N1 TrialRun a trial on yourself
You stop drinking coffee after noon, and that week you sleep better. Was it the coffee? Maybe. Or maybe work was quieter, the evenings were cooler, or it was simply a good week. One week can’t tell you which. With the N1 Trial app you can test it scientifically: you plan it in a few minutes with an AI collaborator, the app measures every day for a few weeks, and at the end you get a well-founded estimate of how much difference the change made for you.
Why a trial: Correlation is not causation
Health trackers and apps are good at measuring, and some can show that two things moved together: you started taking magnesium, and your deep sleep went up. But life rarely holds still. In the same weeks you may also have gone to bed earlier, cut back on coffee or trained more, and any of those could be the real reason. Most apps stop at the pattern; N1 Trial tests it. An N-of-1 trial is the scientific way to single out one change and find out what it does for you.
Testing whether an evening walk helps you sleep? If you pick the evenings, you’ll probably walk when you have time and feel calm, and that helps you sleep too.
So the app draws lots for the evenings, and you end up walking on busy and calm evenings alike. If there’s still a difference, it’s most likely the walk that made it.
Studies tell you what works on average, but people respond differently.
one person in a study
Here you’re compared with yourself, on days with and without the change, so the answer is about you, not an average.
You get an estimate of the difference and of how sure it is.
most likely effect
the effect could be anywhere in this range
If it’s small, or too early to tell, we say so, which may save you sticking with a habit that makes little difference for you.
Want to know more about N-of-1 trials and how the analysis works?Read the full explanation
Tell your AI collaborator what you want to find out, and what counts as success. It suggests what to try and for how long. Or start from one of the ready-made trials in our catalogue.
Switch between days with and without the change. The app tracks how it’s going with data from your wearable, or from a quick daily check-in.
At the end, we compare your days with and without the change and let you know how likely it is that it made a difference for you.
Good to know
Sleep, movement, caffeine, routines, small changes to your day. The kind of question you would otherwise settle with a guess.
N1 Trial isn’t a medical device. The AI collaborator is built not to tell you to start, stop or change a prescription medication or a treatment you’re already on. Talk to your doctor about those.
Your trials, your health data and the AI conversation are stored and processed in the EU. We don’t sell data or share it with advertisers.
Read the privacy policyAbout
N1trials ApS is based in Aarhus, Denmark. We’re building N1 Trial so that anyone can answer everyday questions about their own life with a proper method, and an honest account of what the data can and can’t say.
Co-founder · Product and technology
Computer scientist from Aarhus University with 15 years of building software, including as co-founder and CTO of WorkTango, sold to Vista Equity Partners in 2022. N1 Trial is the third company he has co-founded, and he makes sure it is secure, private and easy to use. His own open question: do his morning exercises help his back?
Co-founder · Methods and data
PhD in Economics from the University of Copenhagen and a World Bank consultant. His research covers data integration and causal inference at the individual level. At N1 Trial, he focuses on methods, trial designs, and result interpretation. His own open question: does running, breathwork, or sauna affect his heart rate variability?
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Co-founder · Clinical insight · Part-time
Medical doctor with a PhD in pharmacoepidemiology, the study of how medicines work in real patients. Founder and CEO of Donor Network, board member of Novatech and an active investor. He advises N1 Trial on how trials are designed. His own open question: does meditating ten minutes three times a day sharpen his mind?
Get in touch
Write to us to ask about early testing, a collaboration, or the method.