Relax Button: press once and breathe with the light until the sky reaches Nightfall
Press once, then breathe with it. Hold to make a breath wait. Tap again to pause.
Nightfall.
No sound? On iPhone the side switch silences the web. Flick it off silent, or just keep going — the light guides the breath on its own.
Press once, then breathe.
One press and the light starts breathing: out as you breathe in, back down as you breathe out, on and on without you doing anything else. Follow it with your eyes half closed. Ten breaths reach Nightfall, which takes about two minutes, and the sky darkens a shade on every one.
If a breath needs to be longer, hold the button and the light will wait at the top of it for as long as you keep holding. Let go and the breath turns. That is the only control there is, and you never have to use it.
Most calm apps ask you to relax and then hand you a timer to watch. Here the only clock is the light in front of you, and it is already moving at a pace your body can follow.
A room, generated
One bed, written by your browser rather than downloaded, breathing in an eleven-second cycle so the light and the sound never drift apart.
It follows you first
The pace starts from your own first breath, then lengthens the out-breath a few percent at a time until it settles near six seconds. Nothing counts at you.
Yours is not mine
Your sky is drawn from the day, your pace and a number generated once on your own device. At Nightfall you get a link that rebuilds that exact sky for one other person.
Why the long exhale
Breathing out for longer than you breathe in is one of the most consistently observed ways to nudge the body toward its settled state. Here the exhale is always half again as long as the inhale, at every depth, and it stretches gently as the session goes on until you land near six seconds.
That end point is not arbitrary. The generated bed breathes on an eleven-second cycle, and four in, one at the top, six out is eleven. By the time the sky is dark you are breathing with the room, and nobody ever told you to.
This is a relaxation and focus practice, not treatment, and it makes no medical claims.
Questions
Do I have to hold the button?
No. One press starts it and the light breathes on its own from there. Holding is only there for when you want a longer breath: the light waits at the top for as long as you hold, and turns when you let go.
What if I can't keep up with the pace?
It starts from you. The first breath you hold sets the pace, and from there the out-breath lengthens a few percent at a time until it settles near six seconds. If a breath is still too long, just breathe how you need to and let the light be scenery rather than an instruction.
Where does the sound come from?
Your browser generates it once when the page loads, then plays it as an ordinary track. Nothing is downloaded, nothing streams, and it keeps playing when your screen locks.
Does it work offline?
Yes. After a first visit the page is saved by your browser, and because the sound is generated rather than fetched, the whole thing runs with no connection.
Is anything saved about me?
Only on your own device: your pace, your preferences and how many times you have reached Nightfall. There is no account, no cookie and no tracking, and none of it leaves your browser.
Is this medical?
No. It is a relaxation and focus practice, not therapy, diagnosis or treatment. If stress or anxiety is seriously affecting your life, please talk to a qualified professional.
Sound for longer
Relax Button has one sound, written for this breath and locked to its rhythm. That is the whole point of it, and also its limit. For hours of sound rather than minutes, and for choosing your own, these are the sister sites, all free and all built the same way.
soundmachine.app
Mix your own soundscape from rain, ocean, fire, thunder and noise, and leave it running all night. The one to open when a single bed is not enough.
rainsound.app
Rain on its own, in every form it takes: on a window, on a tent, on leaves, with and without thunder. If the rain here is the part you came for, it lives there in full.
sonidolluvia.com
La lluvia, en español. The same rain, with the whole site in Spanish.
Reading
How to Stop Overthinking in Just One Minute
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Instantly Calm Anxiety with Nature Sounds
What steady natural sound does for a racing mind, and how to pick the one that works on you.
Mindfulness Techniques to Keep Your Mind Calm
Five small practices that fit inside an ordinary day.
Why You're Struggling to Relax (And How to Fix It)
Overstimulation keeps the mind on watch long after the day ends. Here is the way out.