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
- 24/7optical HRV
- 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 validate our medical-grade optical read against reference equipment, and 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 medical-grade optics matter
The bracelet's high-precision optical sensors read the pulse wave (PPG), HRV, SpO₂ and temperature straight from the wrist — validated against reference equipment so the measurements hold up. When you want a true electrocardiogram, the WitU ecosystem records real ECG through the Patch and Chest Strap.
- PPG, HRV, SpO₂ and temperature from the wrist
- Validated against reference equipment
- Real ECG available across the ecosystem
How we verify it
No marketing — just a repeatable path from data to conclusion.
We collect data
Two years of continuous optical PPG, HRV, and sleep collection with real users and in clinics.
We check against a reference
The optical signal is validated against reference equipment — we measure real 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 · HRVOptics and the ecosystem ECG
How the bracelet's medical-grade optics read PPG, HRV and SpO₂ — and where real ECG comes in via the Patch and Chest Strap.
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.