| Physical features | Apple Watch 3 Aluminum (38mm) | Samsung Galaxy Watch (42mm SM-R815F) |
| Model | Watch 3 Aluminum (38mm) | Galaxy Watch (42mm SM-R815F) |
| Other model names | Apple Watch Series 3 A1858 GPS 8GB, Apple Watch S3, iWatch | Galaxy Watch 42mm (4G LTE) SM-R815FZDAAMO, Samsung Galileo |
| Country or region available | 
(Global, International) |       
(Europe), South Africa, Saudi Arabia, Australia, Israel, Singapore, Taiwan |
| Brand | Apple | Samsung |
| Release date | September, 2017 | August, 2018 |
| Depth | 11.4 millimeters (0.45 inches) | 12.7 millimeters (0.5 inches) |
| Size (width x height) | 33.3 x 38.6 millimeters (1.31 x 1.52 in) | 41.9 x 45.7 millimeters (1.65 x 1.8 in) |
| Weight | 27 grams (.95 ounces) | 49 grams (1.72 ounces) |
| Qwerty physical keyboard | Not supported | Not supported |
| Antenna | Not supported | Internal antenna |
| Build, materials | Aluminum body, glass front, plastic composite back | Stainless steel body, glass front |
| Protection against water and others | 50 meters waterproof | 50 meters waterproof.
MIL-STD-810G military certified: salt, dust, humidity, rain, vibration, solar radiation, transport and thermal shock resistant. |
| System (OS) | Apple Watch 3 Aluminum (38mm) | Samsung Galaxy Watch (42mm SM-R815F) |
| Operating system | WatchOS 4.0 | Tizen 4.0 |
| Firmware update | WatchOS 5.0 | feature not registered |
| Hardware | Apple Watch 3 Aluminum (38mm) | Samsung Galaxy Watch (42mm SM-R815F) |
| Chipset | 32bit - Apple S3 (28nm) | 64bit - Samsung Exynos 9 Dual 9110 (10nm) |
| CPU processor | 1Ghz Dual-Core ARM Cortex-A7 | 1.15Ghz Dual-Core ARM Cortex-A53 |
| GPU graphical controller | PowerVR G6200 | ARM Mali-T720 MP1 |
| RAM memory | 768MB LPDDR4 | 1.5GB LPDDR3 |
| Internal storage | 8GB (5GB available) | 4GB (1.5GB available)
eMMC |
| External storage | Not supported | Not supported |
| Display | Apple Watch 3 Aluminum (38mm) | Samsung Galaxy Watch (42mm SM-R815F) |
| Display type | AMOLED | Super AMOLED |
| Screen size | 1.5" inches | 1.2" inches |
| Screen-to-body ratio | ~55.1% (screen-to-body ratio) | ~24.3% (screen-to-body ratio) |
| Display resolution | 340x272 pixels | 360x360 pixels (1:1) |
| Touchscreen | Capacitive Multitouch | Capacitive Multitouch |
| Pixel density (dot pitch) | 290 PPI | 424 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Scratch-resistant glass | Gorilla Glass DX+ |
| Display features | feature not registered | Not supported |
| Mobile networks | Apple Watch 3 Aluminum (38mm) | Samsung Galaxy Watch (42mm SM-R815F) |
| Dual-SIM | Not supported | Not supported |
| SIM card | Not supported | 1 slot (Single-SIM)
e-SIM (Eletronic) |
| Maximum download/upload | feature not registered | 10 Mbps |
| Network technology | feature not registered | 3G, 4G |
| Frequency, bands | Expand band detailsCollapse details |
| GSM Mhz band | Not supported | Not supported |
| Primary 2G network | Not supported | Not supported |
| Primary 3G network | Not supported | UMTS 900/1900 |
| Primary 4G network | Not supported | LTE (Bands 1,3,7,8,20) |
| Primary 5G network | Not supported | Not supported |
| Primary data network | Not supported | UMTS, HSDPA, HSUPA, HSPA+, LTE |
| Secondary 2G network | Not supported | Not supported |
| Secondary 3G network | Not supported | Not supported |
| Secondary 4G network | Not supported | Not supported |
| Secondary data network | Not supported | Not supported |
| Calling | Apple Watch 3 Aluminum (38mm) | Samsung Galaxy Watch (42mm SM-R815F) |
| Messaging | SMS, E-mail | SMS (T9), MMS, E-mail, Push mail |
| Speakerphone | Supported | Supported |
| Video calling | Not supported | Not supported |
| Call control | Not supported | Voice dialing, Voice recorder, Voice commands |
| Camera | Apple Watch 3 Aluminum (38mm) | Samsung Galaxy Watch (42mm SM-R815F) |
| Back camera (main camera) | Not supported | Not supported |
| Main camera resolution | Not supported | Not supported |
| Video recording (primary) | Not supported | Not supported |
| Flash | Not supported | Not supported |
| Focal aperture | feature not registered | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | feature not registered |
| Autofocus | Not supported | Not supported |
| Touch focus | Not supported | Not supported |
| Image stabilization | Not supported | Not supported |
| Zoom | Not supported | Not supported |
| Face/smile detection | Not supported | Not supported |
| BSI sensor | Not supported | Not supported |
| HDR | Not supported | Not supported |
| 2ª camera | Apple Watch 3 Aluminum (38mm) | Samsung Galaxy Watch (42mm SM-R815F) |
| Front camera (secondary) | Not supported | Not supported |
| Front camera resolution | Not supported | Not supported |
| Video recording (secondary) | Not supported | Not supported |
| Front flash | Not supported | Not supported |
| Focal aperture | feature not registered | feature not registered |
| Focal length | feature not registered | feature not registered |
| Sensor size | feature not registered | feature not registered |
| Pixel size | feature not registered | feature not registered |
| Multimedia | Apple Watch 3 Aluminum (38mm) | Samsung Galaxy Watch (42mm SM-R815F) |
| Radio | Not supported | Not supported |
| TV | Not supported | Not supported |
| Video formats | MP4, H.264, H.263 | MP4 |
| Audio formats | MP3, WAV, eAAC+, FLAC | MP3, WAV, WMA, OGG, eAAC+ |
| Connectivity | Apple Watch 3 Aluminum (38mm) | Samsung Galaxy Watch (42mm SM-R815F) |
| USB | Not supported | Not supported |
| TV output | Not supported | Not supported |
| Audio output | Not supported | Not supported |
| Bluetooth | 4.2 + A2DP | 4.2 + A2DP |
| WiFi | 802.11 b/g/n (2.4Ghz) | 802.11 b/g/n (2.4Ghz) |
| DLNA | Not supported | Not supported |
| NFC | Supported | Supported |
| GPS | A-GPS, GeoTagging, GLONASS | A-GPS, GeoTagging, GLONASS |
| Infrared port | Not supported | Not supported |
| Other functions | Apple Watch 3 Aluminum (38mm) | Samsung Galaxy Watch (42mm SM-R815F) |
| Active noise cancellation | Not supported | Not supported |
| Vibrating alert | Supported | Supported |
| Ringtones | feature not registered | Polyphonic and customized |
| Web browser | Not supported | Not supported |
| Sensors | Accelerometer
Ambient Light sensor
Gyroscope
Barometer
Heart rate
Pedometer
| Accelerometer
Ambient Light sensor
Gyroscope
Barometer
Heart rate
Pedometer
|
| Other features | - Colors: Silver, Gold, Space Gray
- Sport Band or Nike Sport Band
- 1000 nits screen
- 3D Touch display
- Siri | - Colors: Midnight Black, Rose Gold
- Straps: Black, Grey, Red, Yellow, Purple, Pink, Brown
- Compatible with standard 20mm straps
- Always-on display
- Rotating bezel
- Samsung Pay |
| Power supply | Apple Watch 3 Aluminum (38mm) | Samsung Galaxy Watch (42mm SM-R815F) |
| Battery | Li-Ion: Lithium-Ion (Non removable) | Li-Ion: Lithium-Ion (Non removable) |
| Battery capacity | 279 mAh | 270 mAh |
| Charger, watts | Standard charging
Magnetic charging (dock) | 3.5W (5V/0.7A) Standard charging
Qi wireless charging |
| Talk time autonomy | 1080 minutes | 18 hours | 0.8 day | feature not registered |
| Standby | feature not registered | 4320 minutes | 72 hours | 3 days |
| Radiation rate | Apple Watch 3 Aluminum (38mm) | Samsung Galaxy Watch (42mm SM-R815F) |
| SAR 1.6W/kg (USA, Mexico, etc.) | 0.17W/kg (head) | 0.03W/kg (body) | feature not registered |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | 0.383W/kg (head) | 0.383W/kg (body) |