How we read the numbers
and what we judge by

OhMyShaft doesn't sort swings into "good" and "bad". It's a tool that compares your measured numbers with the recommended range for the same speed band and shows which items are off, and whether that's an equipment problem or a swing problem.

Why it's "your speed band" rather than "the average"

The most common misunderstanding in driver analysis is an absolute standard like "14 degrees of launch is good" or "2,500rpm of backspin is about right". It doesn't hold up, because it leaves speed out of the picture.

A golfer at 80mph and a golfer at 110mph have different optimal ball flights. A slower speed needs a higher launch angle and more spin to get the ball up; a faster speed hit with that combination balloons, drops out of the sky, and loses distance. The same "14 degrees of launch" is right for one and a loss for the other.

So this tool sets your band from clubhead speed first, then compares only against that band's ranges. The specific numbers are all published on the criteria page.

The order the analysis runs in

1. It reads your swing result screen AI reads a photo of a launch monitor screen — Trackman, GOLFZON, Kakao VX, GDR and so on — and moves the numbers into a table. Item names differ from device to device (clubhead speed / club speed / Head Speed), so we keep a dictionary of the labels that point at the same value. Units are converted too: m/s, km/h, and meters become mph and yards.
2. You check the values Every number that comes in can be edited. Items the AI couldn't read are left blank and marked "needs checking". We don't guess and fill them in — inventing a missing value throws off the whole analysis.
3. Your band is set from clubhead speed Which band your five-swing average clubhead speed falls into decides the recommended ranges for launch angle, backspin, and angle of attack.
4. Each item is judged by how far off it is Inside the range is good, outside is caution, far outside is critical. Each judgment comes with a sentence on why we saw it that way.
5. Causes are split into equipment, swing, or both A low launch angle is an equipment problem you can move with loft or shaft kick point. A badly out-to-in club path is a swing problem that a new shaft won't fix. That split is the heart of the FIT SCORE calculation.
6. Shaft fit is converted into a score It starts at 100 and takes points off for each finding. Items caused by equipment count for a lot, swing technique issues for a little. The more a problem could be solved by changing the shaft, the more it weighs on the score.
7. Three alternative shafts are picked We work out which way weight, flex, kick point, and torque should move compared with your current specs, and pull the shafts in the catalog that fit that direction.

The concerns you check are used for reference only

During the analysis you can select items like "a slice is my problem" or "my distance is short". But when that conflicts with the measured data, the data wins.

Say you checked "low flight is my problem" but your measured launch angle is already above the recommended range: the tool won't recommend raising your flight further. Instead it tells you "the concern you checked and the measurements don't match". Feel and measurement differ very often, and following the feel in those moments takes you to the wrong equipment.

AI is used only to read the numbers

We use AI only to pull the numbers out of photos and to write the results up in sentences. AI doesn't make the judgments. Those are calculated in your browser, by the rules set out above.

So the same data always gives the same analysis. No AI answering differently depending on its mood, and if you want to know the criteria, you can check the numbers yourself on Criteria.