Sleeper

Sleeper (operating at sleeper.app) is a fantasy sports and live sports engagement platform engineered for real-time participation and community-driven competition. Founded in 2015 by Nan Wang, Weixi Yen, and Ken Wang and headquartered in San Francisco, Sleeper redefines fantasy sports by consolidating player picks, team management, and live event tracking into a seamless mobile experience. Unlike traditional fantasy platforms burdened by paywalls or cluttered interfaces, Sleeper streamlines the user journey with ad-free, no-frills functionality—ideal for both casual fans and competitive league managers. Under the hood, the app leverages real-time data feeds, AI-driven player analytics, and a proprietary league-management system to deliver instant scores, standings, and chat integration across NFL, NBA, MLB, NHL, WNBA, and college basketball. This allows fantasy sports enthusiasts to draft teams, make dynamic in-game picks, and collaborate with friends—all without subscription costs or ads. Backed by $67.0M in funding across four rounds, Sleeper has scaled to serve over 13 million active users while maintaining a focus on simplicity and community engagement.