Polar Loop vs WHOOP MG - Clinical Comparison

Name: WHOOP MG
Brand: WHOOP
Price: 359 USD
Rating: 92

Compare Polar Loop and WHOOP MG side-by-side with clinical performance scores, FDA status, pricing, and expert recommendations

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Polar Loop

85 /100

WHOOP MG

92 /100

+8% higher overall score

Polar Loop

Polar

Score

Price

$200

Evidence

Limited Studies

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Top Rated

WHOOP MG

WHOOP

Score

Price

$359

Evidence

Moderate

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Performance Metrics

Polar Loop

WHOOP MG

Performance Metrics

Polar Loop

WHOOP MG

Measurement Accuracy

Evaluates accuracy, repeatability, and reliability of heart rate, sleep, activity, blood pressure, SpO2, HRV, stress, and recovery measurements, including comparisons with appropriate references when available.

The published sensor list is optical heart rate and an accelerometer, feeding sleep stages, Nightly Recharge, and Training Load Pro. That is a coherent set, and it is a short one. No SpO2, no skin temperature, and no ECG appear on Polar's spec sheet. The 84 is the lowest accuracy score but one in this group for that reason. Medgrade did not compare the optical heart rate with a chest strap.

The MG's optical set covers heart rate, HRV, sleep, skin temperature, and blood oxygen, and the ECG used for on-demand AFib screening is FDA-cleared. Blood Pressure Insights remains a wellness trend: the FDA's closeout letter covers the feature only as modified, and it is not a validated cuff. This 94 reflects that sensor set and the ECG clearance. Medgrade did not run a cuff or chest-strap comparison for this review.

+11% better measurement accuracy

Measurement Accuracy

+11% better

App Experience

Evaluates companion-app usability, dashboards, visualization, trends, reporting, insights, integrations, connectivity, and data synchronization reliability.

Polar Flow includes the sleep and training views and does not charge for them. Starting a workout means opening the app, because the band has no button and no screen. The optional Fitness Program is a paid plan on top. Flow is enough for the metrics Polar actually records. It does not have Garmin's training-status stack or WHOOP's ECG export.

The WHOOP app is the entire interface. It shows strain, recovery, sleep, and Healthspan, and an ECG can be exported as a PDF. Membership is what unlocks it. There is no on-wrist screen to fall back on when the phone is away.

+10% better app experience

App Experience

Evaluates companion-app usability, dashboards, visualization, trends, reporting, insights, integrations, connectivity, and data synchronization reliability.

+10% better

Hardware & Wearability

Evaluates construction, durability, sensor contact, comfort during daily wear and sleep, straps, battery life, charging, water resistance, and ergonomics.

Two SoftWeave sizes in the box, a steel case, WR30, and 8 days from a 170 mAh battery. Weight with the band is 29 g, heavier than CIRQA's module-plus-strap and much heavier than Fitbit Air. Eight days sits between Fitbit's 7 and Garmin's 10. Four weeks of onboard memory is a practical plus if the phone stays behind.

WHOOP states 14 or more days of battery, an IP68 rating to 10 meters, and a band about 7 percent smaller than the prior model. The clasp-style sensor is built for 24-hour wear, including sleep. Straps beyond the one in the membership are a separate purchase, and the band charges in a PowerPack rather than from a simple cable on the wrist.

+8% better hardware & wearability

Hardware & Wearability

Evaluates construction, durability, sensor contact, comfort during daily wear and sleep, straps, battery life, charging, water resistance, and ergonomics.

+8% better

Overall Value

Evaluates purchase price, subscriptions, included features and accessories, warranty, recurring costs, and competitiveness against alternatives.

The fee story is the strong part: $199.99 once, a free app, and a stated 2-year guarantee. The weak part is what that money buys next to CIRQA at the same price. CIRQA adds Pulse Ox, skin temperature, VO2 max, and a lighter module. Loop's 87 is the no-fee purchase, discounted for the shorter spec sheet.

+1% better overall value

Year-one cost is $359, and the same amount is due each year the membership continues. Over three years that is $1,077 before any extra strap. The ECG and the depth of the app are what the fee buys. Bands in this comparison that sell the hardware once, with no required fee, score higher on value even when their sensor list is shorter.

Overall Value

Evaluates purchase price, subscriptions, included features and accessories, warranty, recurring costs, and competitiveness against alternatives.

+1% better

Clinical Efficacy

Polar Loop

WHOOP MG

Clinical Efficacy

Polar Loop

WHOOP MG

Heart rate

Optical heart rate through the day and during a workout.

Continuous optical heart rate. WHOOP says the sensor samples 26 times a second.

+100% better heart rate

Heart rate

Optical heart rate through the day and during a workout.

+100% better

Sleep tracking

Sleep duration and stages, including time awake in bed.

Sleep stages feed the recovery score in the WHOOP app.

+100% better sleep tracking

Sleep tracking

Sleep duration and stages, including time awake in bed.

+100% better

Recovery and HRV

Heart-rate variability and the readiness score built from it.

Strain and recovery are the center of the membership.

+100% better recovery and hrv

Recovery and HRV

Heart-rate variability and the readiness score built from it.

+100% better

Overnight vitals

SpO2, skin temperature, and any blood-pressure trend.

SpO2, skin temperature, and Blood Pressure Insights as a trend, not a cuff.

+100% better overnight vitals

Overnight vitals

SpO2, skin temperature, and any blood-pressure trend.

+100% better

Specifications

Specification	Polar Loop	WHOOP MG
Price	$200	$359
FDA Status	Not FDA Regulated	FDA 510(k) Cleared
Clinical Evidence	Limited Studies	Moderate Clinical Evidence
Clinical Recommendation	Worth Considering	Recommended
Connectivity	bluetooth	bluetooth

Value for Money

85 score / $200

42.5

value score

66% better value

92 score / $359

25.6

value score

Value score = Performance score ÷ Price × 100

Polar Loop

Strengths

✓ $199.99 once, with Polar Flow free and a stated 2-year guarantee.
✓ Nightly Recharge, Sleep Plus Stages, SleepWise, and Training Load Pro from Polar's optical heart-rate history.
✓ Up to 8 days of battery and about four weeks of data stored on the band.
✓ Two SoftWeave wrist ranges in the box, plus WR30 water resistance.

Limitations

× No SpO2, skin temperature, or ECG on the published spec sheet.
× No screen and no button, so a workout starts in the app or by automatic detection.
× At $199.99 it matches CIRQA's price with fewer published sensors and a heavier band.

WHOOP MG

Strengths

✓ FDA-cleared ECG for on-demand AFib screening.
✓ 14 or more days of battery, rated IP68 to 10 meters.
✓ Strain, recovery, sleep, HRV, and blood oxygen in the app.

Limitations

× $359 a year. The band stops if the membership ends.
× Blood Pressure Insights is a trend estimate, not a cuff. ECG excludes under-22s and pacemakers.

Expert Review Summary

Our clinical assessment and verdict for each device

Polar Loop

Worth Considering

"A one-time $199.99 for Polar heart rate, sleep, and recovery, without the sensors the pricier rivals publish."

Polar Loop scores 85/100: Overall Value 87, Hardware and Wearability 85, App Experience 85, Measurement Accuracy 84. Polar launched it on September 3, 2025 at $199.99 with no required subscription. The spec sheet lists Precision Prime optical heart rate, an accelerometer, 8 days of battery, WR30, and a stainless steel case. Polar Flow adds Nightly Recharge, Sleep Plus Stages, and Training Load Pro at no fee. SpO2, skin temperature, and ECG are absent from the published sensor list. The 85 is an editorial score of that sheet, not a Medgrade wearing trial.

Limited Studies

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WHOOP MG

Recommended

"An FDA-cleared wrist ECG and a mature recovery app, tied to a $359 yearly membership that you cannot skip."

WHOOP MG scores 92/100 on the four comparison categories: Measurement Accuracy 94, App Experience 94, Hardware and Wearability 92, and Overall Value 86. WHOOP announced the band on May 8, 2025 as the hardware for WHOOP Life. The company states 14 or more days of battery life, continuous heart rate, HRV, sleep, skin temperature, and blood oxygen, and an FDA-cleared ECG for AFib screening in adults 22 and older who do not have a pacemaker. Blood Pressure Insights is a separate wellness trend. The FDA warned WHOOP about that feature on July 14, 2025, then closed the warning after WHOOP changed the product and its labeling. The closeout is not a clearance to diagnose hypertension. The 92 is an editorial score of those published facts. It is not a second copy of the 12-week, eight-user protocol used for the Oxiline Band XS Pro.

Moderate Clinical Evidence

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Where to Buy

Verified purchase options and current availability

Polar Loop

$200 MSRP

Polar

$199.99

Polar lists delivery at about 5 to 7 business days on the US product page. $199.99. Free Polar Flow app. Optional Polar Fitness Program is a separate training-plan subscription and is not required to use the band. 2-year guarantee.

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Manufacturer Site

HSA/FSA: Not Typically Eligible

WHOOP MG

Top Choice

$359 MSRP

WHOOP

$359.00

Membership signup on WHOOP. Delivery depends on WHOOP at the time of order. The $359 charge is one year of WHOOP Life, which includes the MG. It is not a one-time hardware price. The membership renews yearly. Multi-year prepay discounts have been offered; confirm the current rate at checkout. Extra bands cost more.

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Manufacturer Site

HSA/FSA: Not Typically Eligible

Important Purchase Considerations

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