FanStar is an online league management platform for fantasy sports commissioners and team owners. Serving fantasy leagues since 1993, the company offers software to set up and run fantasy football, baseball, and NASCAR leagues. Its football platform supports leagues of up to 48 teams across four conferences, with standard or customizable scoring, live scoring, flexible standings, and several league formats, including traditional, draft master, best ball, and one-and-done play.

Commissioners can customize league rules, schedules, playoffs, layouts, colors, and logos, and manage player movement through options such as blind bidding and first-come, first-served waivers. Tools for research include player rankings, projections, depth charts, injury reports, and points analysis. Social and communication features include live chat, message boards, league news, photo galleries, and email or text updates, alongside a companion mobile app. FanStar also provides commissioner controls for trades, discretionary points, and league content. The service offers a free trial, allowing commissioners to explore its features before setting up a league.