About

We're Building the
Transparent Strike Zone

Baseball's strike zone should be transparent. ump.bot uses AI to analyze every pitch, grade every umpire, and give fans the truth about ball-strike calls — after every game.

Mission

Every Call Accountable

Umpires have one of the hardest jobs in sports. They're asked to make split-second judgments on pitches moving at 95+ mph — calls that can decide pennant races and World Series titles.

We don't think umpires are the enemy. We think opacity is the enemy. When a pitch is called wrong and there's no public accounting for it, that erodes trust in the game. ump.bot changes that.

We use the same pitch-tracking methodology as MLB's Automated Ball-Strike system — personalized strike zones based on each batter's height — to score every umpire after every game. The data is public. The grades are real. The transparency is the point.

94%
MLB umpire accuracy average
~14
Missed calls per game
2,430
MLB games per season
0
Public umpire scorecards (before ump.bot)

How It Works

From Pitch to Scorecard

Three steps. Post-game. Every game.

1

We Ingest Pitch Tracking Data from Every MLB Game

After each game concludes, we pull pitch-tracking data — pitch location in three-dimensional space, velocity, movement, and pitch type. This data is typically available within an hour of the final out.

2

Our AI Compares Each Pitch to the Batter's Personalized Strike Zone

Each batter has a unique strike zone based on their height. The zone top is set at 53.5% of the batter's height; the bottom at 27%. The zone is 17 inches wide — the width of home plate — and evaluated at the front of the plate's midpoint. We compare every pitch location to this zone and determine the correct call.

3

We Publish Post-Game Scorecards, Grades, and Analysis

After each game, ump.bot publishes a full scorecard for every home plate umpire: overall accuracy, called strikes vs. called balls accuracy, run impact of missed calls, historical comparison, and a pitch-by-pitch log of every missed call with zone diagrams.

Roadmap

What's Coming

We're building the most comprehensive umpire analysis platform in baseball.

Launching March 25
Post-Game Scorecards
Next-day umpire accuracy grades published after each game concludes.
Launching March 25
Post-Game Reports
Full breakdown of every called pitch with zone diagrams for each missed call.
Coming Soon
Historical Database
Every umpire, every game, going back years. Search, compare, and analyze trends.
Coming Soon
Pre-Game Predictions
Know your umpire before the first pitch. Historical accuracy, tendencies, and run impact.
Later This Season
ump.bot API
Developers can access our umpire grading data via API. Build umpire analysis into your own apps.
Later This Season
Weekly Newsletter
The week's most egregious missed calls, best umpire performances, and analysis in your inbox.

Contact

Get in Touch

Media inquiries, partnership requests, data questions, or just want to talk baseball?

hello@ump.bot