N of 1 App
Your lab for self-improvement
Free · Designed for iPad. Not verified for macOS.
Stop guessing and find out what actually works for you. Run rigorous n-of-1 self-experiments on medications, supplements, and habits — and let the data decide.
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 side by side and tells you, in plain English, what actually changed in
your own data.
The science, without the lab coat
Daily check-ins take under 60 seconds. Results are shown as clear charts with a plain-English summary — no jargon,
no exaggerated claims. Just your numbers.
First trial: Magnesium Glycinate for Sleep
A 21-day structured experiment. One week of baseline sleep tracking, followed by two weeks of taking magnesium
glycinate before bed. You'll measure:
• Hours slept
• Time to fall asleep
• Number of awakenings
• Time spent awake
• Overall sleep quality
When your trial ends, you get a full results breakdown — averages, charts, and a verdict on what your data showed.
Morning reminders keep your streak going. Evening reminders prompt you to take your supplement. Your data stays
private.
More trials coming soon.
Ratings & Reviews
Updated App Name. Fixed handling of iPhone push notifications
The developer, Paul Fenyves, 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:
- Contact Info
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Health & Fitness
- Contact Info
- User Content
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Paul Fenyves
- Size
- 16 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
16+
- 16+
- Frequent
Medical Treatment information
Contains
Health or Wellness Topics
- Copyright
- © 2026 N of One App