Fitbit Inspire 3 vs Fitbit Air
Both are good picks with different strengths. The Fitbit Inspire 3 lasts longer (10 days), while the Fitbit Air is lighter and is slimmer.
We earn a commission from qualifying Amazon purchases made through our links, at no extra cost to you. This never affects our specs. How we make money.
Key differences
-
Battery life
Fitbit Inspire 3 wins
The Fitbit Inspire 3 lasts up to 10 days against 7 days.
-
Health
Evenly matched
Much the same health sensors.
-
Weight
Fitbit Air wins
The Fitbit Air is lighter: 5.2 g against 17.69 g.
Which one should you choose?
Choose the Fitbit Inspire 3 if…
- You hate charging: it's rated for up to 10 days in smartwatch mode.
- You prefer its look and app: it covers the same essentials as the Fitbit Air.
Choose the Fitbit Air if…
- You wear it to bed or have small wrists: it weighs 5.2 g.
- You want it to slide under a sleeve: it's 8.3 mm thick.
Full spec comparison
The Fitbit Inspire 3 leads on battery life, while the Fitbit Air leads on size and durability.
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 Inspire 3 | Fitbit Air |
|---|---|---|
| Brand | ||
| Series | Inspire | Fitbit |
| Versions | — | Special Edition Stephen Curry, Special Edition Pokémon Sleep |
| Colours | Midnight Zen, Lilac Bliss, Morning Glow | Obsidian, Berry, Lavender, Fog, Rye, Sleepy Blue |
Platform & apps
Both work with the same phones and software.
| Spec | Fitbit Inspire 3 | Fitbit Air |
|---|---|---|
| Operating system | — | Fitbit OS |
| Works with | iPhone and Android | iPhone and Android |
| Minimum iOS | iOS 16.4 | iOS 16.4 |
| Minimum Android | Android 11 | Android 11 |
| Software support | 2 years | 2 years |
Display
The screens are closely matched.
| Spec | Fitbit Inspire 3 | Fitbit Air |
|---|---|---|
| Display type | AMOLED | — |
| Resolution | 124 x 208 | — |
| Colour display | Yes | — |
| Always-on display | Yes | — |
Design & durability
The Fitbit Air is ahead on size and durability.
It is lighter and is slimmer, and the Fitbit Inspire 3 doesn't beat it on anything here.
| Spec | Fitbit Inspire 3 | Fitbit Air |
|---|---|---|
| Case shape | — | Band |
| Dimensions | 39.32 x 18.6 x 11.75 mm | 34.9 x 17 x 8.3 mm |
| Thickness | 11.75 mm | 8.3 mm |
| Weight (case) | 17.69 g | 5.2 g |
| Weight with band | — | 12 g |
| Case material | — | Recycled polycarbonate and PBT plastics |
| Lens | Corning Gorilla Glass 3 | — |
| Band material | silicone | Textile with stainless steel buckle |
| Fits wrists | 130-220 mm | 130-210 mm |
| Water resistance | 5 ATM | 5 ATM |
| IP rating | IP68 | — |
| Operating temperature | 0 to 40 °C | — |
| Max altitude | 8,534 m | — |
Battery
The Fitbit Inspire 3 is ahead on battery life.
It lasts longer (10 days), and the Fitbit Air doesn't beat it on anything here.
| Spec | Fitbit Inspire 3 | Fitbit Air |
|---|---|---|
| Battery (smartwatch mode) | 10 days | 7 days |
| All battery modes | Battery saver: 10 days | Battery saver: 7 days |
| Battery type | Lithium-polymer | Lithium-polymer |
| Charging | — | USB-C |
| Full charge time | 120 min | 90 min |
| Fast charging | — | 1 day of battery life in 5 min |
GPS & navigation
Both handle location the same way.
| Spec | Fitbit Inspire 3 | Fitbit Air |
|---|---|---|
| GPS | Uses phone GPS | — |
| Multi-band GPS | No | — |
Health & sensors
Both track much the same health data.
Heart rate, sleep and the extra sensors line up closely.
| Spec | Fitbit Inspire 3 | Fitbit Air |
|---|---|---|
| Sensors | accelerometer, optical HR, SpO2, ambient light, thermometer | optical HR, accelerometer, gyroscope, SpO2, skin temperature |
| Heart-rate tracking | 24/7 | 24/7 |
| Heart-rate variability | Yes | — |
| Blood oxygen (SpO2) | Yes | Yes |
| Skin temperature | Yes | Yes |
Smart features
Both offer much the same smart features.
| Spec | Fitbit Inspire 3 | Fitbit Air |
|---|---|---|
| Notifications | Yes | — |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.0 |