TwentySeven
MLB win probability, live on every pitch.
TwentySeven turns every MLB box score into a story. Most scoreboards tell you what happened — TwentySeven tells you why it mattered, through win probability, leverage, and player impact, calculated live on every pitch.
What it does
Live Activities & Dynamic Island
Pin any game to your Lock Screen. Score, inning, runners, outs, and a live win-probability mini-graph update on every pitch — no need to keep the app open.
The story of every game
Open any game to see the win-probability curve, run differential, player impact rankings, and the five highest-leverage plays — the moments that actually decided the game.
The story of the season
Standings, power rankings with heat trends, Monte Carlo playoff odds, schedule strength, Pythagorean over- and under-performers, and the week's must-watch games.
Smart notifications
Pushes only for moments that actually matter: high-leverage spots, late-and-close games, walk-off opportunities, no-hitters in progress. No spam about routine runs.
Built for fans
Free, no ads, no account required. Spoiler hiding for your favorite team. Designed for fans, not advertisers.
Who it's for
Built for baseball fans who care about the why
TwentySeven is for baseball fans who want more than a scoreboard — fans who care about the why behind every pitch. Live win probability, leverage-weighted player impact, and Lock Screen Live Activities make it easy to glance at any moment and understand exactly where the game stands. iOS only, no account required, free with no ads.
Guides
Learn as you play
How win probability works in baseball
6 min →Win probability is the one number that tells you not just the score, but each team’s real, live chance of winning the game — here’s how it’s calculated and how to read it.
What is leverage index in baseball?
6 min →Leverage index turns the vague feeling that “this is a big moment” into a precise number — here’s what it means and why managers plan around it.
What is WPA (Win Probability Added) in baseball?
7 min →Win probability added credits players for the wins they actually create, rewarding a two-out single that decides a game over four empty hits in a blowout.