TimeTree, Inc.
TimeTree is a shared calendar app designed for communication and planning among family, friends, and groups. TimeTree, Inc. was founded in 2014. The company is led by Yasuto Fukagawa. Based in Tokyo, Japan. Team size: 51-200. Total funding raised: $43.7M. Latest round: Series F, $10.41M, 2025-11, led by SK Telecom. Key investors include ["SK Telecom","Kakao Ventures","Persol Venture Partners","Stonebridge Ventures","KB Investment"].
- Founded
- 2014
- Headquarters
- Tokyo, Japan
- Team size
- 51-200
- Total funding
- $43.7M
Value proposition
To simplify scheduling and enhance communication within groups by providing a single, shared calendar that everyone can access and contribute to.
Products and solutions
["TimeTree App (iOS and Android)","Shared Calendars","In-app Chat","Memos and To-do Lists","Web Version","Public Calendars"]
Unique value
TimeTree's uniqueness lies in its focus on the social and communicative aspects of scheduling, rather than just being a personal productivity tool. The ability to have multiple shared calendars for different groups and the integrated chat feature set it apart from other calendar apps.
Target customer
Families, couples, and small groups who need to coordinate schedules and communicate about events. It is also used by individuals for personal planning.
Industries served
["Consumer Technology","Social Networking","AI and Telecommunications (through partnership with SK Telecom)"]
Technology advantage
TimeTree's key advantage is its large and engaged user base (over 50 million users), creating a strong network effect. The company's focus on a simple and intuitive user experience has also contributed to its success. The partnership with SK Telecom will provide a technological advantage in the development of AI-powered services.
How they differentiate
TimeTree differentiates itself by focusing on shared calendars for personal relationships, such as families, couples, and small groups. It integrates communication features like chat and to-do lists directly within calendar events, creating a centralized platform for planning and communication. Unlike more general calendar applications, its features are specifically designed for collaborative scheduling and coordination among small, close-knit groups.
Main competitors
["Google Calendar","Cozi","Teamup"]
Key partnerships
["SK Telecom ($14.8 million investment for AI agent service development)"]
Notable customers
["TimeTree is primarily a B2C application with over 67 million registered users globally.","Selected as official support app for Hiroshima Prefecture's 'Shared Housework & Shared Parenting Project' (Dec 2025).","Public Calendar platform used by organizations across entertainment, business, and government sectors."]
Major milestones
["Reached over 67 million registered users globally (Aug 2024).","Secured a strategic investment of $14.8 million from SK Telecom to develop an AI agent service (Sept 2025).","Raised ¥1.6 billion (~$10.4M) in Series F round (Nov 2025).","Launched comprehensive UI/UX redesign with 'My Time'-centric Home Calendar (Jan 2026).","Established a strong market presence in Japan and other Asian countries."]
Growth metrics
As of August 2024, TimeTree has surpassed 67 million registered users worldwide.
Market positioning
TimeTree is positioned as a 'social calendar' and a 'relationship-focused' scheduling application. It targets users who need to coordinate schedules with others in their personal lives, rather than for professional or enterprise use. The app aims to be an essential tool for improving communication and organization within families and social circles.
Geographic focus
TimeTree is a Japanese company with a significant user base in Asia, particularly in Japan, South Korea, and Taiwan. However, the application is available globally and is expanding its presence in North America and Europe. Its main competitors, like Google Calendar, have a global presence, while others, such as Cozi, are more focused on the North American market.
Patents and IP
No specific public information about patents held by TimeTree was found. However, their developer guidelines state that all intellectual property rights for the platform belong to the company.
About Yasuto Fukagawa
After studying sociology and cultural anthropology at Kyushu University, Fukagawa joined Yahoo Japan Corporation in 2006, where he was in charge of planning social communication services. In 2014, he co-founded JUBILEE WORKS Co., Ltd., which was later renamed TimeTree, Inc.
Official website: https://timetreeapp.com/