Description

Breathe with the tide.

A guided breathing coach with live heart rate. Inhale and the water rises, exhale and it falls. Finish a session, lay a stone.

Cairn turns a breathing exercise into a tide. Start a session and the waterline
rises while you inhale and falls while you exhale, uncovering a cairn of stones
on the shore — no counting, no timer to stare at, just a rhythm to follow. A
pulse on your wrist marks every phase change, and soft tones can mark them too.

While you breathe, the watch reads your heart rate every second. Afterwards you
get a calm score out of 100 built from three things: how much of the session you
finished, how far your heart rate came down, and how strongly it rose and fell
with your breathing. That last one is real physiology — respiratory sinus
arrhythmia — and it is what separates a session you were present for from one
you merely sat through.

It is called a calm score, not HRV, on purpose: the watch gives apps a heart
rate in beats per minute and never the beat-to-beat intervals a true HRV
measurement needs. Cairn measures what it can actually see, and says so.

Finish a session and a stone is added to your cairn. Keep it up day after day
and the stack grows, badges unlock, and the progress screen shows where your
calm score and resting heart rate are heading over the last week and month —
with one line of coaching drawn from that history.

FEATURES
• Four patterns: Coherent (5.5 s in / 5.5 s out), Box, 4-7-8, and a Custom
  rhythm you set in half-second steps.
• Sessions of 1, 2, 3, 5, 10 or 15 minutes.
• Live heart rate, sampled every second, with a priming screen so the starting
  reading is a real baseline.
• A calm score from completion, heart-rate drop and breath-linked heart-rate
  swing — and an honest fallback when there is no reading.
• A growing cairn, six badges, a personal best and your last 20 sessions.
• 7- and 30-day trends for calm score and resting heart rate, plus a coaching
  line.
• Haptic pulses and optional tones at four volume levels; backlight, vibration
  and heart-rate display all switchable.
• Settings on the watch or from the phone (Clay).
• Made for the Pebble Time 2 (Emery) colour screen; works without the phone.
• Available in English, Nederlands, Français, Deutsch and Español, following
  your watch's system language.