Correlation Lab: Health Test
Find what moves your health
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Turn Apple Health data into simple experiments. Discover what actually moves your sleep, focus, energy & recovery — in plain English, with honest verdicts
Stop guessing what helps. Start testing it.
Correlation Lab turns your Apple Health data into small, focused experiments — one clear question at a time. Pick two things you're curious about (caffeine and sleep, steps and focus, meetings and readiness) and the Lab quietly tracks how they move together. No dashboards trying to show you everything at once — just a clear verdict, in plain English.
WHY CORRELATION LAB
Most health apps drown you in numbers. Correlation Lab asks one question well: "When X changes, does Y follow?" That's the kind of insight that actually changes what you do tomorrow morning.
HOW IT WORKS
• Pick two metrics — sleep, steps, resting heart rate, HRV, focus minutes, caffeine, readiness, meetings, and more
• The Lab pulls what it needs from Apple Health, or you log it yourself in seconds
• After about two weeks, you get an honest answer — stronger, weaker, or no real link — with a confidence level instead of false certainty
• Every result comes with a "how this was calculated" breakdown and a correlation-isn't-causation reminder, always
START FRESH, OR LOOK BACK
Already have years of Health history? Use it for an instant first read. Making a change starting today — cutting afternoon coffee, adding an evening walk? Start a fresh, forward-looking experiment that only counts the days you actually live through, so you watch the relationship build in real time.
PRIVATE BY DESIGN
Your health data stays on your device. Summaries are written using on-device Apple Intelligence — nothing about your health is ever uploaded. Want deeper analysis? Optionally connect your own AI provider. Entirely your choice, entirely under your control.
BUILT-IN TRUST
• See exactly which days were included, excluded, or missing — and why
• Spot likely confounders before you draw conclusions
• Watch how a relationship shifts over time as you make changes
• Export every experiment whenever you like — your data is always yours
WHAT YOU CAN TEST
Sleep vs. steps. Caffeine vs. sleep quality. Meetings vs. readiness. Hydration vs. energy. Protein vs. recovery. Blood pressure vs. rest. Body weight vs. activity. Or build any pairing you're curious about.
CORRELATION LAB PRO
Unlock unlimited experiments, every advanced Health metric (blood pressure, sleep phases, body composition and more), AI-written explanations, full lab history, and the ability to run several experiments side by side.
Not a medical device. Correlation Lab surfaces patterns in your own data — it isn't medical advice or a diagnosis. Always talk to a healthcare professional about your health.
Test one relationship in your life. See what you find.
Privacy Policy: https://correlationlab.jozefowicz.dev/privacy
Terms of Use: https://correlationlab.jozefowicz.dev/terms
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Spearman rank correlation — auto-selected for ordinal metrics
Lag correlation — X today → Y tomorrow
Weekday vs weekend split — Mon–Fri / Sat–Sun breakdown with "Diverges" flag (Pro)
Outlier winsorization — 5th/95th percentile cap (Pro)
Compare experiments — side-by-side r, direction, confidence, days (Pro)
Custom names, goal tags, backfill — P0 polish
Branded share card — PNG share image
Feedback form — in-app feature requests
The developer, Radoslaw Jozefowicz, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Radoslaw Jozefowicz
- Size
- 55.4 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Monthly pro $3.99
- Weekly pro $1.99
- Lifetime Pro $4.99
- Copyright
- © r6lab Radoslaw Jozefowicz