Wearables + medications, finally in one place

Know why, not just what.

Cairn Health unifies your Apple Health, Oura, Whoop, Fitbit and Google Fit data, tracks your medications, and explains changes against your own baseline — in plain language you can bring to your next doctor's visit.

Free during beta. No spam — one launch email, that's it.

Cairn Health is a wellness insight tool — not medical advice, diagnosis, or treatment.

Syncs with the tools you already use

  • Apple Health
  • Google Fit
  • Oura
  • Whoop
  • Fitbit
  • 2,400+beta waitlist members
  • 38metrics normalized into one score
  • 100%of insights cite your own data

Your body sends signals. Cairn connects them.

Four pieces that most health apps keep separate — working together, calmly, around your normal.

Every wearable, one honest picture

Oura says 84. Whoop says 62. Fitbit says "fair." Cairn ends the score wars: it pulls data from Apple Health, Google Fit, Oura, Whoop and Fitbit, then normalizes everything into one unified daily and weekly score built on consistent definitions — so a good day means the same thing everywhere.

  • Sleep, HRV, resting heart rate, activity, and recovery in one timeline
  • Duplicate readings de-duplicated automatically
  • Works with just your phone if you don't own a wearable

An insights engine that answers "why?"

Most apps tell you what happened — your sleep score fell, your HRV dipped. Cairn compares every change against your own 90-day baseline, then looks across sleep, recovery, activity, and your medication log to find what moved together. The result is a short, plain-language explanation instead of a mystery number.

"Your sleep quality dropped 20% this week, correlating with reduced HRV and the days you logged Medication X."

Correlations in your data are conversation starters, not conclusions — Cairn never tells you a cause. Bring what it surfaces to your doctor.

Medication tracking that listens back

Log doses in two taps, then answer a gentle post-dose check-in: energy, mood, sleep, anything unusual. Over weeks, Cairn quietly watches for patterns between what you take and how you feel — like headaches clustering on the days after a dose change — and flags them for you to review.

  • Reminders that adapt to your actual schedule
  • Symptom check-ins take under 20 seconds
  • Possible side-effect patterns flagged with the data behind them

A flagged pattern is not a diagnosis, and Cairn will never suggest stopping or changing a medication. Always talk to your doctor or pharmacist before making any change.

Walk into appointments with answers ready

One tap builds a shareable doctor report: your trends versus baseline, medication timeline, flagged patterns, and the questions worth asking — as a clean PDF or secure link. Cairn also surfaces evidence-based supplement and diet discussion points, each with citations to the underlying research, so the conversation starts from published evidence rather than a forum thread.

  • 90-day trends summarized on one page
  • Every discussion point linked to its source study
  • Export or revoke shared links anytime

Supplement and diet items are discussion points only — not recommendations, and never a substitute for professional advice. Some supplements interact with medications; review anything here with your doctor or pharmacist first.

How it works

Three steps, about five minutes, no spreadsheet required.

  1. Connect your sources

    Link Apple Health, Google Fit, Oura, Whoop, or Fitbit. Cairn backfills up to 90 days of history to learn your personal baseline.

  2. Log meds & quick check-ins

    Add your medications once. After doses, a 20-second check-in captures how you actually feel — the context wearables can't see.

  3. Get the "why" — and share it

    Plain-language insights explain changes against your baseline. When something is worth a professional opinion, one tap adds it to your doctor report.

Simple pricing, calm by design

Start free. Upgrade when you want the full "why."

Cairn Free

$0forever

  • Sync all supported wearables
  • Unified daily health score
  • Medication reminders & logging
  • 30-day history
Join the waitlist

Most popular

Cairn Plus

$7.99/month

  • Everything in Free
  • Full "why" insights engine vs. your baseline
  • Post-dose check-ins & side-effect pattern flags
  • Evidence-based discussion points with citations
  • Shareable doctor reports (PDF + secure link)
  • Unlimited history & data export
Get early access

Frequently asked questions

Is Cairn Health medical advice?

No. Cairn Health is a wellness insight tool, not a medical device, and it does not provide medical advice, diagnosis, or treatment. It highlights patterns in your own data so you can have a more informed conversation with your doctor. Always talk to a qualified healthcare professional before starting, stopping, or changing any medication, supplement, or treatment.

Is my health data private and secure?

Yes. Your data is encrypted in transit and at rest, and we follow HIPAA- and GDPR-aligned practices: data minimization, access controls, audit logging, and the right to export or permanently delete your data at any time. We never sell your health data and never share it with advertisers, insurers, or employers.

Which wearables and platforms does Cairn Health sync with?

Cairn Health syncs with Apple Health, Google Fit, Oura, Whoop, and Fitbit. Data from every source is normalized into one unified daily and weekly health score, so you don't have to reconcile five different apps and scales yourself.

Can Cairn Health detect medication side effects?

Cairn Health can flag possible side-effect patterns — for example, when a symptom or metric change tends to occur on days you logged a specific medication. These are statistical observations about your own data, not a diagnosis and not a determination that a medication caused anything. Never stop or change a medication based on the app; bring the pattern to your doctor or pharmacist and decide together.

Do I need a wearable to use Cairn Health?

No. Cairn Health works with the health data your phone already collects through Apple Health or Google Fit, plus your manual medication logs and daily check-ins. A wearable like Oura, Whoop, or Fitbit adds richer signals such as HRV and sleep staging, but it is not required.

How much does Cairn Health cost?

Cairn Free includes wearable sync, unified daily scores, and medication reminders at no cost. Cairn Plus is $7.99/month and adds the full "why" insights engine, side-effect pattern flags, evidence-based discussion points, and shareable doctor reports.

Stop guessing. Start understanding.

Join the waitlist and be first in line when Cairn Health launches.

Join the waitlist