Trialist
Pick what to test
Start from a template or your own idea—magnesium, a caffeine curfew, cold showers. Trialist tracks the right metrics for it.
Trialist turns Apple Health into a lab. Did it, or didn't you? Log the day and find out whether your sleep, HRV or recovery actually changed—measured against your own baseline, with the stats to back it.
No spreadsheets, no willpower to remember. Pick something to test, tap a button each day, read the verdict.
Start from a template or your own idea—magnesium, a caffeine curfew, cold showers. Trialist tracks the right metrics for it.
One tap a day. Add a dose or a time when it matters. That's the entire habit.
Once there's enough data, Trialist compares your intervention days to your baseline and tells you what actually changed.
You log. Trialist runs the statistics—so a result is a real signal, not a lucky week.
Your intervention days compared to your baseline—not a generic average—with the percentage change for every metric.
No verdict appears until there's enough data, and each change is flagged as meaningful or just noise.
Spots the breakpoint—above ~200mg, deep sleep drops—from the amounts you log.
Detects a time-of-day limit relative to your bedtime—within ~3h of bed, it hurts.
Pit two options head-to-head, or line up two periods to check nothing else changed.
Finds effects that trail by a day or two, and reports correlations with an honest association, not proof.
Three people, three questions, and the data that settled each one.
Kiwi before bed, a caffeine curfew, and late meals—three quick tests, and only two of them mattered.
Read the experiment Supplements Same 200mg, +5.8%The first magnesium did nothing. The same dose from another source moved the metrics—here's how he confirmed it.
Read the experiment Gut health Trigger found · +24hThe symptoms seemed random—until he checked for a delay. The trigger was hiding about a day behind.
Read the experimentFree to start. Your first verdict is a couple of weeks of taps away.
No. There are no accounts and no cloud—nothing to sign up for.
On your device, privately. Export it as JSON or a PDF report whenever you want.
Sleep stages, HRV, resting heart rate, steps, VO₂ max, workouts, and more from Apple Health.
Trialist waits for enough logged days before calling a verdict—usually a couple of weeks, depending on the test.