Samsung Galaxy Fit3

Samsung Galaxy Fit3

By Samsung · Fitness Trackers · Phones & Computers · More from Samsung

  • Display: 1.6 inch AMOLED
  • Battery life: up to 13 days
  • Battery capacity: 208 mAh
  • Water and dust rating: 5 ATM and IP68
  • Workout types: 100+

Lowest price seen
~$59.99 (approx.)
from $59.99 at Amazon

Prices are snapshots. Check the current price with the store.

Summary

A budget Android fitness tracker with a bright AMOLED screen, heart rate accuracy that holds up against smartwatches, and battery life measured at over a week per charge. Check your phone before you buy — it does not work with iPhones, and it has no built-in GPS, so it cannot track a run unless your phone comes along.

Strengths

  • Heart rate stays close to the reference: within 3–7 bpm of an Apple Watch Ultra 2 during steady cardio (PCMag).
  • PCMag measured 7.5 days of battery with always-on off; TechGearLab nearly matched the 13-day claim.
  • Light at 0.65 oz and comfortable enough for sleep tracking.
  • Bright AMOLED display with an always-on option.
  • Fall detection and an SOS emergency feature (press the side button 5 times).
  • PCMag gave it a Editors’ Choice award at a $69.99 MSRP, and it has often sold for less.

Weaknesses

  • No built-in GPS: CNET’s phone-free 5K came out about 0.5 km short.
  • iPhone owners cannot use the band at all.
  • PCMag logged recurring ~30-minute gaps in sleep stage data, underestimating sleep.
  • Owners report workouts and heart rate readings that never reach the Samsung Health app.
  • Pairing takes three separate apps, and updates can unpair the band.
  • Some owners report ~20% per hour battery drain even with features switched off.

Verified specifications

ModelSamsung Galaxy Fit3 (SM-R390), 40mm case.
Display1.6-inch (40.0mm) AMOLED touchscreen, 256 × 402 pixels.
Battery208 mAh; Samsung claims up to 13 days, or 3.5 days with always-on display.
Tested battery life7.5 days with always-on off, 4.5 days with it on (PCMag); a full charge took 71 minutes.
Water and dust5 ATM and IP68; Samsung rates the band for 50 meters.
Weight18.5 g without the band, 36.8 g with it.
Dimensions42.9 × 28.8 × 9.9 mm (H × W × D).
Case and bandaluminum case, polycarbonate back, silicone sport band with quick-release pins.
Chargingmagnetic cable in the box; no power adapter included.
Sensorsaccelerometer, barometer, optical heart rate sensor, light sensor, gyroscope.
ConnectivityBluetooth v5.3. No GPS, no NFC, no speaker, no microphone.
Phone compatibilityAndroid 10 or later with 1.5 GB RAM (PCMag); the manual states Android 11.0+. No iOS support.
Health trackingheart rate, SpO2, heart rate variability, sleep, stress, fall detection with emergency SOS.
Workouts100+ tracked types.
SoftwareFreeRTOS with a fixed app set; no third-party apps.
Full research notes and sources

Heart rate, steps and GPS

Heart rate is the Fit3’s strongest suit. PCMag tested it against an Apple Watch Ultra 2 during running and HIIT and saw it stay within 3–7 bpm in steady-state cardio and 5–10 bpm in intervals. CNET measured 2–5 bpm from a Polar chest strap at peak effort, with a few seconds of lag, and TechGearLab found it within a few bpm of a chest strap too. Step counting is weaker: owners on Reddit and in the Samsung Community report ghost steps, double counting and delayed registration, and TechGearLab found distance ran about 5% short with a fluctuating real-time pace. There is no GPS in the band — routes come from your phone, and CNET’s phone-free 5K was off by about 0.5 km. Sleep tracking has holes too: PCMag saw periodic ~30-minute gaps on multiple nights, and CNET’s “Excellent” 91 sleep score on a 6.5-hour night looked generous.

Battery life

Samsung claims up to 13 days. PCMag measured 7.5 days with always-on display off and 4.5 days with it on, with a full charge in 71 minutes. CNET got 3 days with always-on, full notifications, sleep tracking and daily workouts, while TechGearLab said the band nearly met the 13-day claim. Real-world battery depends heavily on notification volume and which features stay on. On the Samsung Community, some owners report severe drain — about 20% per hour — even with features switched off. Charging uses a magnetic cable, and the manual says to keep the contacts clean and use only Samsung-approved charging gear.

Sync, pairing and the Samsung phone requirement

The Fit3 runs FreeRTOS, not Wear OS, with a fixed app set and no third-party apps. Getting it paired takes three separate apps — Galaxy Wearable, Samsung Health and a Fit3 plugin — and owners report updates that unpair the band. A Samsung Community review documents workouts started on the band over phone GPS that never transfer to the Samsung Health app, and Reddit users report heart rate data that fails to sync until the app cache is cleared or the band is factory-reset. Snoring detection, camera control and alarm syncing require a Samsung Galaxy phone. Some workout sync failures appear tied to GPS plugin permissions. Nobody has published failure rates for any of this, so treat the sync problems as known annoyances rather than confirmed defects.

Is it worth it?

At its $69.99 MSRP the Fit3 covers the health basics well for Android users, and the street price has been lower: PCMag logged $55 in February 2025 and $47 later that year, CNET saw $36–$47 at points in 2025, and CNET and Tom’s Guide listed $59–$60 at launch. The value math is simple — strong at $40 or less, fair-to-good from $41 to $60, and weak above $70, where Wear OS watches with GPS and ECG become the alternatives. There are no mandatory subscriptions for the core fitness features; the only recurring cost is an optional replacement band. Value depends on your phone: without an Android handset the band does not work at all, and without a Samsung phone you lose snoring detection, camera control and alarm syncing.

Which model this is

This page covers the Samsung Galaxy Fit3, model SM-R390, in a 40mm case with Dark Grey, Silver and Pink Gold color options. The Amazon listing for this model is ASIN B0DPB9YBDR. Do not confuse it with the older Galaxy Fit2, which lacks the barometer, SpO2 and fall detection, or the Galaxy Watch line, which runs Wear OS with GPS and ECG at higher prices.

Sources

Manufacturer:

Independent reviews:

Owner reports:

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