Japan travel · verification first
Book the onsen you think you’re booking.
“Private bath,” “open-air bath” and “private onsen” are often used loosely. OnsenCheck separates what is attached to your room, what uses real hot-spring water, and what the property actually documents.
Three checks before paying a premium
We only mark a fact as verified when the property or booking provider documents it.
Start with Hakone
Choose a room with the bath you want, or plan a day trip from Tokyo.
Stay overnight
Hakone ryokan with private onsen
10 properties checked against their own official pages. Compare every-room vs selected-room baths, water claims and source-flow statements.
Compare ryokanVisit from Tokyo
Hakone & Mt Fuji day experiences
Day-trip options for travelers who want Hakone without an overnight stay. Compare meeting points, transport arrangements and what to confirm before booking.
Compare experiencesWhat makes this different
No inferred facts
If the official page does not state the bath flow method, we say “not verified” rather than filling the gap.
Room-level distinctions
“Every room” and “selected room types” are materially different booking risks, so we keep them separate.
Commercial links are visible
Affiliate relationships are disclosed near the recommendation context, not buried in a legal page.