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SaunaMind helps you track sauna, cold and training sessions with live heart rate: effort zones in the heat, how far your heart rate settles in the cold, plus hydration, readiness and progress when the relevant data is available.

No. SaunaMind is a general wellness and fitness app. Its scores, zones and readiness context are wellness estimates, not medical measurements.

No. You can still log sessions without one. A Bluetooth chest strap or a Garmin watch with Broadcast Heart Rate on gives live effort zones.

Yes. Turn on Broadcast Heart Rate on the watch, then connect it from More › Devices › Garmin watch. If it never shows up, pair it once in iPhone Settings › Bluetooth and scan again.

From our founder: I have personally used Polar heart-rate straps and Garmin watches during more than 180 sauna sessions, and counting, without experiencing any issues. However, this is my personal experience only. Wearable devices may have manufacturer-specified operating-temperature limits and may not be designed for sauna conditions. Heat can affect their accuracy, performance, battery life or warranty. Use any wearable in the sauna at your own discretion and always follow the manufacturer’s instructions and temperature limits. Heart-rate readings are provided for general information only and should not be treated as medical or safety advice.

Five ranges based on your live heart rate relative to your resting heart rate: Very Light, Light, Moderate, Hard and Peak. No body temperature is measured or estimated. They are wellness estimates, not clinical measurements.

Yes. With your permission it reads your resting heart rate and writes every finished session to Apple Health as a workout with its heart-rate curve. Health data stays on your device.

Yes, through Apple Health. Start any workout on the watch before your session (Other is fine) so it samples heart rate every second; SaunaMind reads it from Apple Health and updates every few seconds. End the watch workout when you finish. Without a workout running the watch only records every few minutes, so readings lag. An Apple Watch cannot broadcast heart rate over Bluetooth, so a chest strap or a Garmin with Broadcast Heart Rate gives the sharpest live readings. The SaunaMind watch app mirrors your session and gives you Start and Stop on the wrist.

Live heart rate: any Bluetooth chest strap (Polar, Wahoo, CooSpo, Garmin, Magene), a Garmin watch with Broadcast Heart Rate on, a WHOOP with the WHOOP app broadcast on, or an Apple Watch through Apple Health. Readiness and recovery: Oura, WHOOP and Apple Health. Finished sessions go to Apple Health and Strava. Availability depends on device, permissions and build version.

No. Sessions can start open-ended. Timers are available when you want structure.

Join the waitlist and we will send TestFlight access as testing spots open.