Blog
Short, honest guides on what your Apple Health data can — and can't — tell you. No hype, no miracle fixes, just how to test things properly.
Sleep & Caffeine
Everyone says caffeine wrecks your sleep — but does it wreck yours, and by how much? Here's how to find out with the data already sitting in Apple Health.
Steps & Sleep
"Walk more, sleep better" is repeated everywhere. We break down what a real correlation between daily steps and sleep quality looks like — and how to check your own.
Reading Your Data
A strong correlation between two Health metrics is not proof that one causes the other. Here's a plain-English guide to reading your own numbers honestly.