FuelFlow

Train like you want to race. Stop Bonking. Start PR’ing.

Built for the Dark Miles

FuelFlow is a real-time fueling app for endurance athletes — the ones who know "just send it" stops working past mile 21. Whether you're prepping for your first marathon or your tenth 100-miler, FuelFlow tracks what you're putting in versus what your body is asking for, and tells you when to do something about it.

NEW: ULTRA MODE (EARLY ACCESS)

Build a race plan on the web at fuelflow.run — course, aid stations, pacing, per-phase fueling targets — then race it on iPhone and Apple Watch.

• Aid station tracking: know what's coming and what your next segment needs • The Stack: an adaptive UI that simplifies as you get deeper into the pain cave, so the right action is always one tap away • Crew Mode: generate PDF crew cards and share links so pacers and crew know what to hand you, when • Course-aware fueling targets that respect terrain and pace • Works offline once your plan is downloaded

Enable Ultra Mode in Settings.

TRACK WHAT MATTERS, IN REAL TIME

Log carbs, sodium, and water as you go — on iPhone or Apple Watch. No mental math at mile 18 or mile 93. Smart status messages tell you whether to fuel now, soon, or whether you're crushing it, based on where you are in the activity — not just hourly goals.

APPLE WATCH THAT ACTUALLY WORKS

Log nutrition without pulling out your phone. Quick Access Grid puts your go-to fuel one tap away. The watch app runs standalone — no phone required. Alerts when you fall behind.

AUDIO COACHING: EYES UP, HANDS FREE (EARLY ACCESS)

Spoken nutrition reminders during activities. Eight crew personalities from zen to drill sergeant.

BUILT FOR ENDURANCE SPORTS

• Running — road, trail, ultra • Cycling — road, gravel, mountain • Triathlon and multisport • Nordic skiing, swimming, hiking, mountaineering

YOUR DATA, YOUR WAY

Export every session: CSV, PDF (with route map and heart-rate graph), TCX, GPX, FIT. Import workouts from Apple Health, Strava, Garmin Connect, or upload FIT files from your bike computer to add nutrition to past activities.

SMART TRACKING FEATURES

• Customizable nutrition goals per sport • Sweat profile data with H drop data import • Pre-activity nutrition logging • Weather and route data • GI distress and energy level tracking • Personal records and trend analysis

PRIVACY FIRST

Your health data belongs to you. iCloud syncs privately across your devices. We don't sell your information or share it with third parties.

RACE-DAY TESTED

Built by ultrarunners. Tested at trail 50s, 100Ks, and 100-milers. Sharpened every release.

START FUELING SMARTER

Download FuelFlow and stop wondering if you're doing it right.

Your next personal best starts here.

EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/