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Fitness
personalized to you.

Personalized fitness, powered by your metabolic data and goals.

Coach-guided No guesswork Real metabolism Breath-based Respyr coach holding the breath-powered metabolic device

Breath-powered metabolic intelligence

Your breath is more than air.

Breathe once. Respyr reads your metabolism in 60 seconds — the actual chemistry of how your body is fueling, recovering, and digesting today. Not steps. Not calories.

See how it works

Non-invasive · 60 seconds

No subscriptions

30-day risk-free

Decode your metabolism

Three biomarkers

One breath

Six metabolic scores

Non-invasive

60 seconds

Decode your metabolism

Three biomarkers

One breath

Six metabolic scores

Non-invasive

60 seconds

Why Respyr

Two people. Same diet. Different bodies.

For decades, health technology has only tracked the outside of you — steps, calories, heart rate. Your metabolism is more complex than movement alone.

Do everything right, get nothing back.

You follow the diet, sleep eight hours, hit the gym four times a week. The scale won't move and the energy crashes don't stop. Generic formulas don't know what's happening inside you.

Your metabolism changes daily.

Your metabolic state shifts continuously with sleep, stress, hydration, food timing, and recovery. A static calorie model can't capture that. A 60-second breath reading can.

Effort isn't the same as outcome.

Two people can follow the same diet, do the same workout, sleep the same hours — and still experience completely different internal results. The difference is in how the body is responding.

Breath as a new interface.

We built Respyr on one belief: three exhaled biomarkers reflect the real-time chemistry of how your body is fueling, recovering, and digesting — right now.

The Science

One exhale. Three windows into your metabolism.

Each biomarker maps to a metabolic dimension — fuel, recovery, and digestion — giving you a real-time picture no blood test can match.

01 · Acetone

Fuel Utilization Trend

Is your body burning glucose or fat right now? This score tracks how flexibly your metabolism switches fuel sources — the signal that tells you if your diet is actually working.

02 · Ethanol

Metabolic Load Trend

How hard your liver is working behind the scenes. This score reflects metabolic strain, detox load, and recovery state — the signal most health tools completely miss.

03 · Hydrogen

Digestive Activity Trend

What's happening in your gut after you eat. This score tracks microbial fermentation activity — revealing which foods your body digests well and which ones it struggles with.

Our product

Lab-grade sensors. Pocket-grade ritual.

Three independent semiconductor sensors — each tuned for one biomarker — inside a brushed aluminum body. Designed to feel calm and premium, not clinical. No needles. No patches. No fasting.

Three independent sensorsOne dedicated channel each for acetone, ethanol, and hydrogen
60-second readingFaster than brewing coffee. Sit still, breathe naturally, one controlled exhale.
Factory-calibrated for 5 yearsNo re-calibration. No consumables. No subscriptions.
iOS + AndroidUSB-C and Bluetooth 5.0. Syncs in under a second.

Your metabolic breakthrough is here

One calm breath. Three exhaled biomarkers. Six metabolic scores — in the time it takes to brew coffee.

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The Respyr breath-powered metabolic device

How it works

Decode your metabolism in four steps.

From breath to blueprint in 60 seconds. Designed to feel like a moment of calm — not a clinical procedure.

Guided Breath

Power on the device and open the app. The interface guides your inhale, hold, and exhale through calm visual cues.

Biomarker Capture

Three sensors capture acetone, ethanol, and hydrogen signals from your single exhale.

Intelligence Analysis

Biomarkers become trends and sub-scores. AI explains what your metabolism is actually doing.

Adaptive Lifestyle

Today's nutrition, training, and recovery — calibrated to today's actual metabolic state.

Ready to see real results?

Hear from coaches, athletes, and everyday users who took back control of their metabolism.

The Respyr app

All in one app.

Respyr app — Breath screen showing exhale ball tracker

Take your breath, and Respyr turns it into clear answers across metabolism, nutrition, and recovery — one plain-language verdict for today, plus the trends underneath. No charts to decode.

*Available for iOS and Android

Real users · real results

Reviews from our community.

★★★★★ ✓ Verified

Jordan M.

Wellness coach @LosAngeles

"I've been chasing fat loss for two years. Respyr is the first thing that actually told me when my body was burning fat vs glucose. Down 12 pounds in 8 weeks."

★★★★★ ✓ Verified

Sara K.

NASM Trainer @Austin

"I work with 15 clients a week. Respyr lets me see which clients are actually recovering and which are heading toward burnout — before they tell me."

★★★★★ ✓ Verified

Verified Respyr user

GLP-1 user @6mo

"I'm on semaglutide and most apps just gave me generic disclaimers. Respyr is the first one that actually adapts my nutrition."

★★★★★ ✓ Verified

Devin H.

Ultra-endurance athlete @Boulder

"HRV told me I was recovered. Respyr told me my metabolic load was actually still elevated. I held back one extra day before a 100-miler. PR'd by 22 minutes."

★★★★★ ✓ Verified

Marcus C.

Founder @Seattle

"I run a tech company and travel three weeks a month. Respyr is the only tool that keeps up with how chaotic my schedule is. 60 seconds in the morning."

★★★★★ ✓ Verified

Verified Respyr user

Biohacker @HealthStack

"I have Whoop, Oura, and a CGM. Respyr gives me the one signal none of those captured — direct fat vs carb burn, in real time. Best $299 I've spent."

FAQ

Have Questions?

Learn how Respyr works, how breath analysis reveals metabolic insights, and how you can use it to improve your health.

What is Respyr?
Respyr is a breath-powered metabolic intelligence platform. It analyzes three exhaled biomarkers — acetone, ethanol, and hydrogen — to reveal six metabolic trends covering how your body is fueling, recovering, and digesting in real time. It's a lifestyle tool, not a medical or diagnostic device.
Who is Respyr for?
Adults who want to understand and optimize their lifestyle. Especially useful for: fitness-focused users, endurance athletes, trainers and coaches, lifestyle-conscious individuals, users on GLP-1 medications, and biohackers who want a new layer of metabolic signal.
How is this different from a CGM or Whoop?
CGMs read glucose. Whoop and Oura read heart variability. All useful, all measuring one dimension. Respyr reads three independent biomarkers in one breath and resolves them into six precise sub-scores. And you don't wear it 24/7 — it's a calm 60-second daily ritual.
Do I need to fast before a reading?
No. Respyr reads your metabolism in its current state. The app auto-detects time of day and adjusts interpretation accordingly. You can take a reading anytime.
Will it work for someone on GLP-1 medications?
Yes. Respyr includes a dedicated GLP-1 adaptive mode. When you indicate you're on semaglutide-class medication, the app adapts your daily guidance — smaller portions, protein-first sequencing, hydration windows, and gentler training recommendations on low-tolerance days.
When does it ship?
Pre-orders ship from Q3 2026, prioritized by reservation order. You're not charged until your unit ships, and you can cancel anytime before shipment.
Is my data private?
Yes. Readings are stored end-to-end encrypted. We never sell your data and don't share it with insurers, employers, or advertisers. You can export or delete everything at any time.
What if I'm not satisfied?
30-day risk-free return. Full refund if Respyr isn't working for you. We cover the return shipping.

Ready when you are

Your breath is more than air.Start reading what it means.

Reserve your Respyr today. Free US shipping. 30-day risk-free returns. No payment until your unit ships.

Fitness
personalized to you.

Your breath is more than air.