Pre-launch · iOS & Apple Watch
ReFuel tracks your real-time energy balance — calories burned vs. calories consumed — during every run, ride, or triathlon, then tells you exactly when to take a gel, reach for your bottle, or pop a salt tab.
ReFuel sits at the intersection — a performance platform that treats fueling as a training variable, not an afterthought. Built for serious endurance athletes who want to know not just how they're performing, but why — and what to eat, and when.
Planning, food logging, energy analysis, training load history, and structured workout building.
Reads from iPhone, displays what matters mid-session, fires haptic fueling alerts at the right moment.
From planning your fueling to tracking your progress — every screen built for endurance athletes.
Calorie burn calculated live from heart rate, pace, and sport type, with a glycogen depletion model per sport and intensity zone.
Program session nutrition before you start. GU, Maurten, Naäk, SaltStick, Nuun, Precision Hydration — pre-loaded profiles, custom entry supported.
Live red/green area chart of calorie surplus vs. deficit, with fueling alert markers pinned at the moment of each intake.
LTL, STL, and SRB — fitness, fatigue, and form — inspired by popular performance management philosophy.
Customisable, outdoor-legible data grid. Screen tint shifts functionally: green (fueled) → amber (attention) → red (act now).
Tracks energy availability across sessions and flags chronic under-fueling patterns for review with your coach.
Nine launch sport modes, each with a tuned calorie model and carb protocol.
Import a GPX route and get a terrain- and elevation-adjusted calorie burn estimate for your sport, intensity, and body mass.
Live heat index and humidity automatically bump your carb, hydration, and sodium targets — with a manual override when you need it.
Auto-fill or drag-and-drop gels, drinks, and salt tabs onto a session timeline, tuned to each sport's carb protocol range.
A short metabolic profile personalizes every calculation — no two athletes burn fuel the same way.
Tell ReFuel whether you eat a mixed/standard diet, low-carb, or keto/fat-adapted — it shifts your carb dependency and fat-burning crossover point accordingly.
New to endurance, some experience, or highly trained — plus how long you've been fat-adapted, if applicable — refines your fueling ceiling.
Let ReFuel know whether you already train with carbs, so recommendations match habits you've built rather than a generic protocol.
Relative Energy Deficiency in Sport (RED-S) is a serious risk for endurance athletes who chronically under-fuel relative to training load. ReFuel tracks energy availability across sessions — not just individual workouts — and flags patterns firmly, evidence-based, never alarmist.
“Your energy availability has been low 4 of the last 7 days.”
— Example coach-style promptNo account, no server, no data collection. ReFuel is built to run entirely on your device.
Open the app and start training. There's no sign-up, no login, and no account to manage. But don't worry — you can still connect Strava and share your workouts to show off.
Your workouts, fuel plans, and metabolic data are stored locally on your phone — never uploaded to a server. If you enable iCloud sync, it's backed up privately to your own account, not ours.
ReFuel reads and writes workout, heart rate, and pace data with Apple Health to power its calculations. If other apps you use — like calorie counters — sync into Health too, ReFuel can read that data as well.
