Add cold plunge
Response from developer
Thank you for the suggestion. It’s a great idea! Cold plunge tracking is planned for a future update

Track your sauna sessions and gain insights into how heat impacts your sleep, heart rate, and recovery. Monitor your 'heat age' and analyze individual sessions with detailed metrics and photos. Unlock advanced health analyses and personalized recaps with a subscription.
1.9.0
October 28, 2026
iPhone Duo: opened flat, the live timer splits at the hinge, with the large ring on one side and the rounds and controls on the other. Stood half open on a table, it becomes a timer you can read from across the room. Christmas: from November 28, a Christmas tab holds an advent tree. Each December day with a sauna opens a pocket, along with the Nordic traditions of the season and your year's recap, for everyone. Each round and each break can now be edited, while logging a session and once it is over. The total time and the start follow. The score shows as you fill in a session: you see what the sauna hat, water or a few more minutes in the heat would add. Stats: new insights (your best period, your sauna day, your rhythm, what would raise your score) and clearer breakdowns. Apple Watch, Watch Outside mode: End round, Not a round and Start round, for when the sensor misses the watch coming off or going back on. A session in progress comes back if the app is closed. Apple Watch: the round's timer stays on the watch face once the watch locks, sessions hold up better when the app is closed or the watch comes off, and Settings explains the three ways to use the watch. Also: fixes and smaller improvements.
MoreApple Watch, sleep, HRV, recaps, widgets and more
Thank you for the suggestion. It’s a great idea! Cold plunge tracking is planned for a future update
Sauna Metrics is a health and fitness app designed to help users track their sauna sessions. It logs details like temperature, humidity, and personal feelings, then analyzes how heat affects sleep, heart rate, and recovery.
Heat Age is a single metric in Sauna Metrics that estimates how your body handles heat, based on your sauna sessions, resting heart rate, VO2max, and sleep data. It also tracks its pace over time and provides details on what influences it.
Yes, the yearly subscription plan for Sauna Metrics Pro includes a 7-day free trial. This allows users to explore the premium features before committing to a purchase.
Sauna Metrics Pro offers six health analyses: sleep, heart rate recovery, body, blood pressure, training, and weekly dose. These are compared between sauna days and rest days to provide comprehensive insights.
Yes, Sauna Metrics is available on Apple Watch. You can start a session, monitor your heart rate live, receive alerts for high heart rates, and use a 10-minute recovery countdown directly from your wrist.
Your sauna sessions and Health data are stored securely on your iPhone. The app's privacy policy details how your information is handled and protected.
The app was last updated on October 28, 2026, indicating active development. Users can expect regular updates to improve features and performance.
Sauna Metrics has an age rating of 4+, making it broadly accessible. However, it's important to consult a doctor before using the sauna if you have a heart condition, as heart rate is a guide and not a medical measurement.