For endurance and ultra runners
You've already run the experiment. Nobody wrote down the result.
That heat. Those climbs. Those hours. What your gut did on those days is the only fuelling evidence that's actually about you, and nothing kept it. Absorb is the record you never kept, and the race plan that falls out of it.
The problem
The day it goes wrong, you rarely find out why
Hour eleven. A climb you've never done on tired legs, and a stomach that stops taking anything. You walk it in, or you stop. Months later you can't remember what you'd been taking, how warm it really was, or whether the last three long runs had been trying to tell you something.
Injury ends some races. The gut ends a lot of the rest, and unlike the weather, the gut is the part you can rehearse. Rehearsal only counts if somebody wrote down what happened.
Absorb can't tell you why that day went wrong. It can tell you, in March rather than six months too late, which of those conditions you had runs behind and which you didn't.
What it is
What Absorb is
A fuelling memory and race planner for endurance and ultra runners. It records how each run went, one tap mid-run or two after, keeps the conditions the run happened in, and turns all of it into a course-specific plan, a console for your crew, and evidence that sharpens the next race.
It's not a nutrition app, a macro tracker, a training plan or a coach. It doesn't count calories, doesn't tell you what to eat, and doesn't pretend to know why anything happened.
It does build you a race plan. The difference is whose numbers are in it: yours, drawn from your own runs, placed onto the course at the stop where each one lands. Other tools tell you grams an hour. The grams were never the hard part.
Built by an ultra runner in the UK, and it works from the training you've already done.
Two pieces of background, useful whether or not you ever use Absorb: how many carbs an hour the research supports, and why grams an hour is the wrong unit for a race with stops in it.
What it does
Four things it does
The first is free and you'll use it every week. Two are what you pay for. The last is why you should believe any of it.
How it works
One tap mid-run, or two after. Your own pattern appears with its sample size, and when you're ready, you run a real test on yourself, citation attached.
02Race day
Paste the race URL, get the stop list. A finish range instead of a finish time, fuelling per aid station, reminders written into your GPX.
03Crew
Your crew get the same plan on their own phones. No account, nothing to install, and it still reads with no signal.
04Proof
We publish the races the engine missed, not just the ones it called. And why Absorb will never hand you a prescription.
The evidence gap
If you're a woman, the research wasn't written about you
We went through 937 studies on fuelling during exercise (Kuikman 2023, PubMed 36251373). About one in ten of the athletes in them were women, and not one tracked cycles closely enough to say what works for you. That's why the cycle space exists.
The first 100 members pay £79 a year and hold that price for as long as they stay. That's £40 less every year, not just the first.
Before you decide
Questions runners ask first
Which watch do I need?
Whichever one you already own. Absorb works from Strava, and Garmin, COROS, Suunto, Polar and Apple Watch all sync to it automatically. If your runs appear on Strava, Absorb can read them.
Direct watch connections aren't live yet. Everything Absorb needs is already in what Strava has.
Do I have to log every run?
No. Absorb only asks about runs long enough for fuelling to matter. You set that length yourself, and anything shorter is skipped without being counted against you.
Want to log a short one anyway? Open it and do so. A run that went fine takes two taps.
How long before Absorb tells me anything useful?
Something on your first logged run, something worth acting on after about five. From two runs in the same condition it will name what has coincided, and it says so in careful language, because two runs is two runs.
Below two runs it says nothing at all rather than guess.
What does Absorb cost?
The part you use every week is free, and it isn't a trial: logging, the pattern engine and your full racing record all cost nothing. You pay to plan a race: the course, the pacing, the per-stop fuelling, the GPX write-back and the crew console.
One race is £49, paid once, never expires. Every race is £119 a year. The first 100 members pay £79 a year and keep that price for as long as they stay. See the full breakdown.
Is Absorb a nutrition tracker, or a coach?
Neither. It's a memory and a calibration system. It doesn't count calories, build meal plans, tell you what to eat or write your week. It remembers what you did and what went with it.
It's meant to sit alongside a coach, or your own judgement, as a cross-check rather than an authority.
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For people aged 16 or over.