Show HN: Hanaco Weather – A poetic weather SNS from the OS Yamato project

hanaco Weather is a minimalist social network where users post short, emotional weather thoughts and connect with others experiencing the same weather.

No likes or followers (for now) — just gentle presence.

Built entirely by a solo engineer, including the custom operating system it runs on: OS Yamato.

What is OS Yamato?

OS Yamato is a poetic, ephemerality-first operating system designed to let digital memories bloom and fade, like flowers in the wind.

Features include:

Diaries that bloom like seasonal flowers — and wither if forgotten

Photos and videos that quietly disappear unless viewed again

Chat with ambient seasonal effects and no pressure

A soft, nature-inspired calendar with reusable schedule templates

Wind Messages — time-delayed letters that arrive months later

A 3D globe to see fleeting connections blossom around the world

Each app within OS Yamato reflects a different way of embracing impermanence in the digital world.

Learn more about the concept and philosophy: [YouTube – Write a diary, and a flower will bloom](https://youtu.be/JrqwU_N5WBA?si=kZQAadNdBGipk6gz)

Try Hanaco Weather now: https://hanaco875.com

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