Home · Compare · Polar vs Withings

Polar vs Withings

Polar reads HRV, recovery, and training load from the chest. Withings reads body composition, blood pressure, and sleep apnea screening from the bathroom and the bedroom.

POLAR 17/27API signals exposed Sport watch / chest strap

withings 20/27API signals exposed Scale, BP monitor, watch

QUICK VERDICT

Polar is for the workout. Withings is for the rest of the day. Combined they fill very different gaps: Polar's RMSSD HRV during training, Withings' muscle mass and blood pressure trends week over week. Neither replaces the other — and neither is the right primary device on its own for someone training seriously and tracking long-term health.

COVERAGE BY CATEGORY

Where each brand actually wins

Per-category breakdown of API signals.

Heart & Vitals

Polar 5/8

Withings 8/8

Sleep

Polar 3/3

Withings 3/3

Activity

Polar 5/6

Withings 5/6

Fitness & Recovery

Polar 3/6

Withings 0/6

Body Composition

Polar 1/4

Withings 4/4

SIGNAL BY SIGNAL

The full matrix

Signal	Polar	Withings
Heart & Vitals
Resting HR	✓	✓
HRV	✓	✓
SpO2	✓	✓
Respiratory Rate	✓	✓
Skin Temperature	✓	✓
Body Temperature	—	✓
Blood Pressure	—	✓
ECG · AFib	—	✓
Sleep
Sleep duration	✓	✓
Sleep stages	✓	✓
Sleep score	✓	✓
Activity
Steps	✓	✓
Active minutes	✓	✓
Calories	✓	✓
Activities	✓	✓
Floors climbed	—	—
Distance	✓	✓
Fitness & Recovery
VO2max	✓	—
Training load	✓	—
Recovery / Readiness	✓	—
Body Battery	—	—
Stress (continuous)	—	—
Cardiovascular age	—	—
Body Composition
Weight	✓	✓
Body fat %	—	✓
Muscle mass	—	✓
Hydration	—	✓

Verified against vendor developer documentation.

WHICH ONE FOR YOU

Pick the one that matches your priority

POLAR

Pick Polar if

Endurance training is your priority
You compete and need accurate workout HRV
Recovery score and training load drive your week

withings

Pick Withings if

Long-term body composition matters
Blood pressure or apnea screening matter
You don't want anything strapped to your chest

POLAR+withings

Pick both if

Polar chest strap during structured sessions
Withings scale every morning, BP monitor weekly
Most complementary pair across the live providers

FAQ

Frequently asked questions

Can I use Polar and Withings together?

Yes, and they complement each other. Withings measures what a watch cannot on its own, body composition from a smart scale, blood pressure, and on some models an ECG. Many people keep Polar for daily tracking and add a Withings device for the rest.

Which one tracks more health signals?

Polar tracks 17 of the 27 signals I compare, Withings tracks 20. The matrix above breaks it down by category, and they often win different categories.

Which one should I get first?

Start with whichever covers your main goal. For daily heart rate, sleep and workouts, go with Polar. For weight, body composition and blood pressure, go with Withings. You can add the other later.

How did you compare Polar and Withings?

From each brand's official spec sheets and support pages, cross-checked against independent reviews like DC Rainmaker and The Quantified Scientist and peer-reviewed accuracy studies. Signal-level edge cases are noted in the matrix, not hidden behind a single check mark.

WHERE TO BUY