Start playing uCALL for Umpires today - built by and for Major League Umpires.

With over a million pitches to play, you call balls and strikes from the view - or slot - an umpire has behind the plate!

Fun for the fan and useful for the training umpire, this immersive simulation lets you call balls and strikes on real Major League pitchers.

Need to work on 84mph sliders? Do that in Specific Zone Recognition in uCALL.

Need to work on 76mph curveballs low and outside? Do that too in Specific Zone Recognition.

Want to see how much the catcher's framing is affecting your calls? Toggle on/off Catcher Framing and see for yourself.

After paid download, uCALL for Umpires is completely free to play too!

Check out the app preview images and videos to see how fun and easy it is to play uCALL for Umpires.

uCALL for Umpires features:

• Instant feedback on correct and incorrect calls
• Specific Zone Recognition to work outer and inner zones, upper and lower zones
• Change Batter Settings to test yourself when a batter crowds the plate
• Change Pitch Settings to play against lefty and righty pitchers
• Toggle on/off Catcher Framing to see if your calls are affected by the catcher
• Change Batter Position to see lefty and righty batters

Visit if you need help!

Follow us to get news and updates:
Twitter @deCervoProfile

Have fun playing uCALL for Umpires!

What’s New

Version 1.03

-Minor Bug Fixes

Ratings and Reviews

4.3 out of 5
8 Ratings

8 Ratings

bomb042191 ,

Great NEW tool for training umpires

This looks like a great new tool for judging pitches in the zone.

I’ve been looking for a tool to work on pitches low and away. The slot view is pretty good and sometimes the catcher or batter block the view like in real life.

The Specific Zone Recognition gets into catcher framing (on or off) so that’s cool too. Might be cool if I could track my progress.

Having all the pitchers to choose in Whole Zone is really cool though!!

Hefjhhvgdfj113 ,

Not very realistic

It is good for new umpires to see more pitches. It is just very hard to judge where the zone is when animated.

App Privacy

The developer, deCervo, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


deCervo LLC
198 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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