Cortisol Test VS Oura/Apple Watch/Whoop

You wearable gets stress wrong.

Wearables use heart rate to estimate stress.  Eli measures cortisol, the stress hormone.

Go deeper than your wearable

When your wearable gets stress wrong, Eli gets it right.

When

You’re scrolling on
social media late at night

When

You feel too burnout
to see friends

When

You’re in love

when

You’re walking in nature

When your wearable gets stress wrong, Eli gets it right.

		Your wearable
Measures actual stress hormone (cortisol)		No, measures heart rate
Tells if stress is good or bad		No
Accurately detects chronic & acute stress		Not accurately
Shows if you’re recovered after stress		Not accurately
Personalized guidance based on your hormones		No

THE CHALLENGE

Only cortisol represents stress, accurately.

Doctors, scientists, and academics — cortisol is the most reliable way to measure acute and chronic stress, not heart rate. ¹–³

Sarkar, P., Davidsen, J., & Baumbach, J. (2023). Cortisol—The stress hormone we never really knew. Current Research in Neurobiology, 4, 100049. https://doi.org/10.1016/j.crneur.2023.100049
DuBose, T. N., et al. (2018). Chronic stress exposure and systemic cortisol dysregulation. Psychoneuroendocrinology, 90, 254–262. https://doi.org/10.1016/j.psyneuen.2017.12.011
Adam, E. K., et al. (2008). Diurnal cortisol patterns and health outcomes: A systematic review. Psychoneuroendocrinology, 33(8), 1101–1110. https://doi.org/10.1016/j.psyneuen.2008.06.003

COMPLETE PICTURE

Close the loop
on stress.

Your cortisol should peak in the morning and taper at night. When that rhythm is disrupted, everything from energy to sleep suffers.

Mapping your real stress curve over time with regular cortisol testing gives you insight into what’s actually going on inside your body.

THE SOLUTION

Combine cortisol
with heart rate.

Combining both data transforms stress tracking from a one-dimensional snapshot into a real-time map of your body’s adaptive capacity — a powerful indicator overall health.

Testimonials

What Eli users are saying

“ Cortisol tracking could complement existing devices. For example, if your smartwatch detects disrupted sleep, Eli’s Hormometer could help you see whether stress hormones are a factor.