Sleep Habits Lab — Trialist
Biohacking & Self-Experiments
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
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/
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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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Trialist is now Sleep Habits Lab: same app, a clearer name for what it does.
- A calmer, redesigned look across Dashboard, Experiments, Insights and Journal
- Three starter experiments to pick from: magnesium, caffeine cutoff, no alcohol
- Verdicts wait for enough days before they commit, compare against your pre-experiment baseline, and respect your excluded days everywhere
- Rate your day and see next-day symptom effects
- Honest empty states: no findings before there is data
The developer, RIKU ROBERT BRANDT, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- RIKU ROBERT BRANDT
- Size
- 25.7 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 14 more
- English, Dutch, French, German, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Traditional Chinese, Turkish
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contains
User-Generated Content
Health or Wellness Topics
- In-App Purchases
Yes
- Monthly Subscription $5.99
- Trialist Pro — Lifetime $49.99
- Trialist Pro — Annual $29.99
- Copyright
- © 2025 Riku Brandt