lucy

Solo builder creating haru in Tokyo.

About

Hi, I'm Lucy — a solo builder based in Tokyo. I’m currently building haru, an AI journaling app that reads what you write, remembers it, and responds in a more human way. I’ve always used AI to process my thoughts, but something felt missing — nothing really remembered me. So I started building what I wish existed. Still early, still learning, and sharing the journey as I go.

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Maker History

haruA journal that reads your entries and talks back
Apr 2026

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Joined Product HuntApril 1st, 2026

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2mo ago

haru - A journal that reads your entries and talks back

haru is a diary that doesn't just store your words — it reads them. Write an entry, and haru responds. Not generic advice, but a reflection based on what you wrote. It notices mood patterns and reminds you of similar past moments. Features: - Diary mode or chat with haru in one entry - Mood calendar at a glance - Auto-summary for every entry - haru remembers your story across entries - EN, KO, JA, ZH - Desktop and mobile - 14-day free trial, no card needed