Not magic. Method.

Eight checkpoints, twelve metrics, fourteen drills, one priority fix at a time. This page documents the whole pipeline — what we measure, how we rank faults, and what we deliberately don't claim.

The eight checkpoints (P1–P8)

Every swing is sampled into eight phases — the same vocabulary tour coaches use. We score each phase independently and flag the single phase where your priority fix lives.

The four categories · twelve metrics

Each metric is calibrated against tour benchmarks where one exists, with a confidence tone (good / warn / bad) you can trust at a glance. We never invent a metric — if a frame can't support a measurement, we lower its tone confidence rather than guess a round number.

How priority fix is chosen

A single swing usually has 2–4 detectable faults. Working on all of them at once is how amateurs stay amateur. Caddio ranks faults by:

1. Mechanical leverage. How much this fault propagates downstream. A P3 trail-elbow flare cascades into a P4 across-the-line, a P5 over-the-top, and a P7 face-open impact. High leverage = high rank.
2. Confidence. How clearly the fault shows in the frames. Lighting, framing, and camera angle all affect this. Faults below a confidence threshold are omitted entirely — we don't guess.
3. Severity. How far the metric sits from tour benchmark. A 1° path deviation is noise; a 6° deviation is the lead.

The top-ranked fault becomes your “priority fix” for the week. Below it, we surface up to 2 supporting fixes for context — but the practice plan biases hard toward the priority.

The drill catalog

Fourteen drills cover the most-common mechanical faults across the swing. Caddio picks the best fit from the catalog — it never invents a drill the app doesn't have.

Each drill includes setup, target reps, expected time commitment, and the fault categories it addresses. See the full list at /drills (sign-in required during beta).

What we don't claim

Sub-degree path accuracy. Phone video at 30–60 fps is not a TrackMan. Path and face angles are directional, not surgical. We're still calibrating across phone hardware — the confidence tone on every metric tells you how much to trust the number.

That you'll shoot lower scores. Mechanical faults are necessary but not sufficient. The drills are tested, but your range time is yours.

That we replace your coach.Caddio is the scaffolding for the 51 weeks between lessons. If you want a real coach's eyes on a specific swing, you can send any report to a coach from our directory — they price per-review. The Coach plan on /pricing is a separate product for instructors who want to manage feedback for multiple students.

That we've seen every swing.If the model isn't confident, it tells you. We'd rather flag a fault with 60% confidence than invent one with 99%.

Who's building this

Caddio Club is built by David Lopez, the founder. We're keeping the founding cohort small on purpose — small enough that every member gets a direct line to the people building the product. Coaches are joining the platform now to review real swings.

Questions, complaints, suggestions: hello@caddio.club. Replies come from a real inbox, usually within a day.