David Tseng
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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
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...

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Great news for hiring developers
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Love the 3D earth =). This is the ultimate travel tracking app. All you need is here.
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