Sleep Habits Lab — Trialist

Does magnesium help you sleep? Does late coffee hurt? Test any habit against the sleep, HRV and heart data your iPhone already has. Private, on-device, no account.

Do your sleep habits actually work? Magnesium before bed, no coffee after 3pm, an earlier last meal, a cold plunge: Trialist tests each one against the sleep, HRV and heart data your iPhone already records, and tells you whether it made a difference. Change one thing, and watch what actually happens in your own health data.

HOW IT WORKS

1. Pick something to test — magnesium before bed, an earlier last meal, cold plunges, no late caffeine, a new routine. Anything you can do (or skip) on a given day.
2. Log it in a tap. Trialist reads your Apple Health data in the background.
3. See the difference. Trialist compares your "did it" days against your personal baseline and shows you the change — with the sample size and strength behind every number.

WHAT MOVES YOUR DATA The heart of Trialist is one honest question: what actually moves your sleep, HRV, resting heart rate, steps, or energy? Trialist ranks your habits, doses, and journal tags by their real day-to-day effect — not by hype. Dig into dose-response ("how much is enough?"), timing effects ("does it matter when?"), and change-points ("when did things shift?").

RATE YOUR DAY Give the day a quick 1–10. Over time Trialist learns what separates your great days from your rough ones — and even which way the arrow points (does better sleep make a better day, or the other way around?).

A JOURNAL THAT EXPLAINS THE OUTLIERS Capture what you ate, how you felt, or a gut symptom in a tap, and tag the day (sick, traveling, big meal, hard workout). Trialist lines those entries up against your metrics — so you can catch the food behind a rough night, or the symptom that shows up a day after a trigger.

BUILT ON HONESTY Most health apps overclaim. Trialist does the opposite. Every result shows how much data is behind it (Limited / Good / Strong), calls associations what they are — associations, not proof — and lets you exclude sick or travel days so they don't skew your results.

PRIVATE BY DESIGN

• No account. No sign-up.
• No cloud. Everything stays on your device.
• No third-party tracking or ads.
• Export your full data anytime as JSON, or a clean PDF to share with whoever you choose.

TRACK EVERYTHING IN ONE PLACE

• Binary habits, A/B comparisons (Running vs Cycling), dosed supplements, and timed routines.
• A visual calendar of every trial, streaks, and adherence.
• A day journal with tags to capture context (sick, traveling, big meal, hard workout…).

TRIALIST PRO Free gets you the whole loop: your first experiment, one-tap logging, its verdict, and the first thing your Apple Health history already says about you. Pro is for when one question isn't enough:

• Run your next experiment, and as many at once as you like
• Every finding from your history — and turn any of them into a zero-logging experiment
• What lifts or drags your day rating
• Dose and timing: how much is enough, and does it matter when
• One-page trial reports to share with a doctor or coach

SUBSCRIPTION DETAILS Trialist Pro is available as a monthly or yearly auto-renewing subscription, or as a one-time lifetime purchase. Prices are shown in the app before you buy. Payment is charged to your Apple Account at confirmation of purchase. A subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period; manage or cancel it anytime in your Apple Account settings. Privacy Policy: https://gettrialist.app/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

— Trialist is for personal, informational, and educational use only. It is not a medical device and does not diagnose, treat, cure, or prevent any disease or condition. Always consult a qualified health professional before changing your health routine.