OnsenDiary: Onsen & Bath Log
Your private hot-spring log
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
A hot-spring diary with a Spring Guide — collect Japan's nine therapeutic spring qualities by soaking in each one. Log every onsen with one photo, fully offline.
OnsenDiary is a hot-spring collection app built around a Spring Guide — an encyclopedia of the nine therapeutic spring qualities of Japan. It is not just a logger: you learn about each spring quality and collect them as you go.
- Spring Guide (the highlight): Simple, Chloride, Bicarbonate, Sulfate, Carbon dioxide, Iron, Sulfur, Acidic and Radioactive springs. Each entry has its traditional nickname ("the Bath of Beauty", "the Bath of Heat"), the character of the water, what it is traditionally known for, and a bathing tip. Actually soak in a spring quality to unlock its entry — aim to complete all nine.
- Register a spot with one photo; the address is suggested from your current location, fully on-device.
- Log each visit with spring-quality tags, a water-temperature note and a 5-star rating; earn visit and collection badges.
- Personal stats and calendar: weekly bar chart, onsen ranking and a monthly calendar.
- Private by design: no account, no login, no cloud.
Note: the Spring Guide is general cultural information about traditional onsen, not medical advice.
Perfect for onsen lovers, sento fans and travelers in Japan.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
The developer, Yuki Okawa, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Yuki Okawa
- Size
- 25.6 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © Yutech