Tools · Your caddie

Disc Looper: your virtual caddie

Snap the hole, tell your looper where you are, and it'll check the wind, pick the best backhand and forehand from your bag, and show a stick-figure pro (well, a stick figure) how to throw it. A looper is a caddie, and this one works for free and never complains about your lies.

Photos are processed in your browser and never uploaded. No account, no keys. The only things that touch the internet are OpenStreetMap (courses) and Open-Meteo (weather), and only when you press the buttons.

Straight talk from your looper: a photo can't tell us which hole you're standing on, so we don't pretend it can. The photo is for you to mark up (tee, basket, hazards). Course matching comes from GPS (photo tag, your phone, or a place search) plus your confirmation, using open OpenStreetMap data. If a course or hole isn't mapped, you type the distance in, and we work with that. Flight distances are rule-of-thumb estimates for an average arm.

1. Show your looper the hole (optional)

Take or choose a photo

2. Where are you?

…or search a town (finds the area, then we look for courses)

Course and hole data © OpenStreetMap contributors, ODbL, via Overpass servers. Coverage varies a lot: plenty of courses are mapped without hole lines.

3. The hole

Distance, tee to basket (ft) Bearing, tee → basket (° from north) Shape Out of bounds Elevation change (ft, + uphill, − downhill) Par (just for you)

No compass? Open your phone's compass at the tee, face the basket, and read the degrees. Bearing is what lets us split the wind into headwind and crosswind.

4. Conditions

Wind (mph) Wind from (° , 0 = from the north) Gusts (mph) Temperature (°F) Rain (mm/h)

Weather: Open-Meteo.com (CC BY 4.0). It's a model forecast for the coordinates, so trust the flag on the practice basket over the app if they disagree.

5. Your bag

Loading your bag…

I throw left-handed (mirrors every flight)

Give your looper a distance (step 3) and it'll get to work.

The hole, as your looper sees it

The map appears once your looper has a distance to work with. Nothing here is loaded from a map server: it's drawn by this page.

How your looper does the math (heuristics, not measurements)

Base distance comes from the same model as the flight chart: 140 + 18 × speed + 6 × glide feet, capped at 425, for an average arm. Forehands are modeled at 92% of that. These are our rules of thumb, not measurements of your arm or the disc.
Turn and fade push the disc about 9 ft and 10 ft per point sideways (mirrored for forehand and for lefties).
Headwind/tailwind: each mph of headwind trims about 4.5 ft and makes a disc behave about 0.06 stability points more overstable (tailwind does the reverse). The wind speed is the forecast at 10 m, so it's a ballpark.
Crosswind shifts the finish about 0.7 ft per mph per 100 ft of flight, away from the wind.
Temperature and rain aren't put into the flight math, because reports about how temperature changes flight conflict. We just flag grip and plastic feel.
Elevation: "plays-like" distance adds 1.5 ft per foot of climb (and subtracts it going down).
Picking: every disc in your bag is flown through the model, then scored on getting to the distance without wildly overshooting, finishing the way the hole bends, and staying off your out-of-bounds side. Lowest penalty wins. If nothing fits, we say so and point at In the Bag.

New to this? Read the Disc Looper how-to. Form cues on the stick figure are general technique tips, not a replacement for a coach or a PDGA clinic.