The world’s smartest
fitness coach.
CARBYNE is a health and fitness app built around KADE, a coach that is with you all day. KADE reads the research, learns your body and your routine, and edits your plan. Every answer shows its evidence grade.
Worked exampleOne question. Five steps.Follow how KADE reasons about your stalled bench press.
It starts with you, not the internet.
KADE pulls your last eight bench sessions, your sleep, food logs, soreness, and body weight. It sees that you bench Monday and Wednesday, 44 hours apart, and that you average 112 g of protein a day.
It keeps only studies that match you.
KADE searches the library for pressing plateaus in lifters of your age and experience. When a paper is openly available, it reads the full text, not just the abstract, so it can check who was studied and what they actually did. It drops studies of beginners and elite athletes, and ranks the rest by evidence tier.
Three independent lines of reasoning.
Training, food, and recovery are each analyzed on their own. No line sees another's conclusion, so one bad idea cannot spread to the rest.
It shows where the lines agree, and where they do not.
Two lines point to the same fix. One finds nothing. KADE reports the split instead of hiding it, and lowers its confidence to match.
An answer, and a plan that already changed.
Your bench moves to Monday and Thursday. 38 g of protein is added to your dinner. Your next rep goal is set. You approve or undo each change.
Why not just ask a general AI chatbot?
General AI chatbots are built to answer anyone about anything. KADE is built to coach one person: you.
Evidence30M+ records, in every language.Every record is graded before KADE uses it. Five linked studies show the standard.
1 · What goes in
Eight kinds of sources, every language.
- Peer-reviewed studiesT1 to T3
- Position stands & guidelinesT1
- Trial registriesT2
- Textbooks & booksT3
- PreprintsT3 to T4
- Coach & expert talksT4
- Community discussionT5
- Every languagetier-matched
2 · Every record is graded
Hover a grade to see which sources feed it.
3 · One graded library
- Updated daily
- Finds what it does not know yet
- Cited by tier in every KADE answer
4 · Every answer cites its grade
KADE names the evidence tier in every reply, so you know how strong the science is behind each recommendation. When the evidence is weak or mixed, it tells you.
The T1 to T5 scale is our own, inspired by GRADE-style certainty ratings.
Text version: studies, guidelines, books, talks and discussion go in. Each record gets a tier from T1 (strongest) to T5 (weakest, kept out of answers). The graded library of 30M+ records feeds every KADE answer, which cites its tier.
Claims you can check.
Each line below links to the paper. This is the standard every KADE answer is held to.
Position stand
Meta-analysis, 49 trials, 1,863 people
Dose-response meta-analysis, 15 studies
Randomized trial, 4 weeks
Meta-analysis, 69 studies
Security and privacyYour health data is yours.Private by default, never sold, and deleted by you.
Private by default
Health readings from your phone and wearables sync to your account only after you turn on health data consent, and you can turn it off at any time. Your data is encrypted in transit and at rest, and row-level rules mean only your account can read it.
No ads. No data brokers.
We do not sell your data or use it for advertising. Helping improve CARBYNE with your data is your choice, and you can turn it off in Settings at any time.
Delete it yourself, any time
In Settings, tap Export Data to download everything, or Delete Account & Data to remove your account and all of it. No email needed.
Medical disclaimer. CARBYNE gives educational coaching guidance. It is not medical advice and does not diagnose or treat conditions. Talk to a qualified professional about injuries, medications, or health concerns.
A day with KADEIt fits around your life, not just your workouts.KADE learns your schedule, sleep, and habits. It adapts your plan to your day, and helps you improve the day itself.
You wake up. The plan has already changed.
KADE read last night's sleep, your resting heart rate, and yesterday's soreness before you opened the app. It knows you train at 5:30 PM today, and plans that session around how you slept.
You slept 5h 02m. Legs today are cut to 6 working sets.
- Squat 3×5 → 2×5, same weight
- Leg press 3×10 → 2×10
Sleeping 6 hours or less cuts performance by about 7.6% on average, and the drop is largest in afternoon and evening sessions (Craven et al. 2022, 69 studies). Keeping the weight holds the strength stimulus. Fewer sets cut fatigue you cannot recover from tonight. The lost volume returns later in the week.
You ask a question between sets. It answers in one breath.
Speak to KADE with your hands full. It answers aloud and logs the set for you.
That was 5 clean reps. Add 5 lb next week.
- Squat 2×5 @ 225 saved
- Next session: 230 lb
You hit every rep at your target effort, so you are ready for more load. Small, steady increases are how strength keeps climbing without stalling.
You close the day. KADE fixes tomorrow.
It reads dinner, protein, and sleep target, then sets up tomorrow so you do not have to think about it.
You are 31 g short on protein. A shake before bed closes it.
- Bedtime reminder set for 10:30 PM
- Breakfast adds 20 g protein
Protein adds muscle up to about 1.6 g per kg of body weight a day (Morton et al. 2018, 49 trials). Closing today's gap keeps you at that target.
Sleep, food, recoveryResults are made when you are not in the gym.KADE learns from your whole day, not just your workouts.
Results are made when you are not in the gym.
KADE learns from all 24 hours of your day, not just the time you train. With your permission, your sleep, meals, and stress shape your plan.
- 01Sleep sets your volume. Short night, shorter session. Good night, extra set.
- 02Food is logged in seconds. Say what you ate. KADE does the math and fills the gap.
- 03Weekly insights. Each week, you see what worked for your body, measured from your results.
One connected systemTraining, food, gym, and body.One coach across plans, groceries, your real gym, and your wearables.
A plan for anyone
Training and nutrition plans for any age, goal, and starting point. Every number is derived, not copied from a template.
Your real grocery store
Meals built from what your store has in stock this week, with the list ready to order.
Your real gym
Film your gym once. KADE maps the equipment and builds sessions around what you actually have.
Built into your wearables
KADE works with your watch and other wearables to make logging close to effortless. It recognizes your sets and reps from how you move and logs them for you, so you train instead of tapping a screen.
Biology, not just reps
Understanding that runs from molecules to cells to whole systems, and ties each layer to how you train.
Every language
Sources and answers across languages and countries, so good science is not limited to English.
Get your first KADE answer.
What's your goal?
How long have you trained?
What is hardest for you right now?
Here is what KADE would start with.
Jon Marriott
I grew up as a competitive athlete: ten years of gymnastics, then competitive bodybuilding from age 16. Fitness has always been my life, and so has the frustration. Accurate fitness content is scattered and unverified, and very little of it helps you actually advance.
So I built CARBYNE. It pairs a growing library of real exercise videos with KADE, a coach that reasons from graded research and human biology and learns as much about you as you choose to share, from bloodwork to wearable data. KADE never judges. Whatever your starting point, you can tell it the truth, including supplements and peptides, and it works from your real picture. It watches your health trends and shows where your metrics are heading, so you can act early. Built-in privacy keeps your data yours.
I am an NASM-certified coach, and I am building CARBYNE to make evidence-based health and fitness simple for everyone, from first-time lifters to elite athletes.
Questions people ask first.
What is CARBYNE?
A health and fitness app built around KADE, an AI coach and daily companion. KADE answers from a large, graded library of sports science and health research, and adapts your training, nutrition, sleep, and recovery to you. It works by voice or text.
Is this medical advice?
No. CARBYNE gives educational coaching guidance. It does not diagnose or treat conditions. Talk to a qualified professional about injuries, medications, or health concerns.
Where does the evidence come from?
Peer-reviewed studies, textbooks, position stands, and expert sources in many languages. Each is graded by the strength of its evidence before the coach relies on it.
How do I get access?
Join the waitlist above with your name and email. The founder emails TestFlight invites to a few people at a time. A public App Store release is planned.
What happens to my data?
It is encrypted, never sold, and never used for ads. Health readings sync only after you give health data consent. You can export or delete everything yourself in Settings at any time.