katagamistudio

Re:Show HN: Yumo.to, a map of 19,652 onsens in Japan on Sunday March 08, 2026 @11:29PM (#47304569)

Thank you so much, and you are right about the filter. I'm gonna change that asap

Re:Show HN: Yumo.to, a map of 19,652 onsens in Japan on Sunday March 08, 2026 @01:53AM (#47295185)

Thanks! For now you can only filter by tattoo policies (tapping the color circles) or you can also filter by town or prefecture using the search feature

I'm adding more data, it takes a while to ingest and process since there's 19000+ listings. it should be way more complete in the next few days

Re:Show HN: Yumo.to, a map of 19,652 onsens in Japan on Saturday March 07, 2026 @10:54PM (#47294255)

Not white on blue? I'll check why it appears grey!

Re:Show HN: Yumo.to, a map of 19,652 onsens in Japan on Saturday March 07, 2026 @10:29PM (#47294107)

Happy to answer questions about the data pipeline. The hardest part was that there isn’t one clean nationwide onsen database, so I had to merge official national data, local open data, scientific datasets, and community sources, then deduplicate them and keep source attribution on each entry. It's also quite hard to find proper websites for each entries

Show HN: Yumo.to, a map of 19,652 onsens in Japan

Posted by katagamistudio on Saturday March 07, 2026 @10:27PM
from the show-hn dept.

https://yumo.to/

I built Yumo.to because I wanted a map-first way to discover onsens in Japan without digging through booking sites.It currently covers 19,652 onsens across all 47 prefectures, built by merging national datasets, prefecture and municipal open data, OSM, and water-chemistry sources into one searchable map.You can filter by tattoo policy, prices, opening hours, access, and some water data, and...

( Read More... | 7 comments | 2 points | on HN )