
About
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.
What's New in Hormetic
1.6.5
August 24, 2026
Learn covers all three, not just heat The Learn tab now carries cold and hot-water sections alongside the sauna research, each with its own reference list. New explainer: the three stages of cold-water immersion — cold shock, physical incapacitation, then hypothermia. Safety knowledge, not technique. No stage is something to chase, and the app says so. Your session, with the studies attached Cold and hot-water sessions now get the tailored, cited explainers heat has had: what this particular session was, and what the research actually says about it. Plunge after a sauna and you will see the contrast evidence — including its honest gap, since those studies alternated hot water with cold rather than dry heat. A clearer read on consistency Adapt now charts sessions per week against Hormetic's consistency threshold, instead of shading days by minutes logged. Press and hold any weekly dose chart to scrub across it and read the actual numbers, week by week. Delete a session Swipe left on any row in the Log. Useful for the accidental starts that used to be stuck there for good. Accidental sessions no longer count anywhere Tap Start and stop within a few seconds and nothing is recorded — not in Hormetic, and not in Apple Health. Previously a stray tap left a 0:00 workout in Health that Hormetic hid but could not remove. Fixes A hot-tub session followed by a cold plunge was described as a heat session. It now names the soak correctly — hot water and dry heat are kept on separate books everywhere else in the app, and this was the one place that slipped. Every model-derived value is still labeled Estimated, every claim still links to its source, and nothing leaves your device.
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FAQ
What is Hormetic?
Hormetic 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.
How does Hormetic track heat exposure?
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.
Is Hormetic private?
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.
What devices does Hormetic support?
Hormetic requires an iPhone running iOS 18 or later. An Apple Watch is optional and is used for heart rate tracking.
How much does Hormetic cost?
Hormetic is a paid app, available for $1.99. It does not have in-app purchases or advertisements.
Does Hormetic have ads?
No, Hormetic is ad-free. As a paid application, it does not contain any advertisements.
How often is Hormetic updated?
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.
What is the age rating for Hormetic?
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.











