The full plan,
and the voice in your ear at mile 20.
CarbRate builds your race-day fueling from your body, your gut, and the actual course you're running, then coaches you through every feed, live. Pro is the whole thing: every mile placed on your real course, and a calm voice in your ear at mile 20.
11 minutes faster in the research, from a fueling schedule alone. see the study ↓
Start monthly. Or buy the race.
Full Pro is $9.95 a month, cancel anytime. Prefer no subscription? The Race Pass covers one whole race for one flat price — nothing to remember to cancel.
Start sooner, prove more. Your gut needs weeks of rehearsal to trust a new fuel — the earlier you begin, the more of race day is already proven before the gun.
Checkout opens in your browser — about a minute, with Apple Pay. Your plan unlocks in the app the moment you pay.
What Pro does that a gel every 30 can't
Every plan unlocks all of it, no tiers. Here's what "all of it" actually saves you from.
Cross the line fueled, not fading
A gel every 30 minutes is 50 g/hr, flat: the same number for a 120-lb first-timer and a 180-lb vet. Under-fuel and the wall still comes.
Your plan is sized to your body, goal and gut, so you take exactly what your race costs.
Your real course, not an average one
Generic plans space fuel by the clock, so gels land mid-climb, right where your stomach has the least to give.
Every feed sits on a real aid station, caffeine before the hills, never a gel on them.
Never do math at mile 20
Late in a marathon, arithmetic is the first thing to go. Miss a feed and you pay for it at mile 22.
A calm voice and a wrist buzz call each feed before it's due. You just run.
A plan that adapts when race day does
A fixed plan has no answer for an 84°F morning or a dropped bottle.
Carbs shift into your drink to protect your stomach, and Plan B recomputes the rest of the race on the spot.
"Why not just a gel every 30 minutes?"
Because that rule was written for nobody in particular. Here's the same race, two ways.
| Generic advice | Your CarbRate plan | |
|---|---|---|
| Timing | By the clock. Two gels land mid-climb, where your stomach has the least blood flow to spare. | By the course. On real aid stations, before the hills, never on them. |
| The day | Fixed. No answer for heat, a missed feed, or how much you sweat. | Live. Recomputes with the forecast and your own tests. |
| At mile 20 | You're doing arithmetic on tired legs, hoping you got it right. | A calm voice: "gel at the station in 0.4 miles." You just run. |
| Fuel | 50 g/hr, flat — the same number for a 120-lb first-timer and a 180-lb veteran. | Sized to you: your weight, goal and gut, rehearsed before race day. |
Your fuel, placed on the real course
Not spaced by a stopwatch. Put where the hills and the water actually are.
Caffeine before the Newton hills. Nothing on Heartbreak. Every feed on a station that exists. As of July 2026, no other app pairs this with a live voice on race day.
What a schedule is worth
Not our claim. A peer-reviewed one.
In a matched-pairs study, marathoners handed a structured, scientifically-based fueling schedule finished 3:38:31 vs 3:49:26 — about 11 minutes (4.7%) faster than runners fueling by feel, with no extra stomach trouble. The free-choice group under-ate by roughly a third without knowing it.
Training your gut alone is guesswork
Your stomach, not your legs, usually decides how much you can take. Here's what we do that going solo can't.
The average marathoner takes in about 38 g/hr by feel. The target is 60 to 90: half the fuel, and the wall shows up anyway. You can't cram it. Absorption is a trained capacity, like your legs, and your gut is a muscle you build over weeks.
Two weeks of practice cuts gut discomfort 26–47% and lifts carb absorption 45–54%. It's the difference between a plan on paper and one your stomach has already run.
Runners on this fueling method
"These calculators are absolutely enlightening. I had no idea just how off I was."
"Organized so well it makes the sheer volume of information easily digestible. I feel confident for race day."
Questions people ask before buying
Why is there no free trial or money-back guarantee?＋
What exactly is the Race Pass?＋
Race Pass or Annual — which is for me?＋
What happens after my 18 weeks (or if I cancel)?＋
Why do I check out on the web?＋
I'm outside the US — can I still use it?＋
Fuel the
whole 26.2.
The full plan, live race-day guidance, and the gut-training program. From $9.95 a month, cancel anytime — or one flat Race Pass with nothing to cancel.
Start monthly →