Stuff or Not
A mobile baseball pitch grader
About
Analyze baseball pitch characteristics and their impact on batted ball outcomes. Understand how velocity, movement, and release point influence ground balls, whiffs, and other events. Improve pitching strategy with data-driven insights from millions of collegiate and professional pitches.
What's New in Stuff or Not
1.1
February 21, 2026
Bundled with the latest NCAA and MLB data, and added an 'Update Data' button to allow the user to update to the latest available pitch data.
Developer apps
FAQ
What is Stuff or Not?
Stuff or Not is a mobile application designed to analyze baseball pitch characteristics and predict their outcomes, such as ground balls or whiffs. It uses data from millions of collegiate and professional pitches to provide insights into how pitch variables affect batted ball events.
What kind of data does Stuff or Not use?
The app is built on data from over 5 million Division 1 (D1) college pitches and over 2.2 million Major League Baseball (MLB) pitches from 2022-2025. This extensive dataset allows for robust analysis of pitch performance.
How does Stuff or Not help coaches and players?
It provides easily accessible information about event type outcomes and expected statistics like xAVG and xSLG for different pitches. This helps in understanding how specific pitch types lead to desired outcomes and in refining pitching strategies.
Can Stuff or Not be used during bullpen sessions?
Yes, the app's dashboard screen is particularly useful for adding competition and another dimension of coaching to bullpen sessions. Players can input pitch characteristics and see outcome likelihoods in real-time.
What is the heatmap screen in Stuff or Not?
The heatmap screen allows users to visualize how event type outcomes change with variations in pitch characteristics. It shows how quickly and in what direction outcomes vary as velocity, movement, or release point are adjusted.
What devices does Stuff or Not support?
Stuff or Not is currently supported on iPhone devices. The app was last updated on February 21, 2026, with version 1.1.
Is Stuff or Not free to use?
Yes, Stuff or Not is available for free. It does not have in-app purchases or advertisements, offering a completely free experience for users.
What is the age rating for Stuff or Not?
Stuff or Not has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions.
