Tidal Contrast

Tidal Contrast is a calm coach for heat and cold: saunas, steam rooms, ice baths, cold plunges, open water and cold showers, timed on your Apple Watch and iPhone. IN THE COLD Tap Start for a 3, 2, 1, or just get in: on Apple Watch Ultra, Series 10 and Series 11 the session can start when your Watch goes under water. A glowing ring counts your time, with your heart rate and, on supported Watches, the water temperature. The first 30 seconds are for staying still and breathing slowly while the cold shock passes. IN THE HEAT Sauna and steam rounds with a timer you can feel: a light tap each minute, a warning at 80%, a 5, 4, 3, 2, 1 and an alarm at your time until you tap I'm Out. Then rest, with a reminder to drink some water. By default your Watch and iPhone stay just outside the door, where you can still hear them. FIRM LIMITS Short caps for your first five sessions, standard caps you can raise in steps, and a fixed ceiling on every session that nobody goes past. GUIDED OR TIMER New to it? Guided mode keeps you to cautious caps, with a daily check and a rewarm. Done it for years? Choose Timer mode for the cold, the heat or both: your own time, with the warning, the countdown, the alarm, a ceiling and your spotter still there. REWARM After the cold, a 30 minute rewarm walks you through getting out of the wind, drying off, dressing warm and a warm drink, and checks how you feel. A SPOTTER Choose someone you trust. They hear when you start, when you are out, and if you have not come out on time. Nothing else: no heart rate, no temperature, no location. ON YOUR WRIST Music controls one swipe away. Start from the Action button on Apple Watch Ultra, or with Siri. Double tap to press the main button on supported Watches. Complications show your limits at a glance, and widgets show your totals. AFTERWARDS Every session with its heart rate and water temperature, saved to Apple Health with your permission. Note how it felt, add sessions you did without your Watch, and see your average sleep, heart rate variability and resting heart rate after heat days, cold days and days off. A gentle weekly view, with no streaks. YOUR DATA STAYS YOURS No account, no ads, no tracking. Your sessions stay on your iPhone, your Watch and in Apple Health. Export them as a CSV file at any time. SAFETY FIRST A short health check on first launch, and three quick questions before each Guided session. Answer yes and the app tells you to skip the day. Talk to your doctor before you start if you have a heart condition or high blood pressure, are pregnant, or take medicines that affect your heart. Tidal Contrast is a wellness tool, not a medical device. It does not diagnose or give medical advice, and it cannot keep you safe on its own. Never go into cold water alone.