Umpire Assistant is a pitch count and score tracker for baseball, softball and kickball officials working from an Android phone. It costs nothing, shows no ads and is built by Robert Hak. This page covers version 1.1.0, updated on October 4, 2026, which runs on Android 8.0 or newer.
Volume buttons that count pitches without a glance
The feature that defines this app is the volume button assignment. You can map the phone's volume keys to pitch counting, so you can log calls while watching the field instead of the screen. For an official standing behind a plate or on the bases, that matters more than any extra screen.
The app is open source under the Apache-2.0 license, and the code is on GitHub at adiamas/umpireassistant. It is a small 1.9 MB package.
How a game runs from first pitch to final score
Before the game you pick or build a saved configuration. Several can be stored for different rule sets, such as a rec league or a tournament. Teams can be named and color coded per configuration, and foul rules can be set so fouls count as strikes, use a strike cap, produce foul outs, are tracked only, or are switched off.
During play you log balls, strikes, fouls and outs. Walks, strikeouts and inning changes advance on their own. The inning tracker shows the top and bottom half, and a batting team indicator sits beside the home and away scores. A game clock can be configured with an alert when time expires.
If a tap lands wrong, undo and redo fix it. A large button layout is available for one-handed use. When the game ends, the final score can be shared through any app on the device.
Where it sits next to the listed alternatives
Alternatives include AAT Another Activity Tracker, Dart Checker, DiveFrame, Suspension Setup and ESPN Fantasy Sports. They cover other activities or fantasy play rather than officiating.
Umpire Assistant is narrow in scope. It targets three sports, and the developer says it needs no internet connection and does no tracking.
Umpire Assistant pros and cons
Pros
- Volume button assignments allow pitch counting without looking at the screen
- Saved configurations cover different rule sets such as rec league and tournament
- Flexible foul rules include strike cap, foul outs and track-only
- Undo and redo guard against accidental taps
- Free, no ads, open source under Apache-2.0, and only 1.9 MB
Cons
- Limited to baseball, softball and kickball officiating
- Requires Android 8.0 or newer
- Version 1.1.0 is the current release, and the app has no Google Play rating yet
Is Umpire Assistant safe?
The APK we store is unmodified, and you can check it against this SHA-256 checksum: febf8998399e3aa7497043e7cacd8e8ab2dfe6ccb50d9a6c3ebad01eadabcb97. The code is public under the Apache-2.0 license at https://github.com/adiamas/umpireassistant, so anyone can read what the app does. The app carries no ads. We have not seen an independent security review of it.
How to install Umpire Assistant
- Download the APK with the button on this page and wait for it to finish.
- Compare the file with the SHA-256 checksum shown here if you want to confirm it arrived intact.
- Open the file on your phone and allow installs from this source when Android asks.
- Finish the install, then open Umpire Assistant from your app drawer.
