A product by Ness & Cavalier

Better distance control.
Fewer three-putts.

Calibrate your stroke, account for distance and slope, and rehearse a repeatable tempo—without turning your practice session into a physics lecture.

One purchase.No subscriptions. No ads. No nonsense.
Lag Doctor app home screen
Distance control • Personal calibration • Green-speed settings • Tempo practice • Works offline •Distance control • Personal calibration • Green-speed settings • Tempo practice • Works offline •
The 40-foot problem

Long putts shouldn’t feel like a coin toss.

01 / Calibrate

Your stroke. Your baseline.

Start with one comfortable putt on the practice green and build the app around your natural motion.

02 / Adjust

Distance meets slope.

Choose the putt length, add an uphill or downhill adjustment, and tune for the pace of the green.

03 / Rehearse

Commit to the roll.

Use the suggested takeaway length and tempo cues to make a confident, repeatable stroke.

Built for the practice green

A focused tool for golfers who want better speed control—not another screen demanding attention during the round.

Personal

Calibrated to you

Recommendations begin with your own putting stroke, not a one-size-fits-all swing model.

Practical

Made for real greens

Account for distance, slope and green speed while keeping break, grain and feel in your hands.

Private

Offline by design

No account. No analytics. No location tracking. Your calibration stays on your device.

iPhone and Android

Coming soon.

C$29.99
Final regional pricing may vary by app store.