| Battery | Up to 7 days (Fitbit estimate, default settings) | Up to 16 hours (328 mAh typical); about 30 minutes to 60%, about 70 minutes to 100% |
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| Sensors | Heart rate with machine-learning algorithm (up to 60% more accurate than Charge 5 in HIIT, spinning and rowing per Fitbit), ECG app (select countries), EDA stress scan, SpO2, heart rate variability, breathing rate | Accelerometer, optical heart rate sensor, altimeter, magnetometer, ambient light sensor, gyroscope |
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| Navigation | Built-in GPS; Google Maps turn-by-turn directions | — |
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| Features | Google Wallet contactless payments, YouTube Music controls (Premium subscription), 40+ exercise modes, heart rate broadcast to compatible gym equipment over encrypted Bluetooth, Zoom + Magnification accessibility feature | — |
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| Controls | Haptic side button | — |
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| Compatibility | Android 9.0 or newer, iOS 15 or newer, Google Account required | Fitbit Ace app on Android 11 or newer or iOS 16 or newer |
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| Subscription | 6 months of Fitbit Premium included with device | — |
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| Colors | Obsidian, Porcelain, Coral | — |
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| Display | — | Color OLED, 333 ppi, DCI-P3, Corning Gorilla Glass 3 |
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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 |
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| Water Resistance | — | Water resistant to 50 m |
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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 |
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| Audio | — | Built-in microphone and speaker |
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| Target age | — | Kids 7 and up |
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