The Tools
Every golfer's era starts somewhere different. Some need the strategy first. Some need the data. Some just need to know how far they actually hit the seven iron. Here's the full stack — what each tool does, who it's for, and how London uses it.
These are the platforms and hardware actively changing competitive golf. Not a random list of apps — the actual tools used by Tour players, college programs, and juniors who are serious about the shift. London uses DECADE and Draw More Circles personally. The Arccos Air sits in her bag. Everything on this page is something she'd recommend without hesitation.
Course Management & Strategy
Distance · Expectation · Correct Target · Analyze · Discipline · Execute
Created by Scott Fawcett · COO Alex Huang
Scott Fawcett built DECADE by combining shot distribution patterns with PGA Tour scoring data — creating a course management framework that tells you where to aim based on your actual shot pattern, not where you wish the ball would go.
His first test case was Will Zalatoris in 2014. Unknown junior, ranked 3,300 in the world. Under Fawcett's guidance using DECADE, he won the Texas Amateur, the TransMiss, and the U.S. Junior — and vaulted to #3 in the world in three months. Bryson DeChambeau used it to win the U.S. Amateur. The NCAA called it an unfair competitive advantage and banned Fawcett from teaching at college seminars.
DECADE COO Alex Huang works directly with juniors and college programs daily — distilling complex data into language that translates on the course.
London's take: "The shot pattern concept is what clicked everything for me. I wasn't playing my actual game — I was playing the game I thought I had. Once I understood my dispersion, every target decision changed."
Shot-data fueled strokes gained platform
CEO Hamish Mitchell
Draw More Circles (Circles) is a strokes gained intelligence platform built by coaches who have worked with world #1 players and Olympic teams. It tracks your data, analyzes every five rounds, identifies your three biggest improvement areas, and builds a practice plan around them.
Circles is partnered with College Golf Experience (CGX) — the recruiting camps that connect junior golfers directly with college coaches. Michigan State's head coach called it "the most comprehensive and intuitive statistics and player development program we have used in my time in college golf."
London's take: "I've been using Circles for two years. The practice plans are what separate it — it tells you exactly where to spend your time based on your actual numbers, not what you think you need to work on."
Shot Tracking Hardware
Gen 4 Smart Sensors + Arccos Air
1.2B+ shots tracked · 22M rounds · Gen 4
Sensors screw into the grip of every club. The new Arccos Air sits in your front pocket — no phone required — and captures every shot automatically. After a few rounds you have real club distances. Not your best. Not the one you hit in July. The one you hit 80% of the time.
The AI Caddie recommends what club to hit based on your personal data, adjusted in real time for wind, elevation, temperature, and humidity. Full strokes gained analytics broken down by category — so you can see exactly where you're leaking shots.
Ambassador opportunity: Arccos is actively working with competitive junior golfers with active social presence. If you're playing at a high level and posting consistently, the conversation is worth having.
Also Worth Knowing
Shot Scope
Watch-based · No phone · No sensors
Scotland-based platform tracking shots via GPS watch. No phone, no sensors, no setup mid-round. Clean interface, full strokes gained analytics.
Best for: Golfers who want zero phone dependency and clean hardware
Learn More →Shot Pattern
Dispersion mapping · Course strategy · iOS
Visual dispersion mapping so you can see where your shots actually land relative to your target. Excellent course preview tools and unusually granular strokes gained by shot.
Best for: Detail-oriented players who want to visualize their pattern
Learn More →Every Shot Counts
Mark Broadie · Columbia · The book
Mark Broadie's book that started the data revolution in golf. Not a textbook — reads like a conversation. The intellectual foundation behind all of this. Scott Fawcett has said it directly inspired DECADE.
Best for: Anyone who wants to understand why any of this matters
Get the Book →Garmin Approach
CT10 sensors · Watch integration · No subscription
If you're already in the Garmin ecosystem, CT10 sensors integrate directly and track your shots without an annual fee. Less analytical depth than Arccos but clean hardware with no recurring cost.
Best for: Existing Garmin users who want tracking without a subscription
Learn More →Some links on this page are affiliate links. If you purchase through them, we may earn a small commission at no extra cost to you. We only list tools London has personally used or would genuinely recommend. We don't take money to put anything on this page.