Insights & Experiments
Evidence-based articles on sleep, activity, wellbeing and productivity — and what the data really says.
Evident vs Bevel: Habit Tracking vs Correlation Analysis
Bevel helps you build streaks. Evident tells you which habits are actually moving your sleep, mood, and focus. Here's the actual difference, and why one of them is free.
Health Tracking Apps That Don't Sell Your Data (And How to Check)
Most health apps make money twice: once from you, once from your data. Here's how to actually check what an app does with your health information.
You Don't Need a $30/Month Wearable to Know What's Actually Working
Whoop and Oura are excellent at collecting data and expensive at explaining it. Here's what actually finds the pattern behind your sleep and recovery, no subscription required.
How to Find Out What's Really Affecting Your Mood (Without Guessing)
Bad days feel random until you actually look at the data. Here's how to find the real pattern behind your mood swings instead of blaming "just one of those days."
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.
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.
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.
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.