Stop guessing whether that supplement, bedtime, or new habit is doing anything. Trialist turns
your iPhone into a personal lab: 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
Trialist is free to start — create experiments, log every day, and see how your "did it" days
compare to your baseline. Trialist Pro unlocks the full insight engine: "what moves your data",
dose-response ("how much is enough?"), timing effects ("does it matter when?"), change-point
detection, head-to-head experiment comparison, food-to-symptom lag, and the good-days analysis.
A few free insights each day, so you can try before you commit.
—
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.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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