ROSTER MANAGER
This is the source-of-truth machine behind GM. Import, maintain, and organize the team data that powers draft review, trade decisions, and in-season analysis.
One roster source. Multiple GM machines.
Bring supported provider roster data into OWB instead of rebuilding every team manually.
Group rosters by league and keep player composition current.
Use the same roster source in Draft Analyzer, Trade Analyzer and In-Season.
Maintain multiple fantasy teams and sports from one headquarters.
MY ROSTERS
Import, identify and maintain the teams GM should treat as yours.
You can preview a public Sleeper league and inspect its rosters without an account. Sign in only when you want OWB to save a roster as yours, upload a private roster file, or reuse team data across GM tools.
SEE THE IMPORT BEFORE YOU COMMIT
Sleeper league data is preview-only in guest mode. OWB does not create a roster record, mark a team as yours, or attach the league to an identity until you sign in.