Breath Sync

Resonance  ·  7.83 Hz anchor

Ready
—
7.83 Hz sync
awaiting sync
vol
epoch: --
tone sweeps quickly · then holds at 128 Hz or 256 Hz
the stable pitch is your cue to breathe steadily
cycle 0%
Synced to Unix epoch — the same clock ticking
on every machine on Earth since Jan 1, 1970 UTC.
Anyone pressing this anywhere lands on the same breath.
Tone runs in background. Tab hidden, phone screen off —
the audio keeps going. The visual pauses; the rhythm doesn't.
↓   read below
How to use
1Choose a mode based on what you need right now — not what you think you should do. Recover is the default for a reason: it works for almost every situation, passively, without attention.
2Press Sync + Start. The ring turns amber — not a loading screen, but alignment. The tool is waiting for the next shared cycle boundary in Unix epoch time, so every device on Earth running this page enters the same breath phase simultaneously.
3When the ring turns green, the tone sweeps up quickly to 256 Hz — that's your signal to inhale. It settles there and holds. Breathe in steadily for the rest of the phase while the tone is stable.
4When the tone drops quickly to 128 Hz, exhale. The stable low tone holds through the rest of the exhale. The sweep is the indicator; the hold is the invitation to breathe with it.
5After the first full cycle, close your eyes. The tone carries you. You do not need to watch the screen. One count per second — the body finds this on its own.
6The tone continues even when you switch tabs or lock your phone screen. Leave it running in the background. Return whenever you want. You will always be in sync.
The modes
Release
4 · 0 · 8
12s cycle  ·  5 cycles/min  ·  extended exhale
The decompression mode. The exhale is twice the inhale — which is the fastest physiological route to activating the parasympathetic nervous system. Your heart rate drops on the exhale; a longer exhale means a longer drop. Use this when you're running hot, post-conflict, post-sprint, or when the body is stuck in a state it needs to leave. Most effective when you actually feel the need for it.
Calm
5 · 0 · 5
10s cycle  ·  6 cycles/min  ·  studied cadence
The studied cadence. The 0.1 Hz breathing rate has more published HRV and coherence research behind it than any other. Equal phases, no holds, smooth and symmetric. A reliable entry point if Recover feels too slow — the physiological effects are comparable, and many people move naturally from Calm to Recover over time as they become comfortable with the slower rhythm.
Focus
4 · 4 · 4 · 4
16s cycle  ·  tactical  ·  symmetry
The symmetry pattern. Four equal phases balance the nervous system without tipping toward sedation or arousal — which is why it appears in high-stakes training protocols. Feels metronomic and deliberate. Excellent for timed focus intervals, pre-performance preparation, or when you need to be sharp without being wired. Less suited for ambient all-day use; the held tones create a clockwork quality that rewards attention rather than releasing it.
Recover
6 · 0 · 6
Resonance  ·  12s cycle  ·  5 cycles/min
The universal mode. Five cycles per minute sits at the resonant frequency of the baroreflex system — the body's own pressure-regulation loop. At this rate, breath, heart rate, and blood pressure oscillations fall into measurable synchrony, producing the largest increase in heart rate variability of any cadence. It is slow enough to feel calming, fast enough that people stay with it unconsciously. The body doesn't have to try. It just finds it.
Ocean
8 · 0 · 8
16s cycle  ·  3.75 cycles/min  ·  ambient
The ambient mode. At 16 seconds a cycle, the rhythm crosses a perceptual threshold — it stops feeling like breathing and starts feeling like tide. People listen to it more than they breathe with it, which makes it beautiful but less physiologically active than Recover. Best for deep background immersion, creative flow states, or when you want the room to have a pulse rather than a clock.
The tone design
The sweep used to span the entire phase — rising for the full inhale duration, falling for the full exhale. The result was a tone that felt perpetually in motion, never arriving anywhere. It was an indicator but never a landing.

The updated design compresses the sweep into roughly the first 25% of each phase. The tone reaches its target frequency quickly, then holds there steadily for the remaining 75%. On a 6-second inhale: the pitch sweeps up in about 1.5 seconds, then sits at 256 Hz for 4.5 seconds. On a 6-second exhale: drops in 1.5 seconds, holds at 128 Hz for 4.5 seconds.

The result is a tone with clear structure — a sharp directional signal followed by a stable confirmation. The sweep says change direction now. The hold says you're there, stay here. The body finds the stable pitch easier to breathe with, because it's no longer chasing a moving target.

This is also why Focus felt different from the other modes: its hold phases were already providing that stable landing. The updated design gives every mode that same quality, even when there are no formal breath holds.
The audio tones
128 Hz is the bottom anchor — a low C, grounding and still. This is where exhale lands and rests.

256 Hz is the top anchor — one octave higher, middle C, bright and open. This is where inhale arrives and rests.

Both are harmonic multiples of the Schumann resonance fundamental at 7.83 Hz: 128 = 7.83 × 16.35, 256 = 7.83 × 32.7. Whether or not you attach significance to that, the frequencies are mathematically clean and easy to sit with for hours.

Volume: keep it low. The tone should sit beneath your awareness — felt more than heard. The right level is one where you notice it if you focus on it, and forget it entirely when you're absorbed in something else.
Background + screen off
The visual ring — the arc, the counter, the bubble — runs on requestAnimationFrame, which browsers pause when a tab is hidden. That is intentional and correct. There is no point animating something you cannot see.

The tone is different. It runs on the Web Audio API's internal clock, which operates on a dedicated audio thread independent of the page, the tab's visibility state, and the screen being on or off. When you start the session, the entire upcoming 90 seconds of frequency automation is pre-scheduled onto that thread. Every 30 seconds, it schedules another 90 seconds ahead — via a setInterval that keeps ticking even when the tab is hidden.

This means you can press Sync + Start, lock your phone, and put it in your pocket. The tone will continue rising and falling through your earphones, in perfect sync with the global epoch, for as long as the browser process stays alive. When you come back and unlock the screen, the visual ring will resync instantly to wherever the audio is in the cycle.

The tone does not stop. Only the picture pauses.
The global totem
When you press Sync + Start, this tool does not begin immediately. It waits.

It calculates the milliseconds remaining until the next cycle boundary in Unix epoch time — the universal clock ticking identically on every machine on Earth since January 1, 1970, 00:00:00 UTC. No server. No satellite. No coordination. Just arithmetic on a shared integer: Date.now() % cycleMs.

Any two people pressing this button — seconds apart or hours apart, in different countries — will always enter the same phase of the same cycle at the same moment. There is no central authority. The epoch is the conductor.

The amber waiting ring is not a loading screen. It is a liminal space — the moment between intention and synchronization. You cannot rush it. You can only wait for it to arrive.

When the ring turns green and your inhale begins, somewhere else on Earth another ring also just turned green. You are breathing in phase with a stranger you will never know. That is the point.