Fitbit Air vs Polar Loop
The Fitbit Air has the edge: it adds skin temperature and is lighter. The Polar Loop still lasts a little longer (8 days), so it's worth a look if that matters more to you.
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Key differences
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Battery life
Evenly matched
Similar battery life: up to 7 days and 8 days.
-
Health
Fitbit Air wins
The Fitbit Air also measures skin temperature.
-
Weight
Fitbit Air wins
The Fitbit Air is lighter: 5.2 g against 19.5 g.
Which one should you choose?
Choose the Fitbit Air if…
- You want more health data: it adds skin temperature.
- You wear it to bed or have small wrists: it weighs 5.2 g.
Choose the Polar Loop if…
- You'd like a bit more time between charges: it's rated for 8 days.
- You prefer its look and app: it covers the same essentials as the Fitbit Air.
Full spec comparison
The Fitbit Air leads on health tracking and size and durability; 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 | Fitbit Air | Polar Loop |
|---|---|---|
| Brand | Polar | |
| Series | Fitbit | — |
| Versions | Special Edition Stephen Curry, Special Edition Pokémon Sleep | — |
| Colours | Obsidian, Berry, Lavender, Fog, Rye, Sleepy Blue | Night Black |
Platform & apps
Both work with the same phones and software.
| Spec | Fitbit Air | Polar Loop |
|---|---|---|
| Operating system | Fitbit OS | Polar |
| Works with | iPhone and Android | — |
| Minimum iOS | iOS 16.4 | — |
| Minimum Android | Android 11 | — |
| RAM | — | 1.3 MB |
| Storage | — | 0.016 GB |
| App store | — | No |
| Software support | 2 years | — |
| Subscription | — | Not needed |
Display
The screens are closely matched.
| Spec | Fitbit Air | Polar Loop |
|---|---|---|
| Display type | — | None |
| Colour display | — | No |
| Always-on display | — | No |
| Touchscreen | — | No |
Design & durability
The Fitbit Air is ahead on size and durability.
It is lighter, and the Polar Loop doesn't beat it on anything here.
| Spec | Fitbit Air | Polar Loop |
|---|---|---|
| Case shape | Band | Band |
| Dimensions | 34.9 x 17 x 8.3 mm | 27 x 42 x 9 mm |
| Thickness | 8.3 mm | 9 mm |
| Weight (case) | 5.2 g | 19.5 g |
| Weight with band | 12 g | 29 g |
| Case material | Recycled polycarbonate and PBT plastics | Stainless steel |
| Band material | Textile with stainless steel buckle | SoftWeave Textile |
| Fits wrists | 130-210 mm | 135-230 mm |
| Water resistance | 5 ATM | 3 ATM |
| Operating temperature | — | -20 to 50 °C |
Battery
The Polar Loop is ahead on battery life.
It lasts a little longer (8 days), and the Fitbit Air doesn't beat it on anything here.
| Spec | Fitbit Air | Polar Loop |
|---|---|---|
| Battery (smartwatch mode) | 7 days | 8 days |
| All battery modes | Battery saver: 7 days | Smartwatch: 8 days |
| Battery capacity | — | 170 mAh |
| Battery type | Lithium-polymer | Li-Pol |
| Charging | USB-C | proprietary-plug |
| Full charge time | 90 min | — |
| Fast charging | 1 day of battery life in 5 min | — |
GPS & navigation
Both handle location the same way.
| Spec | Fitbit Air | Polar Loop |
|---|---|---|
| GPS | — | Uses phone GPS |
| Multi-band GPS | — | No |
Health & sensors
The Fitbit Air is ahead on health tracking.
It adds skin temperature, and the Polar Loop doesn't beat it on anything here.
| Spec | Fitbit Air | Polar Loop |
|---|---|---|
| Sensors | optical HR, accelerometer, gyroscope, SpO2, skin temperature | optical HR, accelerometer |
| Heart-rate sensor | — | OHR GEN 3.5 |
| Heart-rate tracking | 24/7 | 24/7 |
| Heart-rate variability | — | Yes |
| Blood oxygen (SpO2) | Yes | — |
| Skin temperature | Yes | No |
| Respiration rate | — | Yes |
| Sleep tracking | — | Sleep stages |
| Readiness score | — | Nightly Recharge |
Training
Training features are evenly matched.
| Spec | Fitbit Air | Polar Loop |
|---|---|---|
| Sport profiles | — | 150 |
| Auto activity detection | — | Yes |
| Swim tracking | — | None |
| Underwater heart rate | — | Yes |
| Training metrics | — | Training Load Pro, Training Benefit, Fitness Test |
| Heart-rate broadcast | — | No |
Smart features
Both offer much the same smart features.
| Spec | Fitbit Air | Polar Loop |
|---|---|---|
| Notifications | — | No |
| Bluetooth | Bluetooth 5.0 | Bluetooth LE |