Accuracy without the sales fog.

What accuracy can you expect from True Carry?

True Carry estimates ball flight from iPhone camera video, so results vary with camera placement, lighting, frame-rate support, calibration, the ball, and the club. It is designed for practice and entertainment, not professional club fitting, tournament measurement, wagering, or any use that depends on certified precision.

Internal validation snapshot

Internal engineering results from range sessions on August 22–23, 2026, measured against a Toptracer bay unit and a Garmin launch monitor recording the same swings. Not an independent certification. n = 181 shots. “Median error” means half the shots were closer to the reference and half were further away.

These figures cover shots the app actually reported a number for. When ball tracking is poor — glare, low light, the ball leaving frame early — True Carry withholds the shot rather than show a value it does not trust, so a withheld shot never reaches you as a wrong number. We do not yet publish a withhold rate, because measuring it honestly requires logging every attempted swing including the ones no reference device caught either. That is part of the benchmark described at the end of this page.

Carry is the weakest number and we are not going to dress it up. Most shots land close to the reference, but a minority miss badly, and those misses concentrate in driver, 3-wood and hybrid — where small errors in launch conditions compound over a long flight. Our internal goal is 2 yards of median error and we are a long way from it.

Ball speed and launch angle are close to the limit of what we can even verify. On the same swings, the two reference devices disagree with each other by a median of 1.3 mph on ball speed and 2.3° on launch angle — comparable to our own error against them. Club speed is measured optically from the club shaft, where the two references disagree with each other by a median of 5.4 mph — wider than our own difference from either one.

How to get the most repeatable result

• Use a stable tripod and keep the phone directly above the ball at the guided 41-inch height.
• Center the ball in the on-screen target and wait for the Ready state.
• Use even lighting with clear contrast between the ball and the background.
• Compare sessions only after using the same device, placement, ball, and environment.

See the complete iPhone launch monitor setup guide before judging a session.

What we will publish next

A stronger public benchmark needs the tested iPhone models, app and model versions, reference-device setup, shot count, club mix, missed-shot rate, error distribution, and downloadable raw data. Until that study is published, True Carry will describe its outputs as estimates.