythm, the small moments between tasks. A friend said something funny before bed. Slack would have buried it in a week. The diary kept it.

That was the moment I knew I had to build this.

deariary connects to Google Calendar, Slack, GitHub, Todoist, Toggl Track, Steam, Bluesky, and more. Every night it collects your activity and writes a diary entry. Every morning you wake up to yesterday, fully written.

You never write a word. You just read, and remember.

Try it free: https://deariary.com

I'd love to hear what you think!