The UnderDraft Rulebook
Every sport.
One rulebook.
Official recreational rules for 12 sports — sourced from the governing bodies, adapted for adult rec play, and kept current. The reference for players, captains, and referees.
Browse by sport
Soccer
Basketball
Volleyball
Softball
Baseball
Kickball
Flag Football
Tennis
Pickleball
Cornhole
Golf
BowlingBeyond the baseline
Every league plays it a little differently
Leagues on UnderDraft publish their own rule sets on top of these baselines — co-ed ratios, time limits, mercy rules. Players see exactly what applies before each game, referees enforce it from the sideline, and disputes end with a link instead of an argument.
Organizers publish a rule set
Start from the sport baseline, adjust what your league does differently.
Players see it before every game
The rule set rides with the game — no more “our league does it differently.”
Referees enforce it live
The sideline shows the active rules during play, violations and all.
Put your league's rules to work
Publish a rule set once — UnderDraft carries it into registration, rosters, and the live tracker. Free for organizers.
Start your league free