Evidence-based —
no promises of miracles
Two years of research, sensor validation, and a foundation in peer-reviewed science. We explain how and why WitU's measurements work.
- 2 yearsof research
- 500 HzECG signal
- 12+biomarkers
How we work with data
Evidence-based
Every claim rests on peer-reviewed research and our own validation data. Sources are in every article.
Accuracy first
We measure ECG rather than estimating heart rate from light. The DCI index shows how much the data can be trusted.
Transparency
We're honest that WitU is a wellness wearable, not a medical device, and we don't promise miracles. Only what the data confirms.
Why we measure ECG, not light
Optical PPG sensors estimate heart rate from reflected light and lose up to 40% of the signal during motion. Two dry electrodes record a true electrocardiogram — the same principle used in a cardiologist's office.
- A direct electrical signal, not an indirect estimate
- Stable under load and in motion
- 500 Hz — a clinical sampling rate
How we verify it
No marketing — just a repeatable path from data to conclusion.
We collect data
Two years of continuous ECG, HRV, and sleep collection with real users and in clinics.
We check against a reference
The signal is validated against a clinical ECG — we measure the channel's accuracy, not the marketing.
We rely on science
Algorithms are built on peer-reviewed research. Every piece of material cites its sources.
We show confidence
The DCI index transparently reflects how much the data can be trusted at any given moment.
What we research
Each area is a package of material with sources. Start with whatever is closest to your goal.
Heart rate variability
HRV as a marker of stress, recovery, and burnout. RMSSD, SDNN, and nervous-system balance.
Cluster · HRVECG vs. optics
Why electrodes are more accurate than PPG sensors and what that changes for measurements under load.
TechnologySleep and recovery
Sleep stages, the Recovery Score, and the link between sleep quality and cognitive function.
Cluster · SleepNutrition and biomarkers
Evidence-based supplement selection from blood tests instead of questionnaires.
Cluster · NutrientsDevice comparison
An objective breakdown of WitU versus Whoop, Oura, and Apple Watch on the things that matter.
ReviewsReferences
WitU's material rests on peer-reviewed science. The key sources behind our research:
Insights are provided for general wellness and informational purposes only and are not intended to diagnose, treat, or replace professional medical advice. If you have any health concerns, consult a qualified healthcare provider.