Amazfit Helio Strap vs Polar Loop
The Amazfit Helio Strap is the better watch on paper: it lasts longer (10 days), adds skin temperature and tracks sleep in more depth. The Polar Loop doesn't beat it on any spec that matters.
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Key differences
-
Battery life
Evenly matched
Similar battery life: up to 10 days and 8 days.
-
GPS
Evenly matched
Both handle GPS the same way.
-
Display
Evenly matched
Neither has a screen: both show everything in the phone app.
-
Health
Amazfit Helio Strap wins
The Amazfit Helio Strap also measures skin temperature.
-
Weight
Evenly matched
Similar weight: 20 g and 19.5 g.
Other differences
- Sleep Amazfit Helio Strap wins
The Amazfit Helio Strap goes further on sleep, with a nightly sleep score.
Which one should you choose?
Choose the Amazfit Helio Strap if…
- You hate charging: it's rated for up to 10 days in smartwatch mode.
- You want more health data: it adds skin temperature.
- You want to sleep better: it scores each night and tells you what to change.
Choose the Polar Loop if…
- You want it to slide under a sleeve: it's 9 mm thick.
- You do lots of different sports: it has 150+ profiles.
Full spec comparison
The Amazfit Helio Strap leads on battery life and health tracking; elsewhere the two are closely matched.
Green cells with a ✓ mark the better spec in that row. Tick "Show differences only" to hide the rows where they match.
Overview
| Spec | Amazfit Helio Strap | Polar Loop |
|---|---|---|
| Brand | Amazfit | Polar |
| Series | Helio | — |
| Colours | Black | Night Black |
Platform & apps
Both work with the same phones and software.
| Spec | Amazfit Helio Strap | Polar Loop |
|---|---|---|
| Operating system | — | Polar |
| Works with | iPhone and Android | — |
| Minimum iOS | iOS 15 | — |
| Minimum Android | Android 7 | — |
| RAM | — | 1.3 MB |
| Storage | — | 0.016 GB |
| App store | — | No |
| Subscription | Not needed | Not needed |
Display
The screens are closely matched.
| Spec | Amazfit Helio Strap | Polar Loop |
|---|---|---|
| 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 slimmer, and the Amazfit Helio Strap doesn't beat it on anything here.
| Spec | Amazfit Helio Strap | Polar Loop |
|---|---|---|
| Case shape | Band | Band |
| Dimensions | 33.97 x 24.3 x 10.59 mm | 27 x 42 x 9 mm |
| Thickness | 10.59 mm | 9 mm |
| Weight (case) | 20 g | 19.5 g |
| Weight with band | — | 29 g |
| Case material | fiber-reinforced polymer | Stainless steel |
| Band material | Nylon | SoftWeave Textile |
| Band width | 22 mm | — |
| Fits wrists | 145-205 mm | 135-230 mm |
| Water resistance | 5 ATM | 3 ATM |
| Water standard | ISO 22810:2010 | — |
| Operating temperature | — | -20 to 50 °C |
Battery
The Amazfit Helio Strap is ahead on battery life.
It lasts longer (10 days), and the Polar Loop doesn't beat it on anything here.
| Spec | Amazfit Helio Strap | Polar Loop |
|---|---|---|
| Battery (smartwatch mode) | 10 days | 8 days |
| All battery modes | Smartwatch: 10 days | Smartwatch: 8 days |
| Battery capacity | 232 mAh | 170 mAh |
| Battery type | — | Li-Pol |
| Charging | puck | proprietary-plug |
GPS & navigation
Both handle location the same way.
| Spec | Amazfit Helio Strap | Polar Loop |
|---|---|---|
| GPS | Uses phone GPS | Uses phone GPS |
| Multi-band GPS | — | No |
Health & sensors
The Amazfit Helio Strap is ahead on health tracking.
It adds skin temperature and tracks sleep in more depth, and the Polar Loop doesn't beat it on anything here.
| Spec | Amazfit Helio Strap | Polar Loop |
|---|---|---|
| Sensors | optical HR, SpO2, skin temperature, accelerometer, gyroscope | optical HR, accelerometer |
| Heart-rate sensor | BioTracker 6.0 PPG | OHR GEN 3.5 |
| Heart-rate tracking | 24/7 | 24/7 |
| High/low heart-rate alerts | Yes | — |
| Heart-rate variability | Yes | Yes |
| Blood oxygen (SpO2) | Yes | — |
| Skin temperature | Yes | No |
| Respiration rate | — | Yes |
| Sleep tracking | Sleep score | Sleep stages |
| Stress tracking | Yes | — |
| Energy score | BioCharge | — |
| Readiness score | — | Nightly Recharge |
Training
The Polar Loop is ahead on training features.
It has more sport modes, and the Amazfit Helio Strap doesn't beat it on anything here.
| Spec | Amazfit Helio Strap | Polar Loop |
|---|---|---|
| Sport profiles | 50 | 150 |
| Auto activity detection | — | Yes |
| Swim tracking | — | None |
| Underwater heart rate | — | Yes |
| Training metrics | VO2 max, training load, training effect, recovery time | Training Load Pro, Training Benefit, Fitness Test |
| Strength rep counting | Yes | — |
| Heart-rate broadcast | Yes | No |
Smart features
Both offer much the same smart features.
| Spec | Amazfit Helio Strap | Polar Loop |
|---|---|---|
| Notifications | No | No |
| Bluetooth | Bluetooth 5.2 | Bluetooth LE |
Diving, golf & more
Neither has a specialist edge here.
| Spec | Amazfit Helio Strap | Polar Loop |
|---|---|---|
| Diving | None | — |