Your stress,
decoded.
Cortisol+ estimates your cortisol in real time using HRV, sleep stages, and 10+ Apple Watch signals — no lab, no needles.
Everything you need to decode your stress
Real-time tracking, deep biometric breakdown, an AI coach, sleep analysis, and a community on the same journey.
Loved by early users
4.9 out of 5 stars across 16 ratings on the App Store — and growing every week. People with Apple Watches who actually want to understand their stress.
Download on the App StoreWhat users say
This app has everything!!
"This app has everything I need for my fitness journey. I needed something to track my stress and cortisol levels. This tracks my Blood O2 levels, resting heart rate and HRV. Really cool. It also tracks my sleep and my activity. I connected with friends and we are sharing our progress with each other. This is actually cool."
This actually helped
"I've been using for the past 2 weeks and noticed my stress and anger is down tremendously"
10 sensors. No guessing.
Every factor that drives your stress.
HRV-based cortisol score
Continuous estimation from heart rate variability — the gold standard for autonomic stress.
Sleep × cortisol
See how sleep stages drive next-morning cortisol — and what to fix tonight.
Zen mode & breathwork
Guided protocols that measurably drop your cortisol score in minutes.
The cortisol library
Symptom by symptom, food by food. The complete guide to understanding and lowering cortisol — written by the team building the tracker.
Start with the cortisol guide →