Race-day fueling and crew execution for ultras

Built from your runs, not someone else's average.

Targets honed from your own runs. Tolerance built at a pace you set. A race plan your crew can follow at every aid station, offline. Then what happens out there sharpens the next one.

Free to start. No card.

Works with zero signal
·
Syncs with Strava, Apple Health, and Health Connect
·
Free to start

Your targets · per hour

65gCarbs

610mlFluid

500mgSodium

The UltraFuel Today screen showing carb, fluid, and sodium targets per hour

Your targets · per hour

65gCarbs

610mlFluid

500mgSodium

The failure mode

You trained for months. Then mile 60 happened.

The plan was in a spreadsheet on your laptop. The pace band smudged. Your crew is at the aid station guessing what you wanted, and you have no signal to tell them. Nothing about that failure is a fitness problem.

How it works

Plan it. Train for it. Execute it.

01Plan

Built from your runs, not a chart.

UltraFuel reads the training you already log and turns it into carb, fluid, and sodium targets for race day. Population averages are only the starting point. The targets sharpen as you log more runs.

A race plan showing per-hour totals and fueling notes for each leg

02Train

A gut that's ready before the start line.

Stomach trouble ends more ultras than tired legs do. UltraFuel builds gut training into your weeks of prep so your body knows how to take the fuel on race morning.

The gut training program screen showing weekly carb targets

03Execute

Your crew already knows the plan.

Share the plan by QR code. Your crew sees what to have ready at every station, what time you're due, and how much. No account needed on their end. Works with zero signal.

The race-day crew tracker showing running carb, sodium, and fluid totals against plan

Offline-first

Built for places with no bars.

Your plan, your logging, and the live race tracker all work with zero signal. Data syncs in the background when a connection comes back. A dead zone never costs your crew an entry.

0 bars

needed to plan, log, or track

1 account

phone and web, same data. Plan on a big screen, execute on the trail.

Your runs come from where they already are.

Connect Strava, or pull workouts from your watch through Health Connect on Android and Apple Health on iPhone. Garmin, COROS, and the rest come through either one. Add a run by hand if you'd rather.

Strava
Garmin
COROS
Health Connect
Apple Health
Manual entry

Where this fits

You already have a watch, a coach, and a spreadsheet.

All three are good at what they do. Your watch records what happened. A training app analyzes it. A coach builds the block. A spreadsheet holds the plan until the moment you need it.

None of them execute the plan during the race, offline, with your crew looking at the same thing you are. That's the only job UltraFuel has.

Founder

Why I built this

I'm an ultrarunner with a stomach I've never fully trusted. It's cost me races. My wife was about to crew her first ultra, with no idea what I'd actually need at each aid station, and neither did I. UltraFuel is the answer to both: know what your gut can actually handle, and give your crew something better than a guess.

Your targets come from your own logged runs, and sharpen quickly as you log more. They're informational ranges, and they don't replace your doctor or dietitian.

CJFounder

Pricing

Free to start. Priced when it earns it.

Free, permanently

Strava, Health Connect, and Apple Health sync, manual logging, the gut-training program, your full fueling profile, core insights, one race with full aid-station planning and a printable crew sheet, solo race-day tracking, and joining someone else's race as crew.

Race Kit

$69.99 a year, or $11.99 a month

14 days free on your first subscription

Unlimited races, race-week carry plans built from your own training data, live crew tracking, and the deeper analysis layer.

Start free. Add Race Kit inside the app, or on the web after signing in, when a race is on the calendar. Cancel anytime. See the full breakdown

Questions

The things worth knowing first.

Does it really work with no signal?

Yes. Your plan, your logging, and the live race tracker all run on your phone with zero signal. Data syncs in the background when a connection comes back, so a dead zone deep in the mountains never costs your crew an entry.

What do I actually get for free?

Strava, Health Connect, and Apple Health sync, manual logging, the gut-training program, your full fueling profile, core insights, one race with a plan, solo race-day tracking, and joining someone else's race as crew. Those stay free. Race Kit adds the rest.

Which watches and apps does it work with?

Connect Strava directly, or pull workouts from your watch through Health Connect on Android and Apple Health on iPhone. Garmin, COROS, and other watches that write to either one come through that way. You can also add a run by hand.

Is there an iPhone version?

Yes. UltraFuel is on the App Store and Google Play, with Apple Health import on iPhone and Health Connect on Android. The web app shares the same account and works in any browser, so you can build a race plan and read your numbers there too — watch sync and race-day tracking live on the phone.

How does my crew see the plan?

They scan a QR code. No account, no install. They see what to have ready at each aid station, when you're due, and how much, and they can log what you actually took. Crew access covers that one race and expires 48 hours after you share it.

Is my data private, and can I delete it?

We don't sell your data, show ads, or track you in the app. Crew members see only the race you share, never your training history. Export a full backup any time, and deleting your account removes everything across your devices and our servers. Details in the Privacy Policy.

What is gut training, exactly?

Stomach trouble ends more ultras than tired legs do. UltraFuel raises how much fuel you take on long runs gradually, based on how you report each run felt, so race-day intake is something you have already practiced. It's a training process, not a medical program.

Do I need a crew to use this?

No. The fueling profile, gut training, race plan, and solo race-day tracker all work on their own. Crew sharing is there when you have one.

Your next race is already on the calendar.

Get the plan dialed before you're standing at the first aid station trying to remember it.

Free to start. No card.