See every shot
What it does
Arm speed at release
Ball speed at the bottom of your swing, in mph or km/h, for every shot.
Release consistency
Every 1st ball is rated against your usual release, so you know when something changed.
1st and 2nd ball
Tap which ball you're throwing before each shot. Spares are tracked separately.
Countdown and wrist tap
A configurable countdown gives you time to set up; a tap on your wrist says go.
Sessions
Practice, league, and tournament sessions, with names you use often a tap away.
Private by design
No account, no ads, no tracking. Your data stays on your iPhone and in your own iCloud.
Support
What do I need to use Swinger?
An Apple Watch running watchOS 10 or later, paired with an iPhone running iOS 17 or later. Install Swinger on your iPhone and it becomes available for your watch too.
Which wrist should I wear my watch on?
Your bowling arm. Wear it snug so it moves with your wrist. Right-handed bowlers will usually need to move the watch to their right wrist while bowling.
How do I measure a shot?
Start a session in the iPhone app, open Swinger on your watch, and tap 1st or 2nd for the ball you're about to throw. After the countdown your watch taps your wrist — then bowl. The shot is detected automatically and appears on both devices.
Why is my speed different from the lane display?
Swinger estimates the ball's speed at release from how fast your arm swings. Lane displays usually show the ball's average speed down the lane or its speed near the pins, and the ball slows on the way, so Swinger often reads a little higher.
How can I make speeds more accurate?
Set your arm length in Settings, measured from your shoulder joint to your wrist. Swinger works out ball speed from how fast your arm swings and how far the ball is from your shoulder, so an accurate value gives accurate speeds.
What does release consistency mean?
Once a session has three 1st balls, Swinger uses your typical release in that session as a baseline and rates each 1st ball as Consistent, Slightly off, or Off. 2nd balls aren't rated, because spare releases are often deliberately different.
A shot wasn't detected. What should I do?
Tap Stop on your watch to capture what was recorded. If measuring stops when your arm is down, make sure Health access is allowed for Swinger on your watch — Swinger runs a bowling workout to keep measuring while the screen is off.
Can I change the countdown before measuring?
Yes. In the iPhone app, open Settings and adjust Start delay, from none up to 30 seconds.
Is my data backed up?
Yes, if you use iCloud. Your shots, sessions, and settings are kept in your private iCloud account, so they come back if you delete and reinstall Swinger or get a new iPhone. If iCloud is off, Swinger works the same, and your data is included in your regular iPhone backups.
How do I delete shots or sessions?
In Reports, swipe left on a session or press and hold it, then choose Delete. You can also delete individual shots inside a session.
Still need help?
Email support@ericmarschner.com and include your iPhone and Apple Watch models.