| Display | Color OLED, 333 ppi, DCI-P3, Corning Gorilla Glass 3 | 1.5" AMOLED, 480 x 480, 323 PPI, tempered glass |
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| Battery | Up to 16 hours (328 mAh typical); about 30 minutes to 60%, about 70 minutes to 100% | Up to 14 days typical use (up to 5 days with always-on display), 475 mAh |
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| Case | 41.04 x 44.89 x 13.35 mm, 28.03 g without band; band fits 120-200 mm wrists | 46 x 46 x 10.6 mm, aluminum alloy middle frame, fiber-reinforced polymer bottom shell, 35 g without strap |
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| Water Resistance | Water resistant to 50 m | 5 ATM |
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| Connectivity | Built-in 4G LTE (Fitbit Ace Pass subscription required), Wi-Fi 802.11 b/g/n 2.4GHz, Bluetooth 5.0, NFC (Tap to Pay), GPS/GNSS | Wi-Fi 2.4GHz, Bluetooth 5.0, Bluetooth phone calls |
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| Sensors | Accelerometer, optical heart rate sensor, altimeter, magnetometer, ambient light sensor, gyroscope | BioTracker 5.0 PPG (8PD + 2LED), BIA bioelectric impedance, accelerometer, gyroscope, geomagnetic, barometric, ambient light, temperature |
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| Audio | Built-in microphone and speaker | — |
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| Compatibility | Fitbit Ace app on Android 11 or newer or iOS 16 or newer | Android 7.0+, iOS 14.0+ |
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| Target age | Kids 7 and up | — |
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| GPS | — | Dual-band GPS, 6 satellite systems, offline maps |
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| Storage | — | Music storage up to 2.2GB |
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| OS | — | Zepp OS 3.0 at launch (later Zepp OS 3.5 / 4) |
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