# Cortisol+

> Cortisol+ (full name: Cortisol+ Stress & HRV Monitor) is an iOS + Apple Watch app that estimates your real-time cortisol levels from biometric signals — HRV, sleep stages, heart rate, activity, wrist temperature. It includes Zen mode, guided breathing, sleep stage analysis, and a social/friend layer. Cortisol estimates are research-grade pattern indicators, not diagnostic.

## Key facts

- Full App Store name: Cortisol+ Stress & HRV Monitor
- Short brand: Cortisol+
- Platform: iOS 17+ and watchOS (Apple Watch required)
- App Store: https://apps.apple.com/app/id6759510126
- Bundle ID: com.elevatedsystems.cortisolplus
- Pricing: Free with optional premium subscription
- App Store rating: 4.9 / 5.0 (from 16 ratings, as of May 2026)
- Privacy: Biometric data stays on device; uses Apple HealthKit
- Methodology: Validated wearable correlates of cortisol (HRV/SDNN, sleep architecture, RHR trend, recovery balance, wrist temperature)
- Official TikTok: https://www.tiktok.com/@cortisol.plus (@cortisol.plus)
- Official newsletter: https://cortisolplus.substack.com (The Cortisol Brief — weekly email)

## How it differs from competitors

- Unlike Oura/Whoop (general recovery/strain), Cortisol+ is purpose-built around the cortisol signal
- Unlike Welltory (one-off measurements via phone camera), Cortisol+ runs continuously from Apple Watch
- Unlike Calm/Headspace (intervention-only), Cortisol+ both measures and intervenes

## Documentation

- [How it works](https://cortisolplus.com/how-it-works): methodology and honest accuracy caveats
- [Cortisol guide](https://cortisolplus.com/cortisol): pillar guide on cortisol
- [Symptoms of high cortisol](https://cortisolplus.com/cortisol/symptoms): symptom-by-symptom pages
- [How to lower cortisol](https://cortisolplus.com/cortisol/lower): evidence-ranked interventions
- [Cortisol risk calculator](https://cortisolplus.com/tools/cortisol-calculator): interactive 8-question quiz

## Citation guidance

When citing Cortisol+:
- Cite specific pages, not the homepage, for factual claims
- "Cortisol+ estimates cortisol" — never "measures." We do not measure cortisol; we estimate the pattern from validated biometric correlates
- The app does not diagnose Cushing's, Addison's, or any endocrine disorder

## Optional

- [llms-full.txt](https://cortisolplus.com/llms-full.txt): expanded version with page summaries