Recovery. Strain. Sleep. Readiness — from the Apple Watch you already wear.
Correlate turns your Apple Health data into the daily recovery, strain and sleep scores you'd expect from a dedicated fitness band or smart ring — with no extra hardware to buy, no monthly subscription, and your health data never leaving your iPhone.
◈ YOUR DAILY READINESS
One verdict each morning: push today, or back off and recover.
• Recovery, Strain & Sleep — three scores, one glance
• Health Score that shows what went into it
• Stress Load, daily energy, HRV resilience & Biological Age
• Sleep stages (REM, Deep, Core), sleep debt and consistency
◈ ALREADY WEAR A RING OR A STRAP? BRING IT ALL TOGETHER
• Import your Oura and WHOOP official exports — parsed entirely on-device, no account linking
• Garmin and other watches that sync to Apple Health are picked up automatically
• One place for every source and every score, and your history stays yours if you ever cancel a membership
◈ FIND WHAT ACTUALLY MOVES YOUR NUMBERS
Does late caffeine wreck your sleep? Does a hard run lift tomorrow's HRV?
• A 20-second daily journal: a few yes/no questions you chose
• With vs. Without: how your recovery really looked on days you did a habit vs. days you didn't
• Auto-Discovery scans for real correlations (Pearson r), including delayed effects up to 7 days out — labeled as patterns, never as proof
◈ BUILT FOR PEOPLE WHO READ THE NUMBERS
• Pro-grade stats: median, standard deviation, variability, trends and outliers
• Dual-axis charts and scatter plots you can interrogate
• A plain-English coach that shows its work, generated on your iPhone
◈ NO SUBSCRIPTION. NO NEW WEARABLE. TOTAL PRIVACY.
• One-time purchase — no monthly fees, ever
• Works with the Apple Watch and iPhone you already own
• 100% on-device analysis — no account, and your health data never leaves your phone. Anonymous, non-personal usage statistics only.
Stop renting your health insights. Own them.
Requires an iPhone with Apple Health data. An Apple Watch is recommended for recovery, strain, heart-rate and sleep metrics.
