Stop tracking your stress.Start training it.
Your watch already tells you your HRV is low. ONDA guides your breathing and shows your heart rhythm respond in real time — so you can actually calm your nervous system, not just measure it. Works with your iPhone camera or an Apple Watch — no extra hardware needed.
No account. Free to start. Your first reading in 90 seconds.
[ THE PROBLEM ]
You've tried the apps. You have the watch. You still can't switch off.
Meditation apps feel nice but they're random — no feedback, no way to know if anything's working, so they don't stick. Trackers are the opposite problem: your ring tells you your HRV tanked and your stress is high, then leaves you to figure out what to do about it.
ONDA is the part in between. Guided breathing, with live feedback from your own heart — so you can see the number move while you practice, and watch your baseline trend up over weeks.
[ THE PRODUCT ]
Most apps score you after. ONDA shows you during.
See your body respond, in real time. Breathe along with the guidance and watch your heart rhythm smooth out as you go — the live feedback loop meditation always lacked.
[ HOW IT WORKS ]
Three steps. Five minutes.
Connect
Use your iPhone camera, or pair the Apple Watch you already own. No special hardware required.
Breathe
Follow a guided session, 5 to 30 minutes. ONDA guides your breathing and reads your heart in real time.
Watch it move
See your rhythm respond now, and your HRV baseline trend up over the weeks you keep practicing.
[ WHY ONDA ]
Not another meditation app. Not another tracker.
Structured, because it's sequential.
A real 8-level progression where each level builds on the last — not a shuffle of unrelated sessions. You always know the next step.
Training, not just tracking.
Whoop and Oura tell you you're stressed. ONDA helps you do something about it.
Honest, not anxiety-inducing.
Your trend matters more than one morning number. We won't gamify your panic.
Works on what you own.
Your iPhone camera or an Apple Watch — plus HRV from any tracker that syncs to Apple Health.
[ WHY TRUST IT ]
Trust, earned in under 90 seconds.
Built on resonance breathing and HRV biofeedback — with the research it rests on cited, in plain sight.
See the science →No account and no email before your first reading — free to start.
Co-developed with a neuroscience PhD advisor. · App Store reviews coming soon — we'd rather show real ones than fake them.
[ THE PATH ]
Where it goes: 8 levels.
ONDA isn't one exercise — it's a structured progression. You start by settling your nervous system, then build from there. Go as deep as you want, from steadying your baseline to the quietest states of long practice.
- BODY / TERRA
- EMOTIONS / AQUA
- MIND / AER
- SOCIETY / IGNIS
- BODY II / TERRA II
- BRAIN / AQUA II
- DNA / AER II
- ATOMIC / IGNIS II
BODY / TERRA
Breathing, diaphragm, and HRV — the foundation of parasympathetic activation.
EMOTIONS / AQUA
Working with stress and emotional reactivity — steadier responses when things get heavy.
MIND / AER
Attention and focus — training a calmer, clearer mind.
SOCIETY / IGNIS
Connection and social calm — showing up steadier around other people.
BODY II / TERRA II
Deeper embodiment — moving from thinking about the body to feeling it. Flow and ease in motion.
BRAIN / AQUA II
Self-awareness and metacognition — watching your own mind with more clarity.
DNA / AER II
Where the practice stops being something you do and becomes part of who you are. Months of consistency settling into a steadier baseline.
ATOMIC / IGNIS II
The deep, quiet states long-term practitioners describe — total presence, the self going still. Experiential, not measured. The edge of the map.
[ RECENT_LOG ]
latest →Caffeine's Overnight Signature: What the Afternoon Coffee Does to Your Heart
Caffeine has a 5–6 hour half-life, so the afternoon cup is still in your system at bedtime, where it can lighten your sleep, and sleep shapes overnight HRV. Whether caffeine moves HRV directly is still debated. It can also raise heart rate in some people, though its effect on resting heart rate is inconsistent and regular coffee drinkers build tolerance. Why the effect is deeply personal, and how to find your own caffeine cutoff from your own data.
Normal HRV by Age: What’s a Good Heart Rate Variability?
There’s no single good HRV number — it depends on age and your own baseline. Typical HRV ranges by age, why HRV drops as you get older, and why your trend matters more than any average.
Resting Heart Rate by Age: What’s Normal?
A normal resting heart rate is 60–100 bpm for adults, but the healthy range shifts with age and fitness. Typical resting heart rate ranges by age, what raises or lowers yours, and when it matters.
The Wanting Machine: What Dopamine Really Does — and the Myths About Resetting It
Dopamine drives wanting and learning, not pleasure. What the science shows about motivation, why "reset your baseline" claims overreach, and what really helps.
The Circadian Reset: Programming Your Biological System Clock
Circadian rhythm reset: master the photic signal and resync your hardware with the solar cycle. Fix Circadian Drift, insomnia, and chronic brain fog.
[ DEEP DIVES ]
Flagship Articles
Science-backed guides for nervous system optimization. From vagal tone to longevity hardware.
The Wanting Machine: What Dopamine Really Does — and the Myths About Resetting It
Dopamine drives wanting and learning, not pleasure. What the science shows about motivation, why "reset your baseline" claims overreach, and what really helps.
→
The Circadian Reset: Programming Your Biological System Clock
Circadian rhythm reset: master the photic signal and resync your hardware with the solar cycle. Fix Circadian Drift, insomnia, and chronic brain fog.
→
The Fuel Switch: What Metabolic Flexibility Really Is — and How to Tell If You Have It
Metabolic flexibility is your ability to shift between burning fat and carbs. How it is measured, why it is not ketosis, and which habits actually improve it.
→Start with one breath.
Free to start. No account. Your first reading in 90 seconds.
The world around you becomes how you see it inside yourself.