Oura - Ring 5 - Smart Ring - Size Before You Buy with OR5 Sizing Kit - Size 11 - Silver - (2026) vs PulseRive Blood Pressure Monitoring Smart Rings. - Electronics: which is safer?

Oura - Ring 5 - Smart Ring - Size Before You Buy with OR5 Sizing Kit - Size 11 - Silver - (2026) is the clear pick. Withings PulseRive Blood Pressure Monitoring Smart Rings. - Electronics carries a failing PFAS grade, and we never recommend buying a failing product.

Our pick

Fitbit

Oura - Ring 5 - Smart Ring - Size Before You Buy with OR5 Sizing Kit - Size 11 - Silver - (2026)

PFAS grade

B 85/100

Overall grade

D 67/100

Verdict

Buy

Hazard flags

⚑ 3

Material

Titanium and stainless steel with glass sensor

Confidence

72%

PossibleElectronic component off-gassing or thermal breakdown

ReportedBiofilm and bacterial growth on sensor surfaces

PossibleGlass or metal micro-debris from wear

Why this gradeBuy

Withings

PulseRive Blood Pressure Monitoring Smart Rings. - Electronics

PFAS grade

F 40/100

Overall grade

F 28/100

Verdict

Skip

Hazard flags

⚑ 3

Material

Stainless steel ring with waterproof/water-resistant electronics coating

Confidence

35%

PossibleWaterproof coating composition (PFAS or alternative) undisclosed

PossibleNickel leaching from stainless steel

PossibleAdhesive or battery sealant toxins (if seal fails)

Why this grade

Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →

More waterproof smart rings & bands: see the full ranking