The dual angle calculator
Type the Layout and the calculator draws the pin, PAP and CG on the ball, with the numbers you'll mark it from.
The Fit, drawn
Spans, hole sizes and pitches laid out on a grip diagram, so you can check a Fit at a glance before you drill.
Every Bowler, one tap away
Search your Bowlers by name and open anyone's Fit, Release and every ball you've drilled for them.
A Bowler's record
Their current Fit and Release in one place: spans, hole sizes and pitches, PAP, axis tilt and rotation, speed and rev rate.
Every ball drilled
Each ball keeps the Layout, Fit and Release it was drilled to. Retired balls stay in the Bowler's history.
Layout calculator
Enter a dual angle Layout and get the pin, CG and PSA positions measured from the centre of grip, with a diagram to check by eye.
Why Driller's Book
Drill sheets pile up, fade and get lost under the press. Driller's Book replaces the stack with one record per Bowler, there whenever they walk back in.
Works in the shop
By the drill press, with or without signal
Everything except syncing works offline. With a subscription, look up a Bowler on your iPhone at the counter and lay out their ball on the iPad.
Pricing
Free, or Pro
Free
For trying it, or a small book of Bowlers.
- Up to 5 Bowlers, each with any number of Drilled Balls
- The full layout calculator
- Records stay on your device
- No account needed
Pro Monthly or yearly
A$9.99 a month or A$79.99 a year, through the App Store or Google Play.
- No limit on Bowlers
- Records sync and back up across your devices
- Cancel any time in your store settings
If a subscription ends, syncing stops and everything on your device stays usable.
Your Bowlers' records
You're keeping other people's measurements. Here's where they go.
Support