Design | Device Type | Watch | Watch | |
| OS | watchOS 4.0 | Tizen-based wearable platform 3.0 | |
| Dimension | 42.5 x 36.4 x 11.4 mm (1.67 x 1.43 x 0.45 in) | 44.6 x 42.9 x 11.6 mm (1.76 x 1.69 x 0.46 in) | |
| Weight | 52.8 g (1.87 oz) | 67g (w/ strap); 50g (w/о strap) (1.76 oz) | |
Technology | 2G Network | GSM 850 / 900 / 1800 / 1900 | | |
| 3G Network | HSDPA 2100 | | |
| 4G Network | LTE | | |
| SIM | Electronic SIM card (e-SIM) - 50m waterproof | No - Samsung Pay - MIL-STD-810G compliant - 50m waterproof - Compatible with standard 20mm straps | |
| Announced | September, 2017 | August, 2017 | |
| Status | September, 2017 | October 26, 2017 | |
Display | Type | AMOLED capacitive touchscreen, 16M colors | Super AMOLED capacitive touchscreen, 16M colors | |
| Size | 1.65 inches (~55.4% screen-to-body ratio) | 1.2 inches, 4.6 cm2 (~24.3% screen-to-body ratio) | |
| Multi-touch | Yes | Yes | |
| Protection | Sapphire crystal glass - 3D Touch display - 1000 nits | Corning Gorilla Glass 3 - Always-on display - Rotating bezel | |
Photography | Rear Camera | No | No | |
| Features | No | | |
| Video | No | | |
Memory | Card slot | No | No | |
| Internal | 16 GB, 768 MB RAM (To Be Confirmed) | 4 GB, 768 MB RAM | |
Sound | Alert types | Vibration; Ringtones | Vibration; MP3, WAV ringtones | |
| Loudspeaker | Yes | Yes | |
| 3.5mm jack | No | No | |
Connectivity | GPRS | Yes | No | |
| EDGE | Yes | No | |
| Speed | HSPA, LTE | N/A | |
| WLAN | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n | |
| Bluetooth | 4.2, A2DP, LE | 4.2, A2DP, LE | |
| NFC | Yes | Yes | |
| USB | No | No | |
Battery | Capacity | Non-removable Li-Ion battery | Non-removable Li-Ion 300 mAh battery | |
Features | Chipset | Apple S3 | Exynos 3250 Dual | |
| CPU | Dual-core | Dual-core 1.0 GHz Cortex-A7 | |
| GPU | PowerVR | Mali-400MP2 | |
| Sensors | Accelerometer, gyro, heart rate | Accelerometer, gyro, heart rate, barometer | |
| Messaging | SMS(threaded view), Email, Push Mail, IM | SMS(threaded view), MMS, Email, IM | |
| Browser | No | No | |
| Radio | No | No | |
| GPS | Yes, with A-GPS, GLONASS | Yes, GLONASS | |
| Java | No | No | |
| Colors | Various | Black, Blue | |
| Others | - MP3 player - Photo viewer - Siri natural language commands and dictation | - Qi wireless charging - Bixby natural language commands and dictation - MP3/M4A/AAC/WAV player - Photo viewer - Voice memo/dial/commands | |