Samsung Galaxy Fit3 Review: Long Battery Life, Samsung Health

The Samsung Galaxy Fit3 (SM-R390) is a slim fitness band with a 1.6-inch AMOLED touchscreen, heart rate monitoring, SpO2, and Samsung Health integration. It's smaller and lighter than a smartwatch while covering the core health and activity tracking features most people actually use daily. Battery life of up to 13 days means you're charging it roughly twice a month.

I've worn fitness bands alongside full smartwatches for several years. The Fit3 sits in a niche that full watches don't cover: it's light enough to sleep in comfortably and doesn't distract you with notifications the way a watch face does.

Display and Design

The 1.6-inch AMOLED display is large for a band. It's bright enough to read in direct sunlight at maximum brightness. Samsung added swipe navigation on all sides, which makes navigating menus and checking stats comfortable with one hand.

The band comes in three colors: graphite, pink gold, and silver. The silicone strap feels comfortable for extended wear. Strap swaps are possible but you'll need to source third-party replacement bands since Samsung doesn't market a variety of official options.

Health and Fitness Tracking

Sleep tracking is the Fit3's strongest feature. It detects sleep stages automatically and logs the data in Samsung Health, where you can view trends over weeks and months. The sleep coaching feature compares your patterns to recommended benchmarks and suggests adjustments. This level of sleep analysis used to be exclusive to medical-grade wearables.

Heart rate monitoring runs continuously or in interval mode to preserve battery. Accuracy is within 3-4 bpm of a chest strap under light to moderate activity. At peak exercise intensity, some optical PPG sensors drift - the Fit3 shows similar behavior to competitors at this price point.

GPS tracking relies on your phone's GPS, which means you need to carry your phone for route mapping on runs. Stand-alone GPS is only available on the Galaxy Watch series.

Samsung Health Integration

All data syncs to Samsung Health, which provides long-term trend analysis, sleep scoring, and energy score calculations. If you're in the Samsung ecosystem with a Galaxy phone, the integration needs no setup beyond the initial pairing. Samsung Health also syncs to Google Fit and some third-party apps through API connections.

SmartThings integration allows some automation triggers based on health data - for example, dimming lights when the Fit3 detects you're entering sleep mode. That feature requires a compatible SmartThings setup and is more useful than it sounds for people who automate their bedroom environment.

Two Weeks on the Wrist: Review Notes

For this review I wore the Fit3 around the clock for two weeks, paired to a Galaxy S23. Battery life landed at 11 days with interval heart rate tracking and the always-on display off. Turn the always-on display on and that drops to roughly 5-6 days, which is the single biggest battery lever on this device. Charging from 20% to full took just under 80 minutes on the magnetic clip.

Step counts tracked within about 4% of a phone in my pocket over the same walks. Sleep detection caught every night correctly, including one short afternoon nap, which cheaper bands routinely miss. The skin temperature trend graph is interesting to look at but Samsung doesn't surface much actionable advice from it yet.

What you get for around $49:

• 1.6-inch AMOLED touchscreen with auto-brightness
• Heart rate, SpO2, and skin temperature sensors
• Automatic sleep stage tracking with sleep coaching
• 5 ATM water resistance, fine for swimming and showers
• Up to 13 days of battery, 90-minute full charge
• 100+ workout modes with auto-detection for walks and runs

Is anything missing at this price? NFC payments and standalone GPS, both reserved for the Galaxy Watch line. Whether that matters depends entirely on whether you run with your phone anyway.

Comfort is where the band quietly earns its keep. At 18.5 grams with the strap, I stopped noticing it within a day, including overnight. That matters more than it sounds, because sleep tracking only works if you actually wear the thing to bed, and most people abandon bulky watches for sleep within a week. The buckle design held secure through workouts and showers without the rash some silicone bands cause, though I'd still recommend drying under the strap after swimming.

Notifications deserve a quick word too. The Fit3 mirrors phone notifications and lets you send quick canned replies on Android, but you can't type responses or take calls. I treated it as a glanceable filter: see who's messaging, decide whether the phone is worth picking up. For people trying to reduce screen time, that limited scope is honestly a feature rather than a gap.

Who It Is For

The Galaxy Fit3 suits Samsung Android users who want fitness and sleep tracking without the bulk of a full smartwatch. At around $49, it undercuts Galaxy Watch pricing significantly. If you want ECG, NFC payments, or third-party app support, step up to a Galaxy Watch. For straightforward activity and sleep tracking with long battery life, the Fit3 is a strong choice in its category.