The diary I couldn't keep
I have never been able to keep a diary.
Not for lack of trying. I have started and abandoned more journals than I can count. Paper notebooks, apps, templates. The pattern was always the same: a week of momentum, then silence. Life gets busy, and the busiest days are the first ones you stop writing about.
The irony is that 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 data existed, scattered across a dozen services. No one was putting it together.
The prototype that changed everything
I had been building small tools around the GitHub Events API for years, trying to generate monthly summaries of what I had done. They worked, technically. But they always required manual effort, and I would always stop.
Then I tried feeding a day of my activity data from several services 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.
My OSS project had crossed a milestone that day. GitHub shows you the current star count, but it does not tell you when you hit a specific number. The diary noted it. A friend said something funny before bed. Slack would have buried it in a week. The diary kept it.
I thought: a year from now, I will remember this day. Without the diary, I would not. And that was the difference I had been looking for.
LLMs don’t invent your diary. They translate it.
People often assume that AI-generated text is fabricated. In many contexts, that is a fair concern. But what deariary does is fundamentally different.
Your day already happened. The events are real, the timestamps are real, the conversations are real. The LLM is not inventing a story. It is taking structured data from multiple sources and translating it into prose. Summarization and translation, not generation in the creative sense.
This distinction matters. It is why the output feels right rather than uncanny. The model is not imagining your life. It is describing what already occurred, in a form that is easy to read and easy to look back on.
A gift to your future self
I built deariary because I believe recording your life should not require discipline. The tools you use every day already capture the pieces. The only missing step is assembling them into something readable.
That step should be automatic. Not because writing is unimportant, but because the alternative is that most days simply vanish. Your fullest, most lived-in days disappear first, because you were too busy living them to write anything down.
deariary is a quiet machine that runs in the background and leaves a gift for your future self every morning. No habits to build. No streaks to maintain. Just a record that accumulates while you live your life.
If you have ever wanted a diary but couldn’t keep one, this is for you.
