Contrast therapy,
timed.
A purpose-built timer for sauna and cold plunge sessions. HealthKit sync, smart protocols, Apple Watch support.
Free · No account required 
Built for the session.
Quick Start
Two taps to start timing. Sauna or cold plunge — pick one and go. Designed for wet hands and foggy glasses.
Smart Protocols
Multi-phase session plans that guide you through sauna, cold plunge, and rest intervals with automatic transitions.
HealthKit Sync
Sessions save to Apple Health as workouts automatically. Your contrast therapy shows up alongside everything else you track.
Session History
Every session is saved. Track personal records, total exposure time, and build the consistency that drives results.
Apple Watch
Start, pause, and advance phases from your wrist. Haptic alerts tell you when it's time to switch — no phone needed.
Completely Offline
No servers, no cloud sync, no network requests. Your data stays on your device. Period.
Start your session.
Free on the App Store. No account required.
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