100 places · Wave 1: 25 athletes · Applications close when full · April 2026 calibration window
COHORT 001 · TestFlight Access

The only nutrition system that holds your full biological context.

Train, recover and race without guessing — by holding your sleep, training, composition and pantry in one engine, with peer-reviewed physiology, wearable integration and meals built from the food already in your kitchen.

Apply for Cohort 001 See a real Day 0 plan
Free to join · No credit card · Beta access 8 weeks via TestFlight · iPhone 16+ · iOS 18+
KEXBI dashboard — deload session with chrono timer
Six of sixteen peer-reviewed calculators running under every Cohort 001 plan
Energy baseline
Katch-McArdle BMR
370 + 21.6 × LBM
Indexed to lean mass, not scale weight. Mifflin-St Jeor fallback when body-fat % is unknown.
McArdle & Katch, 1983
Metabolic floor
30 kcal / kg FFM
Under-fuelling safety floor
The energy-availability threshold below which recovery, hormones and bone density all drop.
Loucks 2004 · IOC 2023
Performance protein
2.2 g / kg
Distributed, not a daily total
Four leucine-triggered pulses across the day, 2.5–3 g leucine each.
Morton BJSM 2018 · Moore 2009
Post-workout fluid
150% of fluid lost
2-hour rehydration window
Replaces what was lost during the session, tapered overnight to protect sleep.
Sawka ACSM 2007 · Maughan 2016
Intra-workout fuel
30–90 g CHO / h
Carbohydrate ladder
Scaled to session length and each athlete's gut-absorption ceiling.
Jeukendrup, Sports Med 2014
Circadian fuelling
Morning-loaded
Chrononutrition, not static totals
Calories weighted earlier in the day; pre-sleep casein extends MPS overnight.
Jakubowicz 2013 · Res 2012
Ten more calculators (anabolic-age bump, carb periodisation, LBM-hydration, Beverage Hydration Index, sleep-protected fluid taper, glycogen window, weight-trend variance guard, MET-based AEE, gut-absorption ceiling, Boer LBM fallback) run under the surface. The engine shows you only what changes your plan today.
The filter

Cohort 001 is not for everyone. On purpose.

KEXBI is a selection mechanism, not a signup form. If the engine is going to earn its calibration data from you, it needs to be pointed at athletes the product was actually built for.

This is built for you if

  • Scene-set
  • →You've questioned your fuelling at least once in the last seven days.
  • The wearable gap · Whoop / Oura / Garmin
  • →Your wearable flags low HRV — and nothing in your stack adjusts today's fuel.
  • →You know your sleep score before you know your breakfast.
  • The tracking gap · MyFitnessPal
  • →You've hit your macros and still bonked — and you want to know why.
  • →You want protein, carbs and fluids tuned to today's session, not yesterday's average.
  • The adjustment gap · MacroFactor
  • →You've used a macro adjuster and wondered why it never saw your training load.
  • →You want every number your app gives you to come with a reason.
  • The commitment
  • →You'll connect your wearable on day one and train 4–6 days a week.
  • The insight
  • →You don't need another dashboard. You need a decision.

This is not for you if

  • Calorie counter · MyFitnessPal loyalist
  • ×You want a calorie database and a barcode scanner, not a thinking engine.
  • ×You measure success by how many days you logged in a row.
  • Weight-loss algorithm · MacroFactor user
  • ×Your primary goal is a number on a scale.
  • ×You want an algorithm that adjusts from weight trend alone.
  • Dashboard collector · Wearable enthusiast
  • ×You collect readiness scores but never change behaviour around them.
  • ×You want another dashboard to look at, not a decision to act on.
  • Prescriptive eater
  • ×You want a rigid meal plan, not an engine that adapts to your week.
  • Wrong mindset
  • ×You believe "listen to your body" is a complete nutrition strategy.
  • ×You expect instant results without adherence.
  • ×You're not willing to share pantry data and a wearable signal.
The problem

Wearables measure you. Food logs track you. Neither does sports nutrition.

Your Whoop knows your recovery. Your MyFitnessPal knows your calories. Your MacroFactor knows your weight trend. None of them know how today's session should be fuelled — because none of them hold the signal together.

A sports nutrition engine isn't a logger with more fields. It's a system that sees sleep, training load, composition and pantry in one place and makes a decision you can act on in the next three hours. That category is open. Nobody occupies it.

KEXBI meal — seared chicken with macro breakdown and coaching note
Beyond the daily total

A calorie is not a calorie at 6am and 10pm.

Every macro tracker gives you a daily number. KEXBI gives you a timeline. Morning-loaded calories, protein distributed in four leucine-triggered pulses, carbohydrate periodised to the session in front of you, and pre-sleep casein that extends muscle protein synthesis through the night. That's chrononutrition. It's the difference between a spreadsheet that resets at midnight and a plan that moves through your day.

2.5×
more weight loss from morning-loaded calories vs. evening-loaded — same total intake.
Jakubowicz et al., Obesity 2013
4 pulses
protein distributed across the day — every 3–4h — to trigger MPS at each meal.
Moore 2009 · Areta J Physiol 2013
22%
overnight muscle protein synthesis gain from a pre-sleep casein feed during training blocks.
Res et al., MSSE 2012
30–90 g / h
intra-workout carbohydrate ladder, scaled to session length and gut tolerance.
Jeukendrup, Sports Med 2014

MyFitnessPal gives you a daily target. MacroFactor gives you a weekly adjustment. KEXBI gives you a morning, a mid-session, an evening and a pre-sleep plan — because the research says the timing is half the outcome.

The engine

What happens when one system holds everything.

These aren't features. They're consequences of holding full context. No other product can ship them because no other product sees the same inputs.

KEXBI journal — trail run with pre-run and intra-run hydration
Sleep drops — today's carbs shift forward, your session gets resized.
REQUIRES sleep stages · HRV · this morning's session · recovery window
Heavy lift yesterday — protein target rises, scale bump gets explained before you panic.
REQUIRES training load · lean mass · 48h water dynamics · scale delta
Missed lunch — deficit recalculated, Fresh Start Policy applied, plan not inflated.
REQUIRES intake log · weekly targets · pantry state · time-to-next-meal
Race in nine days — ten-day carb load already in progress, gels already sequenced.
REQUIRES event date · distance · body mass · weather forecast · gel database
Three poor sleeps in a row — training adjusts before you drift into metabolic under-fuelling.
REQUIRES lean mass · FFM floor math · HRV trend · blueprint library
The team

The plan you see is consensus from 22 specialists.

A sleep scientist, a hydration lead, a registered dietitian, a readiness coach, an energy-availability sentinel, a supplement specialist, a performance coach — plus fifteen more running support roles. You see the answer. They do the arguing.

Sleep & circadian specialist

Reads sleep stages and HRV, decides when carbs land and when your session gets resized.

Metabolic mathematician

Holds the Katch-McArdle math, sets your energy floor from lean mass — not body weight.

Registered dietitian

Audits every meal against daily protein, carb, fat and micronutrient targets before it reaches you.

Readiness coach

Watches training load and recovery, adjusts session intensity before you over-reach.

Energy-availability sentinel

Silent guardrail. Flags under-fuelling at 30 kcal/kg FFM — before it becomes a pattern.

Hydration lead

Owns 150% fluid replacement inside a 2h post-session window. Sodium, timing, volume.

Supplement specialist

Screens your stack for interactions, redundancy, and evidence grade. Quiet when it's clean.

Performance coach

Turns the consensus into one line you actually read. No jargon. No feature names.

Fourteen more specialists run support roles — meal prep, shopping logistics, food-data enrichment, narrative translation, weekly periodisation, and Kira, your conversational coach. Your brief lands without the noise.

A team of 22. A single decision. Silent by default.

Connects with
Garmin
Whoop
Oura
Works with Apple Health
The cost of guessing

What undershooting actually costs.

Every athlete training without full context pays one of these prices. Most don't know they're paying it.

300 kcal under on a high-load week

Recovery capacity drops. The next block compounds the deficit. Most athletes interpret the fatigue as "I'm not training hard enough."

Protein targets missed across a block

Lean mass loss compounds quietly. Scale looks flat. Body composition regresses. Most apps never notice because they don't index on FFM.

Race-day fuelling by feel

Under-fuelled at 90 minutes. Carb window missed. Pace drops 12%. Four months of training resolves into a PR that didn't happen.

Silent under-fuelling drift

No logging app can detect it — because none hold the lean-mass math to set your floor in the first place. KEXBI is structurally the only consumer product that can.

Day 0

See your plan before you apply.

Three inputs. A real calculation. This is the same engine every Cohort 001 athlete sees in their first five minutes after onboarding — minus the pantry scan.

Live calculation

Your Day 0 snapshot

Lean body mass—
Calculated from weight × (1 − body fat %).
Katch-McArdle BMR—
370 + (21.6 × LBM kg). Lean-mass-indexed. More accurate than Mifflin-St Jeor for trained athletes.
Today's estimated TDEE—
BMR × activity factor based on your weekly training load.
Under-fuelling floor (do not cross)—
30 kcal/kg FFM. Hard safety floor. Peer-reviewed (Loucks 2004 · IOC 2023).
Macro anchor — protein / day—
1.8 g/kg bodyweight. Your starting anchor. KEXBI will adjust inside the cohort.
This is a read-only preview. Cohort 001 adds: pantry-aware meals, wearable signal, adaptive blueprint, event ramping, explanation layer, and Blind Spot diagnostics.
Why I built this

25.5 stone. A midnight impulse. And seven years before the tech caught up.

At 38, I was 25.5 stone with a pack-a-day habit and two young boys I needed to be around for. One night I entered a local 10k on impulse. I didn't own trainers. I didn't know what a macro was. The next day I quit smoking and bought a pair of shoes — not even running shoes, just something to move in. Those early runs were in the dark, head-to-toe in black, because I was too embarrassed to be seen.

The weight came off. Then a different ceiling hit. As the distances grew — 26 marathons, 10 ultramarathons — I became data-rich but insight-poor. I had the heart to run 100 miles but I didn't have the fuel. I was staring at heart rate and sleep scores and none of it told me what to eat to make the next mile possible. I spent seven years trying to build an app that could solve this, but the technology wasn't there — deterministic code couldn't handle the context of a human life. Then the AI landscape changed, and we could finally build a system that actually sees the person behind the device.

I'm 50 now. I'm training for Venice Marathon this October while recomposing 4 kg of fat in the same block. The 22-specialist engine in this product has been fuelling me since January — every blueprint, every calculation, every adaptation has run against my own biology first. If it didn't work on me, it never shipped to Cohort 001. I didn't have the money for a private nutritionist when I was starting out, so I built one that lives in your pocket.

The engine is already running. What I need now is 100 athletes whose biology is different enough from mine to stress-test it against long blocks, poor sleep, travel, and the weeks that don't go to plan.

— Ben, Founder
Why Cohort 001

100 athletes. Eight weeks. One calibration phase.

Cohort 001 is not early access. It's where the engine is stress-tested against real training blocks, real sleep disruption, real travel, and real inconsistency.

In return for 8 weeks free via TestFlight, we ask three things of every Cohort 001 athlete:

The exchange

  • Connect your wearable on day one.
  • Let the engine observe your real-world behaviour — including the weeks that go sideways.
  • Flag anything that doesn't make sense to you. The engine calibrates on your scepticism, not on your praise.

When beta closes, Cohort 001 keeps:

  • All your plans, your history, and your diagnostics.
  • A founder price of £14.99/month for life — one tier below what the public pays.
  • Priority on Cohort 002 invitations for athletes you recommend.
What Cohort 001 won't see

We shipped silence on purpose.

No streaks. No daily nudges. No social feed. No gamification. No "you smashed it today." When your biology is quiet, KEXBI is quiet. If that feels strange for the first week, the product is working as designed.

The questions

Seven questions KEXBI answers that nothing else in your stack can.

Every one of these requires sleep data, training data, intake data, composition data and pantry data held in the same place. That's the only position from which they can be answered honestly. It's also the only position no competitor currently occupies.

Plan · Cook · Shop · Eat

From weekly prep to shopping list — already done.

KEXBI doesn't stop at macros. It builds your prep sessions, sequences the cooking steps, and generates a shopping list pinned to the meals in your plan. You open the app and start cooking.

KEXBI weekly prep — 10 meals, 2 sessions, 3 hours
Weekly prep overview
KEXBI Tuesday Big Cook — 4 meals, 11 cooking steps
Guided cooking session
KEXBI shopping list — categorised, costed, shareable
Auto-generated shopping list
If Wave 1 fills first

You still leave with something.

Wave 1 takes 25 athletes. If it fills before we review yours, or if your fit lines up better with Wave 2 (75 places), you'll receive three things automatically:

  • A calibrated Day 0 plan as a PDF — your BMR, your under-fuelling floor, your macro anchor.
  • A reserved slot for Wave 2 at founder pricing (£14.99/month instead of £24.99 at public launch).
  • The founder's blueprint — the same one I'm running myself for Venice.

Nobody leaves with nothing.

Apply for Cohort 001

Eight fields. Ninety seconds.

These answers help us calibrate your onboarding track and decide which blueprint to start you on. They also tell us whether Cohort 001 is genuinely the right place for you.

KEXBI ships via TestFlight — iPhone 16+ on iOS 18 or later required for the beta.
Free to join · No credit card · Beta access 8 weeks via TestFlight
By applying you agree to our Privacy Policy and Terms of Service.
Application received

You're in the queue.

We'll review applications in score order and get back to you within 48 hours. While you wait — help us surface athletes who'd fit Cohort 001.

Queue position
—

Your referral link

Athletes who apply with your link get priority on Wave 2. You get credit on Cohort 002.

Questions? Good.

What do I need?

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iPhone 16 or later running iOS 18+, and a compatible wearable — Apple Watch, Oura Ring, Garmin, or Whoop. Connects via Apple HealthKit.

Is the beta free?

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Yes. Completely free for 8 weeks via TestFlight. No credit card. Early supporters get preferential pricing at launch (£14.99/month for life instead of £24.99).

What data do you collect?

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Only what's needed for your protocol: wearable metrics (sleep, HRV, training load), onboarding preferences, and pantry data. We never sell your data.

How is this different from MyFitnessPal?

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MyFitnessPal is a manual logging tool. KEXBI is autonomous — 22 specialists read your wearable, build your meals from your pantry, and adjust your plan in real time. You don't track anything.

Will it work for my dietary needs?

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KEXBI supports a wide range of dietary frameworks captured during onboarding — vegetarian, vegan, halal, gluten-free, and more. Protocols are built around your constraints.

How accurate is the advice?

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Safety-critical calculations are deterministic and evidence-based — peer-reviewed formulas, not AI guesses. AI is used only for creative synthesis: meal assembly, coaching narratives, naming dishes.

What happens after the 8-week beta?

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Wave 1 athletes get founder pricing (£14.99/month instead of £24.99 at public launch) and priority access to every future release. No obligation to continue.