Disc Looper How-To: Let Your Virtual Caddie Pick the Disc

A *looper* is a caddie. Disc Looper is the one you don't have to tip: you give it the hole, the wind and your bag, and it tells you which disc to throw, backhand and forehand, then shows a stick figure how to throw it. It runs in your browser, with no account.

What a photo can and can't do

Your looper is honest about this: it can't recognize a hole from a photo, and it won't pretend to. Disc Looper uses your photo as a scratch pad. Tap to mark the tee, the basket and any hazards. If you shot it from the tee looking at the basket, it can suggest which side is out of bounds. You can always overrule that.

Step by step

1. Photo (optional). Take or choose a picture. If the photo carries a GPS tag, Disc Looper reads it locally. Many phones strip location when you pick from the library, so it may not. 2. Where are you? Use the photo's GPS, your device location (your browser asks first) or search a town. Then ask for nearby courses. 3. Confirm the course and hole. Courses come from OpenStreetMap (ODbL), so you only see what mappers have drawn. If it finds holes, it sorts them by distance from your GPS spot, and *you* pick. If the hole isn't mapped, type the distance, the bend and the out-of-bounds side. 4. Conditions. One tap pulls wind, gusts, temperature and rain from Open-Meteo, or you can type them in. Give it the hole's compass bearing so it can split wind into headwind and crosswind. 5. Your bag. Disc Looper reads the bag you built in In the Bag from this browser. Lefty? Flip the toggle.

What it's doing under the hood

The distance estimate uses the same rule of thumb as the flight chart: about 140 + 18 × speed + 6 × glide feet for an average arm. Forehands are modeled shorter. Turn and fade move the disc sideways. A headwind shortens the throw and makes a disc act more overstable, a tailwind does the reverse, and a crosswind pushes the finish downwind. These are heuristics, not measurements. The wind itself is a forecast model, not a reading from the tee.

When the bag can't do it

If nothing you carry reaches the hole or shapes the line, Disc Looper says so and points at In the Bag. It never invents a mold. Check flight numbers if the S/G/T/F still looks like code.

The stick figure

The figure walks through setup, reach-back, pull-through, release and follow-through for backhand or forehand. Its cues are generic technique tips. They're a starting point, not a replacement for a coach or a clinic.

Privacy and sources

Photos never leave your phone. Course data comes from OpenStreetMap contributors through public Overpass servers, weather and place search come from Open-Meteo, and each request only goes out when you press a button. UDisc doesn't offer a public course API, so nothing here comes from UDisc.