kaldr

Breathwork · Cold exposure

A calm home for
breath & cold.

kaldr guides your breathing practice and cold showers with quiet, well-timed cues — and keeps every session, offline and in one place.

Coming soon on the
App Store
Coming soon on
Google Play

Everything the practice needs. Nothing it doesn't.

Two practices, done well: guided breathing and cold showers. Cold tones, no clutter — just you and the timer.

Guided breathing

Wim Hof–shaped rounds with paced breaths, retention, and recovery. A calm breathing orb, a bell, and haptic cues keep you on rhythm — so you can practice with your eyes closed.

Cold shower timer

A prep countdown to settle in, then a full-screen shower timer in numerals you can read from across the bathroom. The color deepens as the seconds pass.

Streaks & stats

One clean dashboard: your current streak, a weekly overview, per-practice totals, and your recent sessions — including your best retention holds.

Works fully offline

Every timer, cue, and recording runs without a network. Nothing is lost — even a dead battery mid-session leaves your completed rounds saved, syncing when you reconnect.

Start with one breath.

Free to begin. iOS and Android.

Coming soon on the
App Store
Coming soon on
Google Play