Overview
Seven pillars. One AI coach. A unified performance system built on the Greek principle of measure — μέτρον — and the belief that the systems used by professional athletes should be available to everyone.
Plan Engine
90 minutes, eight AI phases, one personalized plan. Training, nutrition, supplements, recovery, sleep, cardio, and body composition — all built from your actual data, with 15 to 25 custom rules tuned to your specific vulnerabilities.
Rebalancing Engine
Five tiers of adaptation, from daily to annual. Your plan adjusts overnight based on recovery, training load, sleep, and nutrition. No morning surveys. No “how do you feel today?” — the decision is made before your alarm goes off.
Arete AI Coach
The God of Performance at the center of your heptagon. Chat-first, with your full training history, real-time wearable data, and the ability to adjust anything you ask. Named for the Greek aretē — excellence as the fulfillment of purpose.
The Heptagram
The seven-pointed star at the heart of Metron. Sleep, Training, Nutrition, Recovery, Cardio, Body, Mind — each a pillar, each a guardian, each a score. At a glance, you see the shape of your excellence.
Integrations
Apple Health, Whoop, Oura, Garmin, Withings, Strava, and more. The wearables you already own become one intelligent system — not seven dashboards telling you seven different things.
Elite resources, for every athlete.
Metron is the sports scientist in your pocket — the systems professional athletes use, made accessible through AI. No team required. No $300 monthly coach required. Just you, your data, and the plan that adapts to it.
Endurance
For runners, cyclists, and triathletes. Metron reads your HRV and overnight recovery, then adjusts tomorrow’s intervals, threshold work, and taper. Catches recovery dips before you feel them.
Strength
For lifters, powerlifters, and bodybuilders. The correlation engine learns your body across weeks — like which lifts move 18% stronger after seven hours of sleep, or which sessions tank when protein drops below target.
General fitness
For busy lives and real training. One plan that accounts for the night your kid was up at 3 AM, the meeting that ate your lunch, and the fact that you still want to train four times a week.
Competitive
For teams, coaches, and sports programs. Shared dashboards, athlete-level plans, and cross-roster correlation analysis. Built for programs that need visibility across twenty athletes, not one.

“No coach I’ve ever worked with adjusted my taper week the way Metron did. It caught a recovery dip I hadn’t even noticed yet and cut my Tuesday session before I hurt myself.”

Sarah K. — 2:58 marathoner Read more athlete stories →
Platform +
Overview Plan Engine Rebalancing Engine Arete AI Coach The Heptagram Integrations
Athletes +
Endurance Strength General fitness Competitive
Compare FAQ Get the App

"It is a shame for a man to grow old without seeing the beauty and strength of which his body is capable."

Socrates, c. 400 BC

Performance, democratized.

For every athlete. At every level.

The problem

You're tracking everything. Nothing's talking.

You slept four hours. You ran ten miles yesterday. This morning your training app wants intervals. Your nutrition app has no idea you trained fasted. Your recovery score is red. Your coach app tells you to push.

Five apps. Five answers. Zero coordination.

The data exists. Nothing reads all of it.

There had to be a better way.

The solution

One coach. All your data. Every night.

Metron pulls your sleep, recovery, training, and nutrition into a single model — then rewrites tomorrow's plan while you sleep. No manual input. No conflicting advice. One plan, adapting to you, every morning.

Connects with everything you already use

Apple HealthApple Health
WhoopWhoop
OuraOura
GarminGarmin
FitbitFitbit
StravaStrava
TrainingPeaksTrainingPeaks
MyFitnessPalMyFitnessPal
Eight SleepEight Sleep
PelotonPeloton
FitbodFitbod
WithingsWithings
InstacartInstacart
GrubhubGrubhub
While you sleep

Metron is working.

11:47 PM Whoop logs recovery at 42%.
2:13 AM Apple Health confirms four hours of sleep.
4:30 AM Metron rewrites tomorrow: strength session becomes mobility, protein target drops 20g, cardio moves to Thursday.
7:00 AM Your plan is ready. You didn't do anything.

Three engines. One system.

01 Personalized Plan Engine

90 minutes. Eight AI phases. One plan covering training, nutrition, supplements, recovery, sleep, cardio, and body composition. Built from YOUR actual data.

  • Syncs your wearables before generating
  • Eight-phase build with adversarial self-critique
  • 15 to 25 custom rules for your vulnerabilities
Training plan progress
Arete AI recommendation
AI coach chat

From zero to your plan in one day.

01
15 minutes

Tell us about yourself

Complete a detailed questionnaire covering your body, goals, injuries, schedule, and preferences. This becomes the foundation of everything.

02
90 minutes

Metron builds your plan

72 workouts. Nutrition targets. Supplement stack. Recovery protocols. All integrated, all personalized, while you do something else.

03
Every night after

It never stops learning

Every night it reads your data and adjusts tomorrow. The longer you use it, the more precisely it knows exactly what you need.

The Metron Advantage

Metron Standard LLMs In-Person Trainers Generic Fitness Apps
Reads your wearable data ✓ ✕ ~ sometimes ~ limited
Adapts your plan daily ✓ automatically ✕ ~ manually ✕
Covers training + nutrition + recovery ✓ all 7 pillars ~ generic advice ~ training only ~ one pillar
Remembers your full history ✓ ✕ forgets each session ~ if they take notes ✕
Available 24/7 ✓ ✓ ✕ ✓
Cost Free (beta) $20/mo $100 to $300/mo $5 to $15/mo

Built for people who take training seriously.

"I've tried every fitness app out there. Metron is the first one that actually feels like it knows me. It adjusted my training the morning after a bad night of sleep before I even opened it."

James R. — Competitive powerlifter

"I've been marathon training for six years. No coach I've ever worked with adjusted my taper week the way Metron did — it caught a recovery dip I hadn't even noticed yet and cut my Tuesday session before I hurt myself."

Sarah K. — 2:58 marathoner

"I'm not a competitive athlete. I just want to train smart around a busy job and two kids. Metron is the first thing that actually accounts for the fact that I slept like garbage because the baby was up."

Marcus T. — Recreational lifter
Coming Soon

Stop Guessing.
Start Adapting.

Launching on the App Store. Be the first to know.

Download on the App Store Coming Soon

FAQs

A standard AI model can't see your data. Metron connects directly to your wearables and training logs, then analyzes your actual sleep, HRV, and workout history. When you ask "should I train today?", you get an answer based on YOUR recovery state, not generic advice.
It doesn't default to easy. When you're ready to push, it tells you to push harder. Last month, 23% of adjustments INCREASED intensity because users were under-training relative to their recovery. You can also override any adjustment.
That's plenty. Apple Watch tracks sleep, heart rate, and workouts. The system works with one device. More devices = richer insights, but one is enough to start.
Yes, currently iOS only. Android is on our roadmap. Sign up and we'll notify you when Android launches.
Yes. Your data is encrypted, never sold, and never shared with external AI models. You can export or delete everything at any time. We make money from subscriptions, not your data.
Metron provides insights based on your data, not medical advice. It's designed to help you understand patterns and make informed decisions. For injuries or medical concerns, always consult a healthcare professional.

"We are what we repeatedly do. Excellence, then, is not an act, but a habit."

— Aristotle