TimeTree, Inc.
Category: AI Agents
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, Spotlight Inc, Atinum Investment, K2 Investment Partners, Mirae Asset Venture Investment, 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, Find/Discover (みつける) event discovery, AI Event Assist / schedule scan (image-to-event), Multi-language voice input for events, Calendar Twin (AI schedule recommendation tech, in development with SKT)
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 engaged user base (75M+ registered users) and 16B+ schedule data points, creating a strong network effect for schedule-centered AI. Partnership with SK Telecom applies A. (A-Dot) Agentic Workflow to TimeTree; proprietary Calendar Twin analyzes behavioral patterns for proactive schedule recommendations.
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 ($14.8M / ¥2.2B investment for AI agent service development, Series F lead), Official media partner of MUSIC AWARDS JAPAN 2026 (second consecutive year), TimeTree AI Technology Award sponsor at Bucheon International Fantastic Film Festival (BIFAN) 2026
Notable customers
Primarily B2C with over 75 million registered users globally (as of June 2026)., Official media partner delivering MUSIC AWARDS JAPAN 2026 event calendars worldwide., Selected as official support app for Hiroshima Prefecture's Shared Housework & Shared Parenting Project (Dec 2025)., Public Calendar platform used across entertainment, business, and government (e.g., V Point official calendar).
Major milestones
Surpassed 75 million registered users worldwide (as of June 2026)., SK Telecom strategic investment ¥2.2B / Series F close ¥1.6B primary + ¥1.6B secondary; cumulative raised ¥6.7B (Sept–Nov 2025)., Launched comprehensive UI/UX redesign with Home Calendar and Find/Discover tab (Jan 2026)., Released AI features including image-to-event scan, multi-language voice input, Event Assist (2025–2026)., Official media partner MUSIC AWARDS JAPAN 2026; presented 2nd TimeTree AI Technology Award at BIFAN (Jun–Jul 2026).
Growth metrics
As of June 2026, TimeTree has surpassed 75 million registered users worldwide (App Store / company PR); 16B+ schedule data points cited mid-2026.
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, planning social communication services. In 2012 he was seconded to Kakao Japan (KakaoTalk), then in 2014 co-founded JUBILEE WORKS Co., Ltd. (renamed TimeTree, Inc.).
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Official website: https://timetreeapp.com/
