Your league. Your rules. Your season.
A single-player sports league simulator that turns your daily habits into game-day performance. Name your rivals. Set your tasks. Win your season.
How it works
Three steps. Every day is game day.
Build your roster
Name your rivals, friends, and nemesis. They become AI opponents in your personal league.
Complete your tasks
Your daily habits become game-day performance. Every task earns points toward your matchup score.
Win the season
Climb the standings, make the playoffs, take the championship. Losses are part of the story.
This is not a habit tracker
This is your league.
Opponent matchups with real personality
Face named opponents seeded from your own life. Your nemesis is tough to beat. Your friend gives you a winnable game. Every matchup feels personal.
AI-powered commentary
Two commentators call your games with ESPN energy. A personal Coach delivers insights based on your actual performance data.
Adaptive difficulty that learns
The scoring engine calibrates to your level. Win too much, opponents get tougher. Struggle, and the game adjusts. Target win rate: 57%.
Playoffs and championship runs
Regular season standings determine playoff seeding. Single elimination, best-of-3, or best-of-5 depending on your season length.
Every morning, you face an opponent
Simple pricing
The full game is free. Pro unlocks the long seasons.
- 4-week seasons
- 1 active season
- Weekly Coach insights
- Full AI commentary
- All game features included
- Up to 12-week seasons
- 3 active seasons
- Daily Coach insights
- Priority AI commentary
- Shareable season profiles
- 200 chips/month
- Season recaps & league themes
Built for people who think in parlays
Calculators, definitions, and guides for sports bettors, fantasy players, and competitive minds. Free, no signup, no ads.
Calculators
All tools →Parlay Calculator
Multiply odds across legs. American, decimal, fractional.
Implied Probability
Convert any odds format to true implied probability.
Hedge Calculator
Lock in profit on a live parlay. Equal-profit math.
Vig Remover
Strip the book's margin. See the true probability.
Kelly Criterion
Optimal bet sizing for your bankroll and edge.
Bracket Generator
Single-elimination bracket. 4, 8, or 16 teams.
Sports betting, plain English
Plain-English definitions of the terms you'll see on a sportsbook line, in our calculators, and across the site. Each entry links to the related tool.
Browse all terms →Long-form strategy and math
Pillar pieces on parlays, American odds, hedging, and finding edge. Written for people who want to understand the game, not just gamble it.
Read the guides →
Ready to start
your season?
Duolingo made learning feel like a game.
Parlay makes your whole day feel like game day.