Della: Breathing Instrument

Della is a breathing instrument: a precision tool for the one thing that quietly steadies your whole nervous system, a slow, even breath.

Most breathing apps drift. A timer that's a few milliseconds off every cycle drifts seconds off over a session, and your body feels it. Della is clocked off the audio hardware itself, so the pace it sets is exact from the first breath to the last, and stays exact whether the session is five minutes or fifty.

FIND YOUR RESONANCE
Everyone has a personal resonant rate, the breathing pace where heart rate, breath, and blood pressure fall into their deepest rhythm. Open Della on your Apple Watch and it measures yours from your heart rate in a few quiet minutes. From then on, "Resonant" paces you at your number, not a generic 6.

BREATHE BY FEEL
A glowing disc breathes on a true sine wave, cyan as you draw air in, warm amber as you release. Turn the screen off and follow it entirely by touch: gentle haptics swell on the inhale and settle on the exhale, on both iPhone and Apple Watch. No screen, no counting, no effort.

TECHNIQUES
Resonant, paced to your measured rate
Coherent 5.5, the classic calming pace
Box 4x4x4x4, steady and grounding
4-7-8, for winding down
Extended Exhale, lean into the calming half of the breath
Physiological Sigh, a double inhale and long release, to reset in a minute
Custom, dial your own inhale, hold, exhale, and hold

KEEP YOUR OWN SOUND
Della's tones and ambient pad are yours to balance, or silence. Your own music or podcast keeps playing right alongside it.

SEE IT TAKE SHAPE
Every session is logged. Watch your resonant rate settle over the weeks and your minutes add up, quiet proof that the practice is working.

BUILT FOR CALM, NOT CLUTTER
No streaks to guilt you, no feed, no noise. Cool near-black, one glowing breath, precise readouts. An instrument, not a wellness app.

Della requires an Apple Watch to measure your personal resonant rate; the breathing instrument itself works on iPhone alone.

Della is designed for relaxation and does not diagnose, treat, or prevent any medical condition. If you have a heart or respiratory condition, talk to your doctor before beginning a breathing practice.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/