Mountain Collector is an Android application designed for hiking enthusiasts focused on Japan's top 100 mountains. This free app allows users to track their climbing progress and create personalized collections of their favorite summits. It offers three methods for recording treks: by importing GPX files, using GPS for current location tracking, or manually entering climbing dates through a calendar interface. Users can also access detailed information about each mountain and utilize links to popular climbing resources.

The app includes a unique 'MYLIST' feature that enables users to curate their own collections of mountains based on various themes, such as best autumn views or personal favorites. Additionally, Mountain Collector integrates useful links to weather forecasts and geological information, enhancing the overall climbing experience. With the ability to check trek records on a map and an intuitive user interface, this app is a comprehensive tool for both novice and experienced climbers.