テニスベア (TennisBear) is a free lifestyle app developed by Hiroyuki Mashihara, designed to support tennis players in Japan. The app provides real-time information about the availability of public and private tennis courts in the Kanto and Kansai regions, as well as in major cities across the country such as Sapporo, Sendai, Nagoya, Hiroshima, and Fukuoka. With over 3,000 courts listed, TennisBear is the ultimate app for tennis enthusiasts looking to find the perfect court for their game.

The app also offers a variety of features to help players connect with each other and participate in tennis events. TennisBear allows users to join tennis events and practices with like-minded players, from beginner to advanced levels. Additionally, the app provides a comprehensive list of grass-root tournaments across the country, making it easy for players to find and participate in tennis competitions that match their skill levels. Lastly, TennisBear offers a circle feature, allowing players to easily manage and coordinate with their friends and teammates for matches and practices. With its intuitive design and easy-to-use features, TennisBear is a must-have app for tennis players in Japan.