Get Cortisol+
Choose the Cortisol+ app for your iPhone or Android device.
The iPhone version requires iOS 17+. Core analysis requires an active subscription or an eligible trial.
What Cortisol+ does
Cortisol+ brings available HRV, resting heart rate, sleep and activity into one view. Its 0–100 wellness score reflects a model, not a cortisol measurement. Read how the score works before interpreting it.
The app includes wearable trends and guided breathing. A change in the score does not establish that an intervention changed your hormone levels.
Using Android? Visit Cortisol+ on Google Play for Android compatibility, features and purchase details.
What you need on iPhone
- An iPhone running iOS 17 or later. This download is the iPhone version.
- A compatible Apple Watch paired to that iPhone. Available measurements depend on Watch model, software, region, permissions and wear time.
- Apple Health permissions. On first launch you grant read access to heart rate, HRV, and sleep. Wearing the Watch overnight gives the app its most useful data.
The app is free to download. Analysis requires an active subscription or eligible trial. Check the in-app offer for current pricing, trial eligibility and renewal terms.
How the wellness score works
Apple Watch does not directly measure cortisol. Cortisol+ combines available wearable readings with model assumptions and, as sufficient history accumulates, a personal baseline. HRV, resting heart rate and sleep can vary with stress, exercise, illness and many other factors. A wellness score cannot determine your cortisol level.
That means Cortisol+ is a pattern tracker, not a medical device. It won't diagnose Cushing's syndrome or adrenal insufficiency, and it's not a substitute for lab testing when a doctor recommends one — read how it works for the full methodology and its limits.
Looking for a cortisol tracker app?
Choose Cortisol+ if you want to organize available Apple Watch stress and recovery signals and understand the factors behind a wellness score. If you need a cortisol concentration or an explanation for symptoms, this app cannot provide that result.
Before choosing a plan, read the Apple Watch setup guide, compare documented approaches from stress apps, and try the free observation journal. The journal works without an account or subscription.
Your data stays yours
The core wellness score is calculated on your device. Optional connected services, account features and coaching have additional data flows. The full details are in our privacy policy.