Pulse
Pulse synthesizes therapeutic sound live in your browser — nothing recorded, nothing installed. The ring below runs the same engine as the full app. Press it.
Press the ring
A 10 Hz alpha pulse, faded in gently. Plain laptop or phone speakers are fine.
Free. No account, no sign-up.
Three doors
You don't need the vocabulary. Start from the situation, and Pulse will set the session up — you just press play.
Each door opens the app with the session armed. Nothing plays until you tap.
Field guide
Pulse is one instrument with four delivery modes. The targets are the same — delta, theta, alpha, beta — but the physics of getting them into a nervous system differ, and knowing which is which is most of the manual.
The simplest trick in the catalog, and the one this page greets you with: take a tone you can hear and gate it on and off at the target rate — ten times a second for alpha, twice for delta. Your ears do the rest. No headphones, no subwoofer, no special anything; a laptop speaker is plenty. In the app, any modulated layer has a Wave toggle — ⊓ Pulsed is this mode. On open speakers, it's the one I reach for.
Take a low 40 Hz carrier — more felt than heard — and let its loudness swell and fade at the target rate. Nothing switches off; the tone breathes. On headphones it's subtle, almost subliminal. Through a powered sub it becomes a slow physical rhythm the room participates in. This is ∿ Smooth, the app's default — and it's the reason the hardware corner below exists.
Play 200 Hz into your left ear and 210 Hz into your right, and your brainstem invents what neither ear is hearing: a 10 Hz beat. That's a binaural beat — an auditory illusion with a real research literature and one hard requirement: headphones. In open air the two tones blend before they reach you and the illusion never forms. Cards that work this way carry a 🎧 mark in the app.
At the bottom of the catalog are tones your ears mostly decline — 26 Hz, 30 Hz — and your body accepts instead. Through a powered subwoofer or a tactile transducer they arrive as pressure: sternum, ribcage, the chair you're in. I'm careful with claims here; the often-cited whole-body-vibration research is about mechanical platforms, not audio playback. So the app calls these what they are — vibrotactile explorations, marked SUB.
The hardware corner
Pulse is just sound, so anything that makes sound can be drafted into service. Three builds I actually use:
An old phone you stopped carrying, a cheap powered subwoofer, one aux cable. Open Pulse, Add to Home Screen, plug it into the sub, park the whole thing by the bed. For the price of a takeout dinner you have a dedicated sleep unit — delta through a sub is a different experience than delta through a phone speaker.
If your home theater has a subwoofer, Pulse’s smooth-AM presets land exactly where it lives: 40 and 50 Hz carriers with slow envelopes. Played through the receiver, the pulse stops being a sound in front of you and becomes something the room itself is doing.
Pulse runs happily in a background tab underneath your music — your computer mixes the streams. Keep a pulsed alpha layer at low depth and around 20% volume and it vanishes into whatever you’re playing. After a few minutes you stop noticing it, which is roughly the point.
Honest science
I built Pulse because I wanted a tool that took sound seriously without overclaiming. Some frequencies in the catalog have research behind them; others are traditions with centuries of practice and no lab. Every card in the app tells you which one you're holding — including when the honest answer is "we don't know." Three cards, quoted as they appear:
Delta wave associated with deep dreamless sleep and unconscious cellular restoration.
Stapleton et al., 2016
Earth’s fundamental electromagnetic resonance frequency — the alpha/theta border, also called Earth’s heartbeat.
Schumann, 1952; König, 1979
Whole-body-vibration platform research (Rittweger et al., 2000) is on mechanical platforms, not audio playback — included here as a vibrotactile audio exploration, not a clinical claim.
The caveat is the description
When a card can't claim something, it says so. That's the product.
Community
Every session in Pulse is a stack of layers — a delta bed, an alpha pulse over it, maybe a sub drone underneath. That's a recipe, and recipes want to be passed around. Sharing mixes as links is coming. For now the trading happens the old way — in the group:
A community is forming around this work.
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Install it like an app
On a phone, open your browser's share or menu icon and choose Add to Home Screen. Pulse will launch full-screen, no browser bar.