Amazfit GTS 4 vs Google Fitbit Air
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At a glance
Key specifications and important differences. Full details follow below.
| Feature |  Amazfit GTS 4 |  Google Fitbit Air |
|---|---|---|
| Price | KSh 18,500.00 | KSh 21,500.00 |
| Display | 1.75-inch AMOLED | — |
| Battery capacity | 300 mAh rated | — |
| Water resistance | 5 ATM | Water-resistant to 50 m; dry the band after exposure to water |
| Operating system | Zepp OS 2.0 | — |
| Network / cellular | No cellular connection | — |
| Positioning / GNSS | Dual-band, circularly polarized GNSS supporting six satellite systems | — |
| Health & wellness features | 24-hour heart rate, blood oxygen and stress; one-tap measurement; readings are not medical diagnoses | Heart rate, SpO2, skin-temperature variation and fitness tracking; wellness data is not a medical diagnosis |
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Full specifications
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Identity & design
| Specification | Amazfit GTS 4 | Google Fitbit Air |
|---|---|---|
| Brand | Amazfit | — |
| Model | GTS 4 | Fitbit Air |
| Announced | September 2022 | — |
| Dimensions | 42.7 × 36.5 × 9.9 mm without heart-rate sensor base | 34.9 × 17 × 8.3 mm without band |
| Weight | 27 g without strap | 5.2 g without band; 12 g with band |
| Build materials | Aluminum-alloy middle frame; high-gloss sprayed polycarbonate bottom shell | Recycled polycarbonate and PBT plastic tracker housing |
| Wrist size | 140–200 mm | 130–210 mm textile; 130–175 mm small silicone or 165–210 mm large silicone |
| Strap / band | 20 mm quick-release fluoroelastomer or nylon strap | Textile and polyurethane band with stainless-steel buckle; silicone small and large bands are also supported. |
| Controls / buttons | Touchscreen and stainless-steel navigation crown | Screenless tracker with vibration feedback and an LED status light; configuration and detailed results are managed in the Google Health app. |
Display
| Specification | Amazfit GTS 4 | Google Fitbit Air |
|---|---|---|
| Display | 1.75-inch AMOLED | — |
| Screen resolution | 390 × 450 pixels, 341 ppi | — |
| Display protection | Tempered glass with anti-fingerprint coating | — |
| Display features | Always-on display; 150+ watch faces | — |
Performance & software
| Specification | Amazfit GTS 4 | Google Fitbit Air |
|---|---|---|
| Operating system | Zepp OS 2.0 | — |
Connectivity
| Specification | Amazfit GTS 4 | Google Fitbit Air |
|---|---|---|
| Network / cellular | No cellular connection | — |
| SIM / eSIM | No SIM or eSIM | — |
| Wi-Fi | 2.4 GHz Wi‑Fi | — |
| Bluetooth | Bluetooth 5.0 and BLE | Bluetooth 5.0 BLE; syncing range up to 9 m; synchronization requires an internet connection and phone location permission. |
| Positioning / GNSS | Dual-band, circularly polarized GNSS supporting six satellite systems | — |
Audio & communication
| Specification | Amazfit GTS 4 | Google Fitbit Air |
|---|---|---|
| Speaker | Built-in speaker | — |
| Microphone | Built-in microphone | — |
| Calling | Bluetooth calling when paired | — |
Sensors, health & fitness
| Specification | Amazfit GTS 4 | Google Fitbit Air |
|---|---|---|
| Sensors | BioTracker 4.0 PPG, accelerometer, gyroscope, geomagnetic, barometric altimeter and ambient-light sensor | Optical heart-rate sensor, red and infrared SpO2 sensors, and skin-temperature sensor |
| Health & wellness features | 24-hour heart rate, blood oxygen and stress; one-tap measurement; readings are not medical diagnoses | Heart rate, SpO2, skin-temperature variation and fitness tracking; wellness data is not a medical diagnosis |
| Sleep tracking | Sleep stages including REM, naps, breathing quality and sleep score | Sleep duration and health insights through Google Health |
| Sports / workout modes | 154 modes; automatic recognition of eight sports and strength exercises | Automatic and app-started workout tracking |
| Training & outdoor features | Route import, real-time navigation, track-run mode and PeakBeats training status | Live heart-rate broadcast to compatible gym equipment, Cardio Load, Active Zone Minutes, phone-connected GPS and post-workout pace and heart-rate zones in Workout Intensity Map. |
| Diving / depth features | Not rated for diving | — |
Battery & durability
| Specification | Amazfit GTS 4 | Google Fitbit Air |
|---|---|---|
| Battery capacity | 300 mAh rated | — |
| Battery life | Up to 8 days typical, 4 days heavy, 16 days saver; GPS up to 16/28/33 hours by mode | Up to 7 days |
| Charging | Magnetic charging, approximately 2 hours | USB-C charging cable |
| Water resistance | 5 ATM | Water-resistant to 50 m; dry the band after exposure to water |
| Durability / certifications | ISO 22810:2010 5 ATM; suitable for swimming, not hot showers or sauna | — |
Compatibility
| Specification | Amazfit GTS 4 | Google Fitbit Air |
|---|---|---|
| Phone compatibility | Android 7.0+ or iOS 12.0+ | Google Account and Google Health app required; Android 11.0+ or iOS 16.4+ |
| Companion app | Zepp app | Google Health app |
| Colors | Infinite Black, Misty White, Autumn Brown, Rosebud Pink | Obsidian, Berry, Lavender or Fog; special editions vary |
Additional specifications
| Specification | Amazfit GTS 4 | Google Fitbit Air |
|---|---|---|
| Vibration motor | — | Vibration motor |
| Charging time | — | 90 minutes; 5-minute quick charge provides up to 1 day |
| Movement sensors | — | 3-axis accelerometer and gyroscope |
| Bluetooth and Wi-Fi | — | Bluetooth 5.0; Bluetooth LE sync up to 9 m |
| Packing list | — | Google Fitbit Air tracker, wristband and USB-C charging cable |
| Smart recognition | — | Automatically detects common activities |
| Energy, load and readiness features | — | Personalized insights available through Google Health and optional Google Health Premium |
| strap material | — | Textile performance band with stainless-steel buckle; silicone bands optional |
| temperature monitoring | — | Skin-temperature variation in the Google Health app |
| offline storage | — | 7 days of detailed minute-by-minute motion data and 30 days of daily totals |
| packaging materials | — | 100% plastic-free packaging |
| Positioning / GPS | — | Phone-connected GPS through the Google Health app; Fitbit Air does not have built-in GPS. |
| Health & wellness features | — | 24/7 heart rate, resting heart rate, heart-rate variability, breathing rate, blood oxygen (SpO2), skin-temperature variation, steps, distance, calories, Active Zone Minutes, Cardio Load and Readiness; Google Health also supports weight, nutrition, water, mood and cycle logging. |
| Sleep tracking | — | Sleep Score, sleep schedule, sleep duration and sleep stages; Smart Wake uses sleep movement and heart rate to wake during a lighter sleep stage; adaptive sleep coaching requires Google Health Premium. |
| Sports / workout modes | — | Automatic detection for walking, running, cycling, sports, elliptical, rowing machine and stationary bike; manual and app-started workout tracking is also supported. |
| Smart features / notifications | — | Vibration and LED battery/status alerts, optional phone notifications, Fast Pair on Android and multi-device support with a compatible Pixel Watch. |
| Charging | — | Magnetic USB-C charging cable; 0–100% in 90 minutes; a 5-minute quick charge provides up to one day of battery life. |
| Colors | — | Obsidian with Matte Black buckle; Berry with Polished Champagne Gold buckle; Lavender or Fog with Polished Silver buckle; Stephen Curry Rye/Pyrite and Pokémon Sleep Sleepy Blue special editions. |
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