Kiroku - A diary app where AI responds with a single comment

I thought the reason my diary wasn't continuing was because there was too much to write. Kiroku limits input to just one line and a single mood emoji.

When you write one line, AI returns a comment based on that day's content. The calendar gets colored on the days you write, making you feel the continuity. The mood score transitions become a graph, helping you notice changes in your state.

If something comes back even when you just write "I'm tired today" and close it, you'll feel like opening it again. Rather than increasing the amount of records to keep going, I designed it with the idea that the trick to continuing is creating a reason to open it.

Tech stack: Flutter / Firebase (Firestore, Cloud Functions, Auth) / RevenueCat. AI comment generation is done on the Cloud Functions side, and API keys are not exposed to the client.