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  • N of 1: Self-Experiments screenshot 1
  • N of 1: Self-Experiments screenshot 2
  • N of 1: Self-Experiments screenshot 3

About N of 1: Self-Experiments

Does magnesium actually improve your sleep? Does a new habit really make a difference? Everyone's body is different — and population averages from clinical studies don't predict your individual response. N = 1 is a self-experimentation app that lets you run your own rigorous personal trials, using the same two-phase framework as professional clinical research. How it works Each trial has two phases: • Control Phase — You track your baseline without any intervention, so you know where you're starting from. • Treatment Phase — You add the intervention and keep tracking the same metrics. At the end, N = 1 compares your two phases s in plain English, what actually changed in your own data. The science, without the lab coat Daily check-ins take under 60 seconds. Results with a plain-English summary — no jargon, no exaggerated claims. Just your numbers. New here? Start with the easiest trial in th Ten-Minute Morning Walk for Energy is a 2-weuy — just a short walk each morning. It's the fastest way to see how the whole process wormething longer. A growing library of trials Beyond the walk trial, N = 1's library cover • Sleep — magnesium glycinate, L-theanine • Energy — caffeine, vitamin B-12 • Mood — EPA omega-3, saffron • Anxiety — ashwagandha, lavender (Silexan) • Migraine — magnesium glycinate, vitamin B2 Each trial comes with its own tracked metric references. When your trial ends, you get a full results breakdown — averages, charts, adata showed. Reminders keep you on track: a daily check-iake your supplement or do your habit during the treatment phase. Your data stays privateused only to show you your own results and, in anonymous aggregate form, what similar trher users. N = 1 is a tool for self-observation, not a ice. Always check with a doctor beforestarting a new supplement. More trials coming soon.

What’s new

Version 1.2(3) · Updated September 29, 2026

Thanks for using N of 1! This update includes: - A new "Ten-Minute Morning Walk for Energy" trial — the easiest way to get started, nothing to buy - A quick intro on the sign-in screen explaining what the app does - The demographics form is now optional - Added Terms of Service and Privacy Policy, with a one-time consent screen for new sign-ins - Reminders no longer nag you after you've already checked in for the day - Evening check-ins now open at 6 PM instead of first thing in the morning, so you're reporting on your whole day - Fixed a timing bug in sleep trial reminders - Your trial calendar now clearly shows any day you missed, and you can tap it to fill it in - If you miss a day or two, you can still finish your trial instead of getting stuck — you'll get one chance to fill in what you remember before your results are calculated - Fixed a layout issue where the bottom of some screens felt cut off - Various small bug fixes and polish

App privacy

The developer, Paul Fenyves, reported these privacy practices to Apple.

Data Linked to You

The following data, which may be collected and linked to your identity, may be used for the following purposes:

  • Contact Info: Name

Used for: App Functionality

Data Not Linked to You

The following data, which may be collected but is not linked to your identity, may be used for the following purposes:

  • Health & Fitness: Health, Fitness
  • Contact Info: Email Address
  • User Content: Emails or Text Messages

Used for: Analytics, App Functionality

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