Timetree

About Timetree

TimeTree, Inc. develops and operates a calendar-sharing application designed to facilitate schedule management through sharing and communication. Founded in 2014 by Chajin Park and headquartered in Tokyo, Japan, the company was established to address the idea that most plans involve multiple people, yet traditional calendars are built for individual use. The service officially launched on March 24, 2015. The TimeTree application allows users to create and manage multiple shared calendars for various groups such as family, colleagues, and friends. Key features include in-app communication spaces for each event, note-taking, to-do lists, and the ability to share events via social media. This design consolidates personal schedules with group activities, aiming to reduce miscommunication and simplify coordination. The app operates on a freemium model; the core service is free and ad-supported, while a "TimeTree Premium" subscription offers an ad-free experience, the ability to attach files to events, a vertical calendar view, and dedicated support. Since its launch, TimeTree has seen substantial user growth, surpassing 60 million registered users by October 2024 and 70 million by November 2025. The company has successfully raised approximately $57.1 million in capital over several funding rounds, including a Series F round in November 2025. Investors include SK Telecom, Stonebridge Capital, and K2 Investment Partners. In February 2025, TimeTree also acquired Netty. The firm is now expanding into schedule-centered AI, leveraging its database of over 14 billion events to provide context-aware recommendations and actions, a project bolstered by a partnership with SK Telecom.