One-Line Diary - AI Journal

마이너스베타스튜디오

Contains adsIn-app purchases

About this app

One line a day is enough.

Some days you want to wrap up the day but have no room to write something long. One-Line Diary is a very small diary for exactly that. Leave today in a single sentence, and AI sends back a warm reply that matches how you feel.

A good fit if you
• want to record your day but find a long diary a burden
• have feelings you cannot tell anyone and want somewhere to put them
• wish there were an app that says one warm thing to you
• are tired of signing up — you just want to write quietly

Main features
📝 One-line diary — once a day, within 100 characters. No pressure.
💌 A warm AI reply — it reads the emotional grain of your entry and offers one sentence of encouragement and empathy.
🌙 Streak — one each day, today's trace quietly stacking up.
📅 Year heatmap — a year of entries at a glance. Look back on past days kindly.
🔒 Privacy first — no account, no login. Diary content is stored only on your own device.

How your data is handled (full transparency)
Diary content is stored permanently only inside your device. To generate the AI reply, the diary text is sent temporarily through a Cloudflare Workers proxy to OpenAI (GPT-4o-mini), and the proxy does not store the content. We do not collect personal information such as name or email. The app contains ads, so some data such as advertising identifiers may be processed while ads are served; you can remove ads with an in-app purchase.

Details: https://ssamssae.github.io/daejong-page/privacy-hanjul.html

Who made it
A side project by Kang Daejong, a solo app developer. Built with Flutter, Cloudflare Workers, and the OpenAI API.

Contact: [e-mail]

What’s new

The iPhone app now requires iOS 15 or later.
Purchase restore now restores from the store right away.
Stats are cleaner, and the year recap shows writing days.
Home and the bottom bar have a new layout.