Description

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 — a short tap to breathe in, two
light ticks to hold, a long pull to breathe out — so you can follow the rhythm with
your eyes closed.

While you breathe, the watch reads your heart rate every second. Afterwards you
get a calm score out of 100 built from completion, how far your heart rate came
down, how strongly it rose and fell with your breathing — real physiology,
respiratory sinus arrhythmia — and, on watches that deliver it, your actual
heart rate variability (RMSSD, the beat-to-beat detail behind true HRV). It is
the difference between a session you were present for and one you merely sat
through.

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 on the Pebble Time 2, sampled every second, with a priming
  screen so the starting reading is a real baseline. The Round 2 and 2 Duo
  have no heart-rate sensor; there the heart-rate parts stay out of sight.
• A calm score from completion, heart-rate drop, breath-linked heart-rate
  swing and — where the watch supports it — real heart rate variability
  (RMSSD), with an honest fallback when there is no reading at all.
• 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.
• A distinct haptic pulse per breathing phase (a tap in, a long pull out), an
  optional soft tone per phase, and a struck singing bowl to open and close a
  session, at four volume levels; silent in Quiet Time or with the watch's
  speaker muted.
• An optional daily reminder that opens Cairn — skipped once you have
  breathed that day.
• Your streak in the app list; on the Pebble Time 2 the colour backlight
  follows the tide.
• Backlight, vibration and heart-rate display all switchable; settings on the
  watch (sized to your text size) or from the phone (Clay).
• Made for the Pebble Time 2 (Emery) colour screen, also built for the Pebble
  Round 2 and Pebble 2 Duo; works without the phone.
• Available in English, Nederlands, Français, Deutsch and Español, following
  your watch's system language.