Fitbit Inspire 3 Health & Fitness Tracker
Specifications
- Display: 0.81″ color AMOLED touchscreen
- Always-on display: Yes (reduces battery to ~3+ days)
- Heart rate sensor: Optical (24/7 continuous)
- ECG: No
- EDA / Stress sensor: No (Stress Management Score uses pulse + respiration)
- SpO2: Yes (overnight blood oxygen monitoring)
- Skin temperature: Yes (overnight variation tracking)
- GPS: Connected GPS only (phone GPS via Bluetooth — no built-in GPS)
- NFC: No
- Exercise modes: 40+ (expanded via July 2024 firmware update)
- Battery life: Up to 10 days (varies with use and AOD setting)
- Water resistance: 5 ATM (50 m) — pool, shower, rain safe
- Connectivity: Bluetooth 5.0
- Sensors: 3-axis accelerometer, ambient light, vibration motor, SpO2, skin temp
- Weight (with band): ~0.7 oz (20 g)
- Dimensions: 39.32 × 18.6 × 11.75 mm
- Band sizes: S: 5.4″–7.6″ / L: 7.6″–8.7″ (both included)
- Compatibility: iOS 16.4+ / Android 9+
- Colors: Midnight Zen/Black · Lilac Bliss/Black · Morning Glow/Black
- MPN — Midnight Zen/Black: FB424BKBK-US
- MPN — Lilac Bliss/Black: FB424BKLV-US
- MPN — Morning Glow/Black: FB424BKYW-US
- UPC — Midnight Zen/Black: 810073611573
Health & Heart Rate Sensors
- Optical heart rate sensor (24/7 continuous monitoring)
- SpO2 blood oxygen monitoring (overnight)
- Skin temperature variation tracking
- Stress Management Score (pulse + respiration based)
- Irregular heart rhythm notifications
- High/low heart rate alerts
- Resting heart rate tracking
- No ECG sensor
- No EDA stress sensor
Fitness & Activity Tracking
- Connected GPS (phone GPS via Bluetooth — no built-in GPS)
- 40+ exercise modes (expanded via July 2024 firmware update)
- SmartTrack auto-detection (walks, runs, cycling, rowing, elliptical, spinning)
- Active Zone Minutes (double credit for cardio and peak zones)
- Daily Readiness Score (Fitbit Premium required)
- Cardio Fitness Score (VO2 Max estimate)
- Steps, distance, and calories burned (24/7)
- Move reminders
Sleep & Wellness
- Automatic sleep stage tracking (light, deep, REM)
- Daily Sleep Score
- Sleep Profile with monthly sleep animal (Premium)
- Smart Wake vibrating alarm
- Sleep mode / Do Not Disturb
- Guided breathing and Relax sessions
- Menstrual health tracking
Hardware & Battery
- 0.81″ color AMOLED touchscreen with always-on display option
- Plastic case with silicone band
- Up to 10-day battery life
- Proprietary magnetic USB charging cradle
- 5 ATM water resistance (50 m)
- Bluetooth 5.0 (no NFC, no Wi-Fi)
- Weight: ~0.7 oz (20 g) with band
- Dimensions: 39.32 × 18.6 × 11.75 mm
- S band (5.4″–7.6″) and L band (7.6″–8.7″) both included
What's in the Box
- Fitbit Inspire 3 tracker
- Small band (S) and large band (L)
- Charging cable
- Exercise clip (for clipping to clothing)
- 6-month Fitbit Premium trial (new and returning users)
About This Tracker
Fitbit's entry-level tracker built around the health data that matters most: 24/7 heart rate, overnight SpO2, skin temperature variation, a Stress Management Score, and automatic sleep stage tracking — all from a band that weighs just 0.7 oz and runs for up to 10 days on a charge. Color AMOLED screen with always-on option. Connected GPS for outdoor workouts. 5 ATM water resistance. Available in three colors: Midnight Zen/Black, Lilac Bliss/Black, and Morning Glow/Black.