ThermaForge: Cold & Heat Log

Track cold sessions on Apple Watch. Log heat sessions on iPhone. ThermaForge helps you record ice baths, cold exposure, and sauna sessions with precise time, temperature, and heart rate data in one clean workflow. Designed for simplicity and accuracy, it makes it easy to track your routine, review your history, and stay consistent over time. KEY FEATURES • Start and track cold sessions on Apple Watch • Log sauna and heat sessions on iPhone • Record duration, temperature, and heart rate • View simple, clear session summaries • Add, edit, and review sessions over time • Sync with Apple Health PRIVATE BY DESIGN Your data stays on your device and in Apple Health. No accounts. No tracking. No ads.