| Battery | Up to 7 days (Fitbit estimate, default settings) | Up to 8 days, 170 mAh Li-Pol, USB-C charging cable |
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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 | Polar Precision Prime optical heart-rate sensor (OHR Gen 3.5), accelerometer; no skin temperature sensing |
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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 | — |
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| Subscription | 6 months of Fitbit Premium included with device | — |
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| Colors | Obsidian, Porcelain, Coral | Greige Sand, Night Black, Brown Copper; extra bands USD 29.90 |
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| Display | — | None - screen-free band with no buttons; data is shown in the Polar Flow app |
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| Body | — | Stainless steel sensor unit, 42 x 27 x 9 mm; 29 g with band (19.5 g without band); SoftWeave band in S/M and M/L sizes; WR30 water resistance |
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| Tracking | — | 24/7 heart rate, activity, sleep and recovery tracking; Nightly Recharge, SleepWise, Sleep Plus Stages, Training Load Pro, automatic training detection |
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| Memory | — | 4 weeks of data on the band (16 MB storage) |
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| Connectivity | — | Bluetooth Low Energy (one connection, reserved for Polar Flow); no built-in GPS (uses phone GPS in Polar Flow) |
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| Software | — | Polar Flow app (free, no subscription); one-time purchase |
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