Physiological Sigh
Stanford's fastest measured stress reset. Two short inhales through the nose, one long exhale through the mouth. Drops sympathetic activation in under 60 seconds.
For panic attacks. For 3 AM. For right now.
Calm a panic attack in 60 seconds.
Coheran is the breathing app for the moments your nervous system needs help right now — before a meeting, mid panic attack, lying awake at 3 AM. One‑tap SOS, always free. Twelve techniques backed by clinical research. Heart‑rate biofeedback through your phone camera. Free to download. Works offline. No signup.
- No signup
- No ads
- No tracking
- Works offline
500+
Installs in the first weeks
12
Science‑backed techniques
60s
Average time to first calm
0
Trackers, ads, or signups
Most "wellness" apps weren't built for the moment you actually need them.
When panic hits, you don't have twenty minutes for a guided meditation. You can't navigate four sub‑menus. You can't listen to a wellness coach lecture you about being kind to yourself. You need something fast, physical, and one tap away.
That's why we built Coheran around a single question: what do you need in the next 60 seconds?
Why Coheran is different
Every feature exists for one reason: to get you back to baseline as quickly as possible — and keep you there.
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One‑tap SOS panic button
Right on the home screen. No mood check‑in, no setup, no tutorial. One tap launches an immediate calming session — for the airport, the elevator, the boardroom, or 3 AM.
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See your heart rate drop in real time
Place your finger on the rear camera. Coheran measures your pulse with PPG — the same principle as an Apple Watch — and shows you the exact drop after each session. Honest biofeedback, not vibes.
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12 techniques, every method backed by research
Physiological Sigh, 4‑7‑8, Box Breathing, Wim Hof, Coherent Breathing, and more. Each technique opens with a 30‑second "Why this works" card explaining what's happening to your nervous system.
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Works fully offline
On a plane. In the subway. In a basement gym. The whole library is on‑device — your nervous system shouldn't wait for a 5G signal.
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No signup. No tracking. No ads. Ever.
Open the app and start breathing — no email, no account, no analytics SDKs. Heart‑rate data stays on your device by default. Optional encrypted backup if you want it.
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Guided voice or fully silent
Three voice options — Calm, Warm, Bright — guide your inhale, hold and exhale. Prefer silence? Switch to haptic‑only mode and Coheran guides you with gentle vibrations.
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Flow Mode for deep work
25, 50 or 90‑minute sessions: prime your nervous system, lock in for the focus block, then decompress. Pick a soundscape (Quiet Cafe, Forest, Warm Pad), set an intent, go.
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Personalized recommendations
Tell Coheran how you feel — energy, stress, focus, anxiety — and it picks the perfect technique for the next 90 seconds. No quiz fatigue, no thinking required.
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Streaks that forgive
Build a daily habit without the guilt. Earn a streak freeze each week (capped at three) that auto‑applies when you miss a day. Habit‑forming, not punishing.
A tour, screen by screen
Designed for the panicked, the sleep‑deprived, and the focused — sometimes all in the same day.
Calm in 60 seconds
The home screen does the thinking for you. The big red SOS launches an immediate calming session. Flow primes you for deep work. Programs guides longer journeys. Quick‑start chips for Calm, Energy, Focus and Sleep give you a one‑tap path no matter how you feel.
- Daily goal ring at the top
- Streak and trophy at a glance
- Recent sessions resumed in one tap
Tell us how you feel
Drag four sliders — Energy, Stress, Focus, Anxiety — and Coheran's recommendation engine picks the perfect technique. Optional camera‑based heart‑rate measurement (PRO) gives you a before‑and‑after comparison.
- Quick mood mode for one‑tap check‑ins
- No 12‑question quiz, ever
- Guides the SOS button when you can't think
12 real techniques. No meditation lectures.
Box Breathing. 4‑7‑8. Physiological Sigh. Wim Hof. Coherent Breathing. Each technique tells you the cycle pattern, expected duration, and difficulty before you start. Favorite the ones that work for you.
- Filter by Calm, Energy, Focus, Sleep, SOS
- "Why this works" card for every method
- 2 techniques free (Box Breathing & 3‑3‑3 Starter); Premium unlocks the other 10
Deep work, primed.
Flow Mode pairs a focus block with breath‑guided priming and decompression. Pick 25, 50 or 90 minutes, choose a soundscape, set an intent. Coheran handles the rest — Coherent Breathing to start, ambient loop during, Extended Exhale to land.
- Free: one 25‑minute silent flow per week
- Premium: unlimited 25/50/90‑min sessions, all soundscapes (Brown Noise, Rain, Lo‑Fi, Quiet Cafe, Forest, Warm Pad)
- Intent line so you remember what you sat down for
See your stress drop
Every session ends with an honest "after" screen: which mood metrics changed, by how much. No vague green checkmarks — just numbers.
- Free: stress, anxiety and energy delta after each session
- Premium: heart‑rate before/after via the phone camera (PPG)
- One‑tap "Done" — no forced upsell wall after a session
Your nervous system, charted
Mood trends over the last 14 check‑ins. Weekly rhythm. Average session impact. Most‑used techniques. All on your device, always — no cloud required.
- Stress, anxiety, energy, focus over time
- Sessions by day of week
- Most effective techniques for you
Habits that forgive
A 12‑month activity calendar (the kind you've seen on GitHub, but for your nervous system). Daily streak counter. Weekly streak freezes that auto‑apply when life gets in the way. Build the habit without the shame.
- 12‑month contribution‑style heatmap
- Weekly freezes (capped at 3)
- Sessions, minutes, streak — at a glance
Watch how it works
Open the app, pick a technique, breathe along. That's the whole product.
12 breathing techniques. Every one backed by clinical research or established practice.
Tap any technique below to see what it does, what it's good for, and how long the session takes inside the app.
4‑7‑8 Relaxing Breath
Andrew Weil's "natural tranquilizer for the nervous system." Inhale 4, hold 7, exhale 8. Clinically used for falling asleep faster and pre‑flight nerves.
Extended Exhale
The exhale‑longer‑than‑inhale pattern that physically slows your heart rate. The science behind every "long sigh" you've ever felt good after.
3‑3‑3 Starter
The gentlest entry point in the app. Three‑count inhale, three‑count hold, three‑count exhale. Designed for first‑time users and kids.
Box Breathing (4‑4‑4‑4)
The pre‑mission protocol used by Navy SEALs. Equal counts on inhale, hold, exhale, hold. The workhorse of structured calm.
Wim Hof Power Breath
Rapid breathing followed by retention. Used for energy, immunity, and cold exposure preparation. Coheran guides the cycles and the holds.
Coherent Breathing
The gold standard for heart‑rate variability training. ~5 breaths per minute, equal inhale and exhale. Used in clinical HRV biofeedback for years.
Energizing Breath
Rapid rhythmic breathing to wake up the sympathetic nervous system without spiking cortisol. A short, clean energy lift in the morning.
Triangle Focus
Three‑sided pattern — inhale, hold, exhale — that primes attention. Pair with Flow Mode for the cleanest start to a focus block.
Alternate Nostril (Nadi Shodhana)
The traditional yogic technique for nervous‑system balance. Coheran's voice guides which nostril to close, on the beat.
Ujjayi Ocean Breath
The slow, audible "ocean" breath used in yoga and pranayama. A grounding rhythm with a calming sound that doubles as a focus anchor.
Sleep Descent
A slow, descending‑pace ramp into deep relaxation — designed to be the last thing you do before lights out. Pairs with the silent haptic mode.
Multi‑day programs that build the habit
Pick a goal. Coheran chooses the technique for each day, scales the cycle count over time, and graduates you when you're ready.
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7‑Day Calm Starter
Build a daily breathing habit with gentle techniques. From 3‑3‑3 to Coherent Breathing. The on‑ramp.
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14‑Day Sleep Better
Two weeks of relaxation breathing — Extended Exhale, Ujjayi, 4‑7‑8 — leading to a full Sleep Descent practice.
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10‑Day Anxiety Relief
From grounding basics to the Physiological Sigh. By day 10 you have a personal toolkit for the next anxiety wave.
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7‑Day Deep Work Starter
Use breathing to prime focus. Coherent Breathing, Box, Triangle Focus. Pairs with Flow Mode.
Privacy‑first by design
What stays on your phone, stays on your phone.
You shouldn't have to trade your nervous‑system data for a calmer one. Coheran is built so the most private moments of your day stay private.
- No account required. Open the app and start.
- No tracking SDKs. No third‑party analytics in your sessions.
- Heart‑rate data stays local on your device by default.
- Optional encrypted cloud backup — only if you opt in.
- No ads, ever. No interruptions before, during, or after a session.
- Data is encrypted in transit. You can request deletion anytime.
Free to download. Premium to go deep.
We didn't paywall the panic button. We never will. Everything else is on the table — honestly.
Free
$0 no signup, no card
- One‑tap SOS panic button — always free
- 2 breathing techniques: Box Breathing (4‑4‑4‑4) and 3‑3‑3 Starter
- 1 grounding mini‑game for panic moments (Order Numbers)
- Flow Mode: one 25‑minute silent block per week
- Mood check‑ins (basic sliders)
- Daily streaks with weekly forgiveness freezes
- Voice and silent haptic guidance
- Insights: streak, sessions, minutes, 12‑month activity calendar
- Works fully offline · No signup · No tracking · No ads
Coheran Premium
Subscription or one‑time lifetime
- All 12 breathing techniques — Physiological Sigh, 4‑7‑8, Wim Hof, Coherent, Energizing, Alternate Nostril, Extended Exhale, Ocean Breath, Triangle Focus, Sleep Descent (plus the 2 free)
- All 8 grounding games for panic moments (Catch Circle, Trace the Path, Memory Echo and more)
- Flow Mode unlimited: 25 / 50 / 90 min, all soundscapes (Brown Noise, Rain, Lo‑Fi, Quiet Cafe, Forest, Warm Pad)
- Heart‑rate biofeedback via phone camera before & after every session (PPG)
- Multi‑day guided programs: 7‑Day Calm, 14‑Day Sleep, 10‑Day Anxiety, 7‑Day Deep Work
- Custom techniques — design your own breathing patterns
- Advanced insights: mood trends, weekly rhythm, average session impact, most‑used techniques
- Quick‑context shortcut on the mood check‑in
Monthly or yearly subscription with optional free trial — or pay once for lifetime access. Local pricing is handled by Google Play and the App Store.
Questions, answered honestly.
Is Coheran really free?
Coheran is free to download with a real free tier — no signup, no card, no ads. The free version includes the one‑tap SOS panic button (always free), two breathing techniques (Box Breathing and the 3‑3‑3 Starter), one grounding mini‑game (Order Numbers), one 25‑minute Flow Mode block per week, daily streaks, mood check‑ins, voice and silent haptic guidance, and full offline use. Premium unlocks the other 10 breathing techniques, the 7 additional grounding games, unlimited Flow Mode at all durations and soundscapes, heart‑rate biofeedback via the phone camera, multi‑day guided programs, custom techniques, and advanced insights. Premium is sold as a monthly or yearly subscription (with an optional free trial) or as a one‑time lifetime purchase.
Does Coheran work without internet?
Yes. The whole library is on‑device. Use it on a plane, in the subway, in a basement gym, or anywhere with no signal.
Do I need to create an account?
No. No signup, no email, no tracking SDKs. Open the app and start breathing in seconds.
How does the heart‑rate measurement work?
Place your finger on the rear camera. Coheran uses PPG (photoplethysmography) — the same principle as an Apple Watch or Fitbit — to measure your heart rate before and after each session. No extra hardware required.
Can Coheran help with panic attacks?
Coheran is designed specifically for the moment a panic attack starts. The home screen has one big SOS button that launches an immediate calming session — no setup, no questionnaire, no tutorial. The Physiological Sigh and Extended Exhale techniques activate the parasympathetic nervous system within 60 seconds.
Is Coheran a replacement for therapy?
No. Coheran is a tool for nervous‑system regulation in the moment. It is not medical advice and is not a substitute for professional mental‑health care. If you're in crisis, please contact a licensed clinician or your local emergency services.
Is Coheran on iPhone?
Yes — Coheran is now on the App Store for iPhone and iPad, and on Google Play for Android. Same free tier, same one‑tap SOS, same 12 techniques on both platforms.
Who built Coheran?
Coheran is built by CANVERSI S.R.L., a small independent studio based in Oradea, Romania. We don't take VC money, we don't sell data, and we answer support emails personally.
Your nervous system has a panic eject button.
It's free. It's in your pocket. It works on planes, in elevators, and at 3 AM. Now on iPhone and Android.
Free to download · No signup · Works offline