Polar Loop vs WHOOP 5.0
The Polar Loop has the edge: it needs no membership and is lighter. The WHOOP 5.0 still adds skin temperature, so it's worth a look if that matters more to you.
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Key differences
-
GPS
Evenly matched
Both handle GPS the same way.
-
Display
Evenly matched
Neither has a screen: both show everything in the phone app.
-
Health
WHOOP 5.0 wins
The WHOOP 5.0 also measures skin temperature.
-
Weight
Polar Loop wins
The Polar Loop is lighter: 19.5 g against 26.5 g.
Other differences
- Subscription Polar Loop wins
The WHOOP 5.0 needs WHOOP Peak, a paid membership; the Polar Loop works without one.
Which one should you choose?
Choose the Polar Loop if…
- You'd rather not pay monthly: it works fully without a membership.
- You wear it to bed or have small wrists: it weighs 19.5 g.
- You want it to slide under a sleeve: it's 9 mm thick.
Choose the WHOOP 5.0 if…
- You want more health data: it adds skin temperature.
- You prefer its look and app: it covers the same essentials as the Polar Loop.
Full spec comparison
The Polar Loop leads on phone and software and size and durability, while the WHOOP 5.0 leads on health tracking.
Green cells with a ✓ mark the better spec in that row. Tick "Show differences only" to hide the rows where they match.
Overview
| Spec | Polar Loop | WHOOP 5.0 |
|---|---|---|
| Brand | Polar | WHOOP |
| Series | — | WHOOP |
| Released | — | 2025-08-27 |
| Replaces | — | WHOOP 4.0 |
| Colours | Night Black | — |
Platform & apps
The Polar Loop is ahead on phone and software.
It needs no membership, and the WHOOP 5.0 doesn't beat it on anything here.
| Spec | Polar Loop | WHOOP 5.0 |
|---|---|---|
| Operating system | Polar | other |
| RAM | 1.3 MB | — |
| Storage | 0.016 GB | — |
| App store | No | — |
| Subscription | Not needed | Required |
| Subscription name | — | WHOOP Peak |
Display
The screens are closely matched.
| Spec | Polar Loop | WHOOP 5.0 |
|---|---|---|
| Display type | None | None |
| Colour display | No | No |
| Always-on display | No | — |
| Touchscreen | No | No |
Design & durability
The Polar Loop is ahead on size and durability.
It is lighter and is slimmer, and the WHOOP 5.0 doesn't beat it on anything here.
| Spec | Polar Loop | WHOOP 5.0 |
|---|---|---|
| Case shape | Band | — |
| Dimensions | 27 x 42 x 9 mm | 34.7 x 24 x 10.6 mm |
| Thickness | 9 mm | 10.6 mm |
| Weight (case) | 19.5 g | 26.5 g |
| Weight with band | 29 g | — |
| Case material | Stainless steel | stainless steel and other durable, skin-safe metals |
| Band material | SoftWeave Textile | — |
| Fits wrists | 135-230 mm | — |
| Water resistance | 3 ATM | — |
| IP rating | — | IP68 |
| Operating temperature | -20 to 50 °C | 4 to 60 °C |
Battery
Battery life is close on both.
How you use the screen, GPS and notifications will matter more than the difference between them.
| Spec | Polar Loop | WHOOP 5.0 |
|---|---|---|
| Battery (smartwatch mode) | 8 days | — |
| All battery modes | Smartwatch: 8 days | Battery saver: 14 days |
| Battery capacity | 170 mAh | — |
| Battery type | Li-Pol | Li-ion |
| Charging | proprietary-plug | USB-C |
| Wireless charging | — | Yes |
| Full charge time | — | 152 min |
GPS & navigation
Both handle location the same way.
| Spec | Polar Loop | WHOOP 5.0 |
|---|---|---|
| GPS | Uses phone GPS | Uses phone GPS |
| Multi-band GPS | No | No |
Health & sensors
The WHOOP 5.0 is ahead on health tracking.
It adds skin temperature, and the Polar Loop doesn't beat it on anything here.
| Spec | Polar Loop | WHOOP 5.0 |
|---|---|---|
| Sensors | optical HR, accelerometer | optical HR, accelerometer, skin temperature |
| Heart-rate sensor | OHR GEN 3.5 | photoplethysmography (PPG) sensor |
| Heart-rate tracking | 24/7 | 24/7 |
| ECG | — | No |
| Irregular rhythm alerts | — | No |
| Heart-rate variability | Yes | Yes |
| Blood oxygen (SpO2) | — | Yes |
| Skin temperature | No | Yes |
| Respiration rate | Yes | Yes |
| Blood pressure | — | None |
| Sleep tracking | Sleep stages | Sleep stages |
| Stress tracking | — | Yes |
| Readiness score | Nightly Recharge | Recovery |
| Cycle tracking | — | Yes |
Safety
Both offer much the same safety features.
| Spec | Polar Loop | WHOOP 5.0 |
|---|---|---|
| Siren | — | No |
Training
Training features are evenly matched.
| Spec | Polar Loop | WHOOP 5.0 |
|---|---|---|
| Sport profiles | 150 | — |
| Auto activity detection | Yes | — |
| Swim tracking | None | — |
| Underwater heart rate | Yes | — |
| Training metrics | Training Load Pro, Training Benefit, Fitness Test | — |
| Adaptive coaching | — | Yes |
| Heart-rate broadcast | No | — |
Smart features
Both offer much the same smart features.
| Spec | Polar Loop | WHOOP 5.0 |
|---|---|---|
| Notifications | No | Yes |
| Message replies | — | None |
| Speaker | — | No |
| Microphone | — | No |
| Voice assistant | — | None |
| Bluetooth | Bluetooth LE | — |
| Flashlight | — | No |
Diving, golf & more
Neither has a specialist edge here.
| Spec | Polar Loop | WHOOP 5.0 |
|---|---|---|
| Diving | — | None |