CalmTide reads the data your Apple Watch and iPhone already collect in Apple Health and weighs it against published exercise-and-recovery research to estimate your cortisol load and HPA-axis balance. Everything is computed on your device. There is no account, no analytics, and no server — your health data never leaves your iPhone.
TODAY
- HPA Balance Score — a single 0–100 read on how your week is trending, as a ring you check at a glance.
- One smart recommendation — a single, specific action for today, drawn from last night's sleep, your HRV, and your recent training load.
- Daily protocol checklist — breathwork, Zone 2 progress, 7+ hours sleep, no stacked hard sessions, morning sun.
- Recovery signals — HRV, resting heart rate, sleep, and respiratory rate, in one row.
EVERY WORKOUT, SCORED FOR CORTISOL
- MET-minutes tracked against a research-backed 530/week target.
- A zone-distribution chart showing where your week's training actually landed.
- A session list where every workout carries a cortisol-effect badge — Reducing, Neutral, or Spiking — so you can see which sessions calm you and which tax you.
THE 8-WEEK TREND
- Your estimated baseline cortisol plotted across 8 weeks against an optimal trajectory.
- Annotated spikes (a stacked-HIIT week shows up immediately) and milestone markers.
- Auto-generated insights that explain what changed and why.
GO DEEPER WITH PRO
- Full 8-week baseline trend, training-load analytics (ACWR, monotony, strain), and 60- and 90-day history across every insight.
- A cortisol forecast that projects where your load is heading over the next few days — so you can act before it spikes.
- Deeper correlations between your sun, sleep, and recovery signals.
BREATHWORK & GENTLE NUDGES
- A built-in guided breathwork timer; completed sessions count toward your mindfulness component.
- Optional, opt-in notifications: a morning check-in, a post-hard-workout recovery nudge, a Sunday weekly summary, and a recovery alert when two hard sessions stack up.
RESONANCE BREATHING
- A guided coherence-breathing session: follow the expanding orb at about six slow, even breaths a minute — the resonance pace research links to higher heart-rate variability and a calmer, more vagal state.
- Adjust to the slowest pace that still feels comfortable (4.5–6.5 breaths/min); five minutes is a sufficient dose.
APPLE WATCH & WIDGETS
- An Apple Watch companion for your score and today's recovery at a glance.
- Home Screen and Lock Screen widgets for your HPA Balance Score and daily status.
WORKS WITH SOLGLOW
If you also use SolGlow, the two apps exchange a small summary through a secure on-device App Group container — never over the internet. SolGlow's morning-sun and Cortisol Awakening Response data sharpen CalmTide's estimate; CalmTide writes back a weekly summary. Neither app needs the other to work fully.
PRIVACY THAT IS REAL, NOT MARKETED
- No account. No login. No sign-up.
- No third-party analytics, advertising, or tracking SDKs.
- Apple Health data is read only on the device and is never transmitted off it.
- CalmTide makes no network calls with your data. Your data is never sold. Ever.
REQUIREMENTS AND NOTES
- iPhone running iOS 18.6 or later. Apple Watch companion requires watchOS 11.
- HRV and sleep stages are collected by Apple Watch. CalmTide works without a Watch, but its estimates become much less accurate.
- CalmTide is an estimation tool based on published exercise-physiology research, not a medical device. It does not measure cortisol directly and does not diagnose, treat, cure, or prevent any condition. Always consult a qualified healthcare professional about stress, sleep, or health concerns.
EULA:
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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