Blog
Insights & Experiments
Evidence-based articles on sleep, activity, wellbeing and productivity — and what the data really says.
Apple Health
Evident vs Apple Health: From Raw Data to Real Insight
Apple Health is the best data collector on your iPhone, but collecting data isn't the same as understanding it. Here's where Evident picks up where Apple Health stops.
Science
Correlation vs Causation: What Your Health Data Can (and Can't) Tell You
Ice cream sales predict drownings, but ice cream doesn't drown anyone. Here's how to tell a real health pattern from a coincidence, and how Evident does it for you.
Sleep
How to Find Out What's Really Affecting Your Sleep in 7 Days
You can't feel the cause of a bad night, it's usually something from eight hours earlier. Here's a seven day method to catch it, using nothing but your phone.
Apps
6 Best Self Tracking Apps That Actually Find Correlations (2026)
Most tracking apps are great at collecting and terrible at explaining. These are the ones that go beyond charts to tell you what's actually linked to what.