HotCold

Guide every hot-and-cold interval, train with Apple Watch, and turn completed sessions into clear recovery and resilience insights.

Build a consistent contrast-therapy routine with a timer designed for hot and cold sessions.

HotCold keeps every interval simple and visible, whether you are alternating a sauna and cold plunge, taking a contrast shower, or following your own routine. Choose a preset, customise the timing, and let clear visual and audio cues keep you moving.

TRAIN YOUR WAY • Use Shower, Morning Energy, Sore Muscle, and Deep Sleep presets • Adjust hot and cold intervals, repetitions, countdown, and finishing phase • Pause and resume without losing your place • Receive interval alerts while using other apps

TAKE APPLE WATCH INTO THE SESSION • Run the timer from your wrist • Capture heart-rate data during supported sessions • Keep your iPhone available as a live session monitor • Sync completed Watch sessions back to your phone

SEE YOUR PROGRESS • Review completed and interrupted sessions • Explore hot/cold time, streaks, and completion trends • Inspect heart-rate response across each cycle • Export detailed session data when you need it

THERMAL RESILIENCE INSIGHTS With compatible Apple Watch and Health data, HotCold can present heart-rate recovery, HRV-based trends, a rolling personal baseline, and session-by-session thermal response. These measurements are informational and depend on available sensor data.

HotCold integrates with Apple Health to read relevant workout and heart-rate information. Health access is optional and controlled by you.

Some customisation and insight features require HotCold Premium. Monthly, three-month, and yearly subscriptions renew automatically unless cancelled. A lifetime purchase is also available. Prices are shown before purchase and may vary by region. Manage or cancel subscriptions in your Apple Account settings.

HotCold is not a medical device and does not diagnose, treat, cure, or prevent any condition. Contrast exposure can involve risk. Consult a qualified healthcare professional before beginning a new routine, especially if you have a medical condition.

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