---
title: "b4-app: AI Batting Partner - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "Revolutionize your baseball training experience. Enhance your batting skills, analyze your performance, and take your game to the next level. Get cutting-edge batting stats, biomechanics analysis, and"
---

# b4-app: AI Batting Partner — United States
> EV, LA, and Biomechanics

![B4-app App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/d4/8a/26/d48a261a-0509-3982-c488-3ae8c4e1669f/AppIcon-0-0-1x_U007ephone-0-1-0-85-220.png/434x0w.png)

**Developer:** [Keep Tossing Lab](https://apptail.io/developer/keep-tossing-lab-IKL)
**Category:** Sports
**Rating:** 4.3/5 (151 ratings)
**Price:** Free
**Bundle ID:** com.KTL.b4
**Store:** Apple App Store
**Country:** United States
**Version:** 3.0.0 (released 2026-10-09)
**Original Release:** 2023-11-02
**Languages:** Chinese, English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id1612791859)
**AppTail Page:** [https://apptail.io/app/b4-app-ai-batting-partner-qvko/united-states](https://apptail.io/app/b4-app-ai-batting-partner-qvko/united-states)

## B4-app Description
Revolutionize your baseball training experience. Enhance your batting skills, analyze your performance, and take your game to the next level. Get cutting-edge batting stats, biomechanics analysis, and real-time feedback—all with just an iPhone and a tripod!
Developed with multiple Major League players.


Key Features 
• Comprehensive Metrics: Access a complete baseball swing analysis toolset, including exit velocity, launch angle, bat path, and biomechanics analysis, to refine your skills and elevate your game.
• Bat Contact Point (BCP): Precisely tracks where the bat hits the ball, giving players actionable insights on every swing.
• Real-Time Playback: Review and learn from past performances with slow-motion videos, and track your progress with real-time analytics.
• Immersive Pitch: An innovative feature that simulates live incoming pitches, refining your timing and reaction down to the millisecond—all from your iPhone.
• Dynamic Visualizations: Easily track progress and identify your strengths.
• AI Report: Gain deeper insight into your hitting performance. Track SwSp%, xwOBA, exit velocity, launch angle, and more.


Batting Statistics Overview
• Bat Contact Point Analysis: Your contact point range with minimum, maximum, and distribution to understand patterns and improve consistency session by session.
• Bat Path Visualization: Gain in-depth insights into your bat control and make informed adjustments.
• Exit Velocity Tracking: Accurately measure the speed of your hits to monitor your progress and aim for new personal bests. 
• Launch Angle Optimization: Perfect your launch angles for maximum performance and increase hitting probability. 
• Comprehensive Biomechanics Analysis: Refine your technique by understanding your stride, weight shift, and head movement. 
• Advanced AI Report: Track hit classifications, analyze SwSp%, xBA, xwOBA, ground-ball to fly-ball ratio, and more to pinpoint and boost your game performance.


Subscriptions
Our app is free for everyone to use! Access lab-level swing analysis at no cost.
The Starter plan lets you analyze up to 30 swings per month. Upgrade anytime for more power!

Starter Pass (Free)
• 30 swings per month
• Perfect for casual swing analysis and quick check-ins

Essential
• 100 swings per month
• More reps, deeper insights, and faster improvement

Premium
• Unlimited swings per month
• Built for dedicated athletes committed to real progress


Choose Your Plan
Essential
• $39.99 / Yearly — Save with our annual subscription
• $3.99 / Monthly — Flexible monthly subscription

Premium
• $149.99 / Yearly — Save with our annual subscription
• $14.99 / Monthly — Flexible monthly subscription

Coach Access+
• Explore enhanced plans designed specifically for coaches at all levels.


Experience Future Tech Today! Dive into advanced batting metrics, enhance your sports performance in real-time, and start your science-backed journey to improvement with the b4-app – all at your fingertips.

## B4-app Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/57/1b/02/571b02e2-4e72-59c6-f641-236d889d65ae/01.jpg/1284x2778.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/e1/3e/2e/e13e2ea3-f033-0cb9-795d-d402a02c99d9/02.jpg/1284x2778.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/f5/8f/0f/f58f0f19-bea5-4dd0-abc3-79daff40660b/03.jpg/1284x2778.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/df/b9/16/dfb916fe-11ab-c5d5-532f-fcd7def17552/04.jpg/1284x2778.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/1e/56/6c/1e566c05-c550-4552-9c08-57e3a32b7be2/05.jpg/1284x2778.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/e8/73/87/e87387db-132c-a4b0-3628-5301558b2b29/06.jpg/1284x2778.png)
- [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/e3/63/8b/e3638bfc-1a02-3555-1551-d73d8ed9edeb/07.jpg/1284x2778.png)

## B4-app Rating Breakdown in United States
- 5 stars: 107 (71%)
- 4 stars: 15 (10%)
- 3 stars: 6 (4%)
- 2 stars: 5 (3%)
- 1 stars: 18 (12%)

## B4-app Reviews in United States

### *---- "Exit velocity"
At first I thought it was good but it started to not track the velo anymore it’ll detect the first one but the next 13 nothing just the launch angle
-- javier aj, 2024-11-15

### ***** "Wow!"
Super simple and powerful!
-- Ryder Lankford, 2024-10-30

### ****- "Play it! It is fun!"
This timing part is so good it and it helps a lot.
-- LundyLynellk, 2024-10-30

### ***** "I love this app"
The best app for batters!
-- winstead_concepciona, 2024-10-29

### ***** "What a great app"
Easy to use!
-- Ludivina_Amadax, 2024-10-28

### ***** "Amazing!"
A perfect tool
-- stidham_evelinas, 2024-10-28

### *---- "Inaccurate Readings"
I reached out via email to “b4” and didn’t receive a reply on how to resolve my issues. It has been over a week now with no response. I contacted them through their support link on the app.

I have tried baseballs and softballs. I have tried lower pitching and higher pitching. I have switched batters. I have double and triple checked the setup and measurements. Nothing I have tried has lead to accurate Exit Velocity (EV). We’re hitting balls over 300’ fences and  the highest EV reading we get is less than 65. 

I canceled the premium plan today. I’m seeing better readings on the reels than we get and I feel like I’ve put more effort into figuring this out than most would.
-- JustGeaux, 2024-10-13

### ***** "Excellent teaching tool"
Exit Velo seems close enough, launch angle right on point. Great tool for seeing mechanics of head tilt, center mass, and stride. Will def use for lessons and individual hitting coaching.
-- MacM630, 2024-10-11

### **--- "Good but bad"
It seems like it works for certain people and i don’t know the conditions it’s supposed to work at but the ev seems incredibly off.
-- smellyshartfart, 2024-09-11

### ***** "Great app"
So awesome! Using this with me and my 8u. Wish there was a distance tracker though!
-- CZCOLLINS, 2024-09-09

[View all B4-app reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)

## B4-app In-App Purchases
| Item | Price |
|------|-------|
| Premium Plan | $149.99 |


## B4-app Discovered Keywords
- b4-app

## Apps Similar to B4-app
- [EasyScore](https://apptail.io/app/easyscore-Zasb/united-states)
- [SwingPerfect](https://apptail.io/app/swingperfect-arbc/united-states)
- [Strike 智慧棒球](https://apptail.io/app/strike-NPce/united-states)
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- [ScoreLive Baseball](https://apptail.io/app/scorelive-baseball-fTGh/united-states)
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## B4-app Available In
- [United States](https://apptail.io/app/b4-app-ai-batting-partner-qvko/united-states)
- [Taiwan](https://apptail.io/app/b4-app-ai-batting-partner-qvko/taiwan)
- [Canada](https://apptail.io/app/b4-app-ai-batting-partner-qvko/canada)
- [Mexico](https://apptail.io/app/b4-app-ai-batting-partner-qvko/mexico)
- [Venezuela](https://apptail.io/app/b4-app-ai-batting-partner-qvko/venezuela)
- [Australia](https://apptail.io/app/b4-app-ai-batting-partner-qvko/australia)
- [Azerbaijan](https://apptail.io/app/b4-app-ai-batting-partner-qvko/azerbaijan)
- [Belgium](https://apptail.io/app/b4-app-ai-batting-partner-qvko/belgium)
- [Bulgaria](https://apptail.io/app/b4-app-ai-batting-partner-qvko/bulgaria)
- [Brunei](https://apptail.io/app/b4-app-ai-batting-partner-qvko/brunei)
- [Brazil](https://apptail.io/app/b4-app-ai-batting-partner-qvko/brazil)
- [Belarus](https://apptail.io/app/b4-app-ai-batting-partner-qvko/belarus)
- [Switzerland](https://apptail.io/app/b4-app-ai-batting-partner-qvko/switzerland)
- [Chile](https://apptail.io/app/b4-app-ai-batting-partner-qvko/chile)
- [China](https://apptail.io/app/b4-app-ai-batting-partner-qvko/china)
- [Colombia](https://apptail.io/app/b4-app-ai-batting-partner-qvko/colombia)
- [Czechia](https://apptail.io/app/b4-app-ai-batting-partner-qvko/czechia)
- [Germany](https://apptail.io/app/b4-app-ai-batting-partner-qvko/germany)
- [Denmark](https://apptail.io/app/b4-app-ai-batting-partner-qvko/denmark)
- [Dominican Republic](https://apptail.io/app/b4-app-ai-batting-partner-qvko/dominican-republic)
- [Algeria](https://apptail.io/app/b4-app-ai-batting-partner-qvko/algeria)
- [Ecuador](https://apptail.io/app/b4-app-ai-batting-partner-qvko/ecuador)
- [Egypt](https://apptail.io/app/b4-app-ai-batting-partner-qvko/egypt)
- [Spain](https://apptail.io/app/b4-app-ai-batting-partner-qvko/spain)
- [Finland](https://apptail.io/app/b4-app-ai-batting-partner-qvko/finland)
- [France](https://apptail.io/app/b4-app-ai-batting-partner-qvko/france)
- [United Kingdom](https://apptail.io/app/b4-app-ai-batting-partner-qvko/united-kingdom)
- [Greece](https://apptail.io/app/b4-app-ai-batting-partner-qvko/greece)
- [Hong Kong SAR China](https://apptail.io/app/b4-app-ai-batting-partner-qvko/hong-kong)
- [Honduras](https://apptail.io/app/b4-app-ai-batting-partner-qvko/honduras)
- [Hungary](https://apptail.io/app/b4-app-ai-batting-partner-qvko/hungary)
- [Indonesia](https://apptail.io/app/b4-app-ai-batting-partner-qvko/indonesia)
- [Ireland](https://apptail.io/app/b4-app-ai-batting-partner-qvko/ireland)
- [Israel](https://apptail.io/app/b4-app-ai-batting-partner-qvko/israel)
- [India](https://apptail.io/app/b4-app-ai-batting-partner-qvko/india)
- [Italy](https://apptail.io/app/b4-app-ai-batting-partner-qvko/italy)
- [Japan](https://apptail.io/app/b4-app-ai-batting-partner-qvko/japan)
- [South Korea](https://apptail.io/app/b4-app-ai-batting-partner-qvko/south-korea)
- [Kuwait](https://apptail.io/app/b4-app-ai-batting-partner-qvko/kuwait)
- [Kazakhstan](https://apptail.io/app/b4-app-ai-batting-partner-qvko/kazakhstan)
- [Lebanon](https://apptail.io/app/b4-app-ai-batting-partner-qvko/lebanon)
- [Lithuania](https://apptail.io/app/b4-app-ai-batting-partner-qvko/lithuania)
- [Madagascar](https://apptail.io/app/b4-app-ai-batting-partner-qvko/madagascar)
- [Macao SAR China](https://apptail.io/app/b4-app-ai-batting-partner-qvko/macau)
- [Malaysia](https://apptail.io/app/b4-app-ai-batting-partner-qvko/malaysia)
- [Nigeria](https://apptail.io/app/b4-app-ai-batting-partner-qvko/nigeria)
- [Nicaragua](https://apptail.io/app/b4-app-ai-batting-partner-qvko/nicaragua)
- [Netherlands](https://apptail.io/app/b4-app-ai-batting-partner-qvko/netherlands)
- [Norway](https://apptail.io/app/b4-app-ai-batting-partner-qvko/norway)
- [Nepal](https://apptail.io/app/b4-app-ai-batting-partner-qvko/nepal)
- [New Zealand](https://apptail.io/app/b4-app-ai-batting-partner-qvko/new-zealand)
- [Panama](https://apptail.io/app/b4-app-ai-batting-partner-qvko/panama)
- [Peru](https://apptail.io/app/b4-app-ai-batting-partner-qvko/peru)
- [Philippines](https://apptail.io/app/b4-app-ai-batting-partner-qvko/philippines)
- [Pakistan](https://apptail.io/app/b4-app-ai-batting-partner-qvko/pakistan)
- [Poland](https://apptail.io/app/b4-app-ai-batting-partner-qvko/poland)
- [Portugal](https://apptail.io/app/b4-app-ai-batting-partner-qvko/portugal)
- [Paraguay](https://apptail.io/app/b4-app-ai-batting-partner-qvko/paraguay)
- [Romania](https://apptail.io/app/b4-app-ai-batting-partner-qvko/romania)
- [Russia](https://apptail.io/app/b4-app-ai-batting-partner-qvko/russia)
- [Saudi Arabia](https://apptail.io/app/b4-app-ai-batting-partner-qvko/saudi-arabia)
- [Sweden](https://apptail.io/app/b4-app-ai-batting-partner-qvko/sweden)
- [Singapore](https://apptail.io/app/b4-app-ai-batting-partner-qvko/singapore)
- [Slovakia](https://apptail.io/app/b4-app-ai-batting-partner-qvko/slovakia)
- [El Salvador](https://apptail.io/app/b4-app-ai-batting-partner-qvko/el-salvador)
- [Thailand](https://apptail.io/app/b4-app-ai-batting-partner-qvko/thailand)
- [Tunisia](https://apptail.io/app/b4-app-ai-batting-partner-qvko/tunisia)
- [Türkiye](https://apptail.io/app/b4-app-ai-batting-partner-qvko/turkey)
- [Ukraine](https://apptail.io/app/b4-app-ai-batting-partner-qvko/ukraine)
- [Uzbekistan](https://apptail.io/app/b4-app-ai-batting-partner-qvko/uzbekistan)
- [British Virgin Islands](https://apptail.io/app/b4-app-ai-batting-partner-qvko/british-virgin-islands)
- [Vietnam](https://apptail.io/app/b4-app-ai-batting-partner-qvko/vietnam)
- [United Arab Emirates](https://apptail.io/app/b4-app-ai-batting-partner-qvko/united-arab-emirates)
- [South Africa](https://apptail.io/app/b4-app-ai-batting-partner-qvko/south-africa)
- [Armenia](https://apptail.io/app/b4-app-ai-batting-partner-qvko/armenia)
- [Angola](https://apptail.io/app/b4-app-ai-batting-partner-qvko/angola)
- [Argentina](https://apptail.io/app/b4-app-ai-batting-partner-qvko/argentina)
- [Austria](https://apptail.io/app/b4-app-ai-batting-partner-qvko/austria)

---

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