Time the heat.
Watch your heart.
A sauna timer built for Apple Watch. Start from your wrist, see your heart rate live, and get a tap before the watch itself gets too hot.
Coming to the App Store
Made for the sauna, not the gym
Watch-first timer
A big, readable chrono with a progress ring toward your target. Runs in the background so the alert fires even with the wrist down.
Live heart rate
Average and peak heart rate for every session, straight from the watch's sensor.
Overheat warning
Apple Watch has limits too. Heat Journal taps you when the watch is getting too hot, so you can cool it before it shuts down.
Weight tracking
Log your weight after a session, in kilograms or pounds, from either device. See both units at a glance.
Wet-hands controls
Double Tap starts, pauses and resumes. On Apple Watch Ultra, the Action button does the same.
Your data stays yours
Sessions live on your devices and sync between your own iPhone and Apple Watch. No account, no server.
Requirements
Apple Watch with watchOS 11 or later, paired with an iPhone running iOS 18 or later. Heart rate requires permission to read from Health; everything else works without it.