---
title: "Diamond Trainer AI - Reviews, Revenue and Downloads in Hong Kong SAR China | Apple App Store"
description: "Diamond Trainer turns any iPhone or iPad into a personal baseball & softball performance lab. Record a swing or pitch, and let advanced on‑device vision models break down your movement—frame by frame—"
---

# Diamond Trainer AI — Hong Kong SAR China

![Diamond Trainer AI App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/f0/54/e7/f054e71a-1e14-dfcc-20d5-6a5ad2eede51/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png)

**Developer:** [corey hoggard](https://apptail.io/developer/corey-hoggard-JaW) (United States)
**Category:** Sports
**Rating:** N/A (0 ratings)
**Price:** Free
**Bundle ID:** F4Z2GHLAX2.DiamondTrainer
**Store:** Apple App Store
**Country:** Hong Kong SAR China
**Version:** 1.0 (released 2025-09-21)
**Original Release:** 2025-09-21
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/hk/app/app/id6751373130)
**AppTail Page:** [https://apptail.io/app/diamond-trainer-ai-ntHx/hong-kong](https://apptail.io/app/diamond-trainer-ai-ntHx/hong-kong)

## Diamond Trainer AI Description
Diamond Trainer turns any iPhone or iPad into a personal baseball & softball performance lab. Record a swing or pitch, and let advanced on‑device vision models break down your movement—frame by frame—into the metrics college and pro coaches watch.

Why Athletes & Coaches Love It

Instant clarity: No guessing. Get objective “Efficiency” scores for torso, hips, hands/arms and total sequencing.
Actionable coaching: Each session produces strengths, top opportunities, and targeted drill recommendations.
Pitching or hitting: Switch modes to get discipline‑specific metrics and cues.
Fast & automatic: The app intelligently trims dead time, finds the key motion window, and detects dominant side.
Privacy first: Processing happens on device—your clips don’t need to leave your phone.

Key Metrics (Examples)

Hitting:

Hip–Shoulder Separation (Sequencing “stretch”)
Kinematic Timing (Hands After Hips)
Bat Lag Proxy Angle
Swing Plane Variance
Stance Width Stability
Head Stability (Vertical & Lateral)

Pitching:

Stride Length Ratio (normalized)
Lead Foot Stability Near Release
Arm Slot at Release
Elbow Flexion at MER (Maximum External Rotation)
Hip–Shoulder Separation
Trunk Tilt at Release
Head Stability

Shared Timing Events:

Foot Plant
MER (Maximum External Rotation)
Contact / Release (Wrist Peak Event)
Smart Efficiency Scoring

Diamond Trainer goes beyond “one number.” Subsystem scores (Hands, Hips, Arms, Torso) roll up into an Overall Efficiency score—adaptive to experience level—while factoring data quality so low-confidence clips don’t unfairly punish you.

Personalized Drill Engine

Each improvement item can unlock a recommended drill (e.g., “Hands-After-Hips Tee Progression” or “Stride Box Drill”), with level‑specific hints (T-Ball → Professional) to keep development age‑appropriate and focused.

Data Quality Aware

The app detects when:

Athlete is too small in frame
Lighting or framing reduces pose confidence
Frame rate is insufficient around the action
You’ll see gentle guidance instead of random low scores.

Simple Workflow

Record (or import) a clip
Select Hitting or Pitching
Let analysis run (fast, on-device)
Review Efficiency & Subsystem scores
Read strengths + top opportunities
Add recommended drills to your training plan
Re-test and track progress over time

Designed For

Youth & High School Players seeking structured improvement
Collegiate & Travel Program Coaches scaling feedback
Private Instructors wanting objective baselines
Dedicated athletes tracking off‑season gains

Privacy & Performance

All biomechanical processing uses Apple’s Vision frameworks locally. No account required to start. No external upload needed for core analysis.

EULA - 

## Diamond Trainer AI Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/3b/97/dd/3b97dd28-9097-e8ee-3a4b-d7471be5236c/IMG_0799.png/1242x2688.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/50/7c/ef/507cefab-7c44-299f-5af1-a007299dace1/2.png/1242x2688.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/77/22/e0/7722e072-965f-56c9-886a-38511f934290/3.png/1242x2688.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/9a/13/17/9a13173d-5b2a-e4c3-e82b-6810a5479433/4.png/1242x2688.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/62/68/8c/62688c2c-d23f-3801-1ce0-9c3174761d31/5.png/1242x2688.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/af/9c/cf/af9ccf08-1a56-ff5a-efa1-ad4e548f142d/6.png/1242x2688.png)
- [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/2d/35/dc/2d35dc7e-8ea5-aa78-398b-02778299dd64/7.png/1242x2688.png)
- [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/96/11/8d/96118d47-1dae-e3a4-65f8-d9ef02283443/8.png/1242x2688.png)
- [Screenshot 9](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/fe/27/d1/fe27d10f-15a9-3312-c6d6-d4ea8ede5f4a/9.png/1242x2688.png)



## Diamond Trainer AI In-App Purchases
| Item | Price |
|------|-------|
| Hitting Subscription | 58.00 H$ |
| Combo Subscription | 98.00 H$ |
| Pitching Analysis | 58.00 H$ |



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## Diamond Trainer AI Available In
- [Denmark](https://apptail.io/app/diamond-trainer-ai-ntHx/denmark)
- [Hong Kong SAR China](https://apptail.io/app/diamond-trainer-ai-ntHx/hong-kong)
- [Croatia](https://apptail.io/app/diamond-trainer-ai-ntHx/croatia)
- [Japan](https://apptail.io/app/diamond-trainer-ai-ntHx/japan)
- [Russia](https://apptail.io/app/diamond-trainer-ai-ntHx/russia)
- [Saudi Arabia](https://apptail.io/app/diamond-trainer-ai-ntHx/saudi-arabia)
- [Türkiye](https://apptail.io/app/diamond-trainer-ai-ntHx/turkey)

---

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