This app tracks your body's response to heat exposure using heart rate and manually entered temperature. It provides detailed session data, a heat-dose score, and a history of your thermal-dose sessions. Your data remains private on your device.
1.6.0
August 4, 2026
SPA MODE — hot tubs and hot baths Step into the water and your Apple Watch Ultra starts the session on its own, reading the water temperature from its built-in sensor. Other models: start it by hand and enter the temperature. • Its own zones and its own estimated soak dose — a separate algorithm from sauna, because a 40 °C soak is not a 90 °C room, and pretending one score fits both would be dishonest • The clock keeps running when you rest an arm on the rim: the rest of you is still in the water. Your Watch taps once and says so on screen • Time immersed is time immersed — the walk to the tub and the towel-off afterward are not counted • Hot-water safety built in: the recommended ceiling, why to stand up slowly, and who should ask a doctor first • Sauna and cold plunge estimates are unchanged
MoreHormetic is a health and fitness app that tracks your body's response to heat exposure. It uses your heart rate and a temperature you manually enter to estimate a heat-dose score and provide detailed session insights.
Hormetic uses your heart rate, the temperature you manually input, and the session duration to calculate an estimated heat-dose score. It also records your heart rate as a HealthKit workout.
Yes, Hormetic is designed for privacy. Your data never leaves your device, and there is no account, analytics, or telemetry. It does not sell personal information.
Hormetic requires an iPhone running iOS 18 or later. An Apple Watch is optional and is used for heart rate tracking.
Hormetic is a paid app, available for $1.99. It does not have in-app purchases or advertisements.
No, Hormetic is ad-free. As a paid application, it does not contain any advertisements.
The latest version of Hormetic is 1.4, last updated on June 28, 2026. The app's algorithm is versioned independently from the app itself for transparency.
Hormetic has an age rating of 17+. This is likely due to the nature of health tracking and the recommendation to consult a healthcare professional before starting new activities.
