# b4-app: AI Batting Partner

> EV, LA, and Biomechanics

Canonical page: [https://chrome-stats.com/d/id1612791859](https://chrome-stats.com/d/id1612791859)

## Overview

- **ID:** `id1612791859`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** KeepTossingLab
- **Category:** Sports
- **Rating:** 4.20 / 5 (151 ratings)
- **Version:** 2.11.0
- **Last updated:** 2026-09-10
- **First published:** 2023-11-02
- **Size:** 311 MB
- **Data as of:** 2026-09-14
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/b4-app-ai-batting-partner/id1612791859)
- **Privacy policy:** [https://www.b4-app.com/privacy](https://www.b4-app.com/privacy)

## Description

Introducing the b4-app: AI Batting Partner—the first AI-based baseball batting app that delivers instant advanced hitting data on iPhone 11 and later. It provides real-time biomechanics analysis, exit velocity, launch angle, bat path, and Bat Contact Point, with dynamic visualizations and slow-motion playback to refine every swing.

Developed with multiple Major League players, the app includes immersive pitch simulations, AI-generated reports, and a tiered subscription model (Starter Free, Essential, Premium, and Coach Access+). It’s designed for players and coaches seeking data-driven progress, accessible on iPhone with no extra hardware beyond a tripod.

## Rankings

- #120,429 — Overall

## Review summary

Users praise b4-app as a strong coaching and at-home swing analysis tool that provides real-time feedback and metrics like exit velocity, launch angle, and bat path. It's valued for coaching versatility, portable setup, and progress tracking. However, widespread concerns about reliability and accuracy persist: readings can be inconsistent or missing, with velocity numbers sometimes off; the app can crash or stop reading; sign-in issues and older iPhone compatibility also surface, along with pricing and a wish for deeper analytics. Overall, very useful but demand improvement in reliability and access.

### Pros

- Real-time feedback and clear swing analysis with metrics like exit velocity, launch angle, and bat path tracing.
- A valuable coaching tool for players of varying ages and skill levels, helping distinguish good vs. bad swing.
- Easy at-home training setup using just a smartphone and tripod.
- Helpful for tracking progress over time and keeping players motivated.
- Responsive support that helps resolve issues quickly.

### Cons

- Readings can be inconsistent or missing, and velocity measurements can be off (roughly ±15%).
- Reliability issues: crashes or the app stopping readings during use.
- Sign-in/login problems blocking access or sign-up failures.
- Compatibility limitations with older iPhone models.
- Pricing concerns and requests for deeper analytics/features.

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Source: [Chrome-Stats](https://chrome-stats.com/d/id1612791859)