ChainRanger

ChainRanger turns your phone into a disc golf rangefinder. Point your camera at the basket and the on-device AI finds the chains and shows the distance instantly — in meters or feet, plus whether the basket sits uphill or downhill. No laser, no GPS waiting, no pacing it off.

HOW IT WORKS
• Aim your camera at the disc golf basket.
• ChainRanger detects the basket in real time and calculates the distance.
• A stabilized reading shows on screen.

All image processing happens 100% on your phone. Camera frames are never uploaded anywhere.

KNOW YOUR CIRCLES
Distance to the basket is not just a number — it decides which rules and stats apply:

• Circle 1 (C1) is everything within 10 meters (33 ft) of the basket. Inside Circle 1 the putting stance rule applies: after releasing the putt you may not step past your marker, you must show full balance behind it. ChainRanger tells you instantly whether you are inside the 10 m circle, so a borderline lie never catches you out.

• Circle 2 (C2) reaches from 10 to 20 meters (33–66 ft). Putts made from here separate good rounds from great ones.

• Parked, C1X and C2 are the stat categories that actually measure putting: Parked is within 3.3 m (11 ft), C1X counts Circle 1 putts excluding parked tap-ins, and C2 covers the long range. When you know the exact distance, every putt goes into the right category.

READ THE ELEVATION — AND WHAT IT PLAYS LIKE
Distance alone doesn't tell the whole story: an uphill basket plays longer, a downhill one shorter — and because a disc glides, every meter of height changes the throw far more than in ball golf. ChainRanger reads your phone's tilt to show the up/downhill angle and the height difference, and Full Range adds the plays-like distance from a disc-flight model, so you can pick your disc and power with confidence.

LIDAR ASSIST ON IPHONE PRO
On LiDAR-equipped iPhones, ChainRanger fuses the scanner with the camera measurement for sharper readings at close range. LiDAR also unlocks tape-free calibration — dial in your camera and basket dimensions without a measuring tape. On other iPhones the app measures with the camera only.

PUTTING PRACTICE WITH STATS
Set up at exact distances instead of guessing. Tap Save to keep the distance and mark the putt made or missed, or log a putt series from one spot. Stats show your putting percentage by circle and distance — watch your C1X percentage climb. Your log stays on your phone.

FREE AND FULL RANGE
• Free: exact distance everywhere inside Circle 1 (10 m) — a complete putting trainer. Try Full Range with 10 free full-range readings.
• Full Range (one-time purchase, no subscription): exact distance at all ranges, including Circle 2 and beyond, plus the plays-like distance on sloped holes.

FEATURES
• Real-time disc golf rangefinder using your camera
• Distance to the basket in meters or feet
• Save log with putting stats
• LiDAR assist on iPhone Pro models
• Uphill/downhill angle and height difference to the basket
• Plays-like distance on elevation (Full Range)
• Basket presets for PDGA-verified target models, or dial in custom dimensions
• Calibrate at any known distance — the hole length from the tee sign will do
• Three detection modes: Simple is the lightest, Pro sees the farthest, Balanced fits most iPhones best
• Stabilized reading
• Hold button to freeze the reading
• Magnifier zoom to reach far-away baskets
• Supports multiple rear camera lenses with per-lens calibration
• Smart exposure that locks onto the detected basket, tap to adjust
• Power-saving mode and automatic heat protection for long sessions
• 100% on-device AI — works without a network connection

GOOD TO KNOW
• ChainRanger measures the distance from you to the basket. To measure the length of your throws, use a GPS measuring app or a laser rangefinder.
• ChainRanger is a measuring aid for practice, casual rounds and competition.

Grow your range. Find the chains. ChainRanger.