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Your Apple Watch collects amazing health data — but never tells you WHY. Correlate finds what actually affects your health using real statistics:
🔬 Granger Causality — detects if X causes Y (up to 14-day lag)
📊 Change Point Detection — finds when something shifted
🧬 Bio Age, Strain Score, Body Battery, Sleep Debt
No hardware needed. All analysis on-device. Privacy-first.
Free tier included. Built by a solo indie dev.
Correlate - Health Insights Free WHOOP alternative using your Apple Watch data
David Tsengleft a comment
Hey Product Hunt! 👋 I'm David, a solo dev from Taiwan. I built Correlate because I was paying $239/year for WHOOP when my Apple Watch already collects the same raw data. What was missing was the analysis layer. The feature I'm most proud of is Granger Causality Analysis — a real econometrics method that tests whether changes in one metric PREDICT future changes in another. It's the difference...
Correlate - Health Insights Free WHOOP alternative using your Apple Watch data
David Tsengstarted a discussion
Do you use WHOOP, Oura, or just Apple Watch? Why?
I'm curious about this community's setup. I pay for WHOOP ($239/year) but realized my Apple Watch already collects most of the same raw data — HRV, resting heart rate, sleep stages, blood oxygen. What I was actually paying for was the analysis layer (strain score, recovery, sleep coaching), not the hardware. Are you using WHOOP, Oura, Garmin, or just Apple Watch? What keeps you paying (or not...
David Tsengleft a comment
Great news for hiring developers
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We got "THIS SITE IS OK". It's good to grade the website before a big event. I like its simple design!
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