# TrueLine: Bowling Ball Tracker — Speed, hook & entry angle

> Speed, hook & entry angle (iPhone/iPad app by ADAM CHENGER ZHU.)

- Source: https://appshunter.io/ios/app/trueline-bowling-ball-tracker/id6801953797 (this page in markdown: same URL + `.md`)
- Developer: [ADAM CHENGER ZHU](https://appshunter.io/developer/6801953799)
- Category: Sports, Health & Fitness
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 7 MB
- Languages: American English
- Released: 2026-08-24
- Data updated: 2026-09-28

## What is TrueLine?

TrueLine turns your iPhone into a ball-motion tracker. Prop it behind the approach and bowl. Seconds after each throw, you see the numbers serious bowlers pay thousands to get, computed entirely on your phone.
  
WHAT IT MEASURES
  • Ball speed
  • Board at the arrows
  • Launch angle 
  • Breakpoint board and distance
  • Entry board and entry angle
  • Total hook, in boards 
  • Pocket hits 
  
SEE YOUR GAME
  • Your throw replayed with the tracked path drawn on it
  • Every line of a session fanned on one lane view 
  • Trends across sessions: speed, hook, entry angle, pocket %
  • Compare your arsenal: per-ball speed, hook, and pocket rate
  • Target-line practice: pick a board, get scored on hitting it
  • Share cards: one tap turns any shot into a post-ready image
  
MADE FOR PRACTICE
  • Calibrate once per phone placement, then just bowl
  • Works at any center on any lane, no extra hardware needed
  • Analyze footage you already have from your camera roll

PRIVACY
Everything runs on your iPhone. There is no account and no subscription, and nothing is ever uploaded anywhere. Your first 10 throws are free. A single purchase unlocks TrueLine forever.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| TrueLine Unlimited | $14.99 | one-time |


## Is TrueLine safe?

Not enough ratings yet to assess TrueLine.

## Is TrueLine legit?

TrueLine: Bowling Ball Tracker has limited verification signals. The AppsHunter Legitimacy Score for TrueLine is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-08-24

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-28.*