WHOOP 4.0 Sensor vs Samsung Galaxy Watch 9 40mm
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At a glance
Key specifications and important differences. Full details follow below.
| Feature |  WHOOP 4.0 Sensor |  Samsung Galaxy Watch 9 40mm |
|---|---|---|
| Price | KSh 36,000.00 | KSh 39,500.00 |
| Display | — | 1.34-inch Super AMOLED Always On Display |
| Battery capacity | Internal rechargeable battery; capacity not published | 390 mAh lithium-ion |
| Water resistance | IP68; water-resistant up to 10 m for 2 hours; swimming and showering supported, not diving | 5 ATM / 50 m under ISO 22810; IPX8 tested to 1.5 m fresh water for up to 30 minutes |
| Processor | — | Snapdragon SW6100 Wear Elite (3 nm) |
| RAM | — | 2 GB |
| Storage | — | 32 GB |
| Operating system | — | Wear OS 7 with One UI Watch 9 |
| Network / cellular | — | GSM, HSPA and LTE on LTE models |
| Positioning / GNSS | — | Dual-band GPS (L1+L5); GLONASS; Galileo; BeiDou; QZSS |
| Health & wellness features | Continuous heart rate, HRV, respiratory rate, skin-temperature variation, strain and recovery tracking; not a medical device | Heart rate; ECG; blood pressure; blood oxygen; body composition; skin temperature; antioxidant index; Energy Score |
Full specifications
2 of 4 products
| Specification | WHOOP 4.0 Sensor | Samsung Galaxy Watch 9 40mm |
|---|---|---|
| Identity & design | ||
| Brand | WHOOP | Samsung |
| Model | WHOOP 4.0 sensor | Samsung Galaxy Watch9 40mm |
| Announced | — | 22 July 2026 |
| Dimensions | Exact dimensions not published in current WHOOP support documentation | 42.7 × 40.4 × 8.6 mm |
| Weight | Exact weight not published in current WHOOP support documentation | 31.5 g |
| Build materials | Screen-free continuous-wear sensor housing | Sapphire crystal front; Armor Aluminum 2 frame |
| Strap / band | — | Lightweight breathable Sport Band with Dynamic Lug System |
| Controls / buttons | — | Touchscreen and two side buttons |
| Display | ||
| Display | — | 1.34-inch Super AMOLED Always On Display |
| Screen resolution | — | 438 × 438 pixels |
| Display protection | — | Sapphire crystal |
| Display features | — | Full-color Always On Display; up to 3,000 nits peak brightness |
| Performance & software | ||
| Processor | — | Snapdragon SW6100 Wear Elite (3 nm) |
| CPU | — | Penta-core, 1 × 2.1 GHz + 4 × 1.95 GHz |
| RAM | — | 2 GB |
| Storage | — | 32 GB |
| Operating system | — | Wear OS 7 with One UI Watch 9 |
| Connectivity | ||
| Network / cellular | — | GSM, HSPA and LTE on LTE models |
| SIM / eSIM | — | eSIM on LTE models |
| Wi-Fi | — | Wi‑Fi 802.11 a/b/g/n/ac, dual-band |
| Bluetooth | — | Bluetooth 6.0 |
| NFC | — | Supported |
| Positioning / GNSS | — | Dual-band GPS (L1+L5); GLONASS; Galileo; BeiDou; QZSS |
| Audio & communication | ||
| Speaker | — | Supported |
| Microphone | — | Supported |
| Calling | — | Bluetooth calling; standalone cellular calling on LTE models |
| Sensors, health & fitness | ||
| Sensors | Photoplethysmography sensors and skin-temperature sensing | Accelerometer; barometer; bioelectrical impedance analysis sensor; electrical heart sensor; gyroscope; geomagnetic sensor; ambient-light sensor; optical heart-rate sensor; skin-temperature sensor |
| Health & wellness features | Continuous heart rate, HRV, respiratory rate, skin-temperature variation, strain and recovery tracking; not a medical device | Heart rate; ECG; blood pressure; blood oxygen; body composition; skin temperature; antioxidant index; Energy Score |
| Sleep tracking | Automatic sleep detection, sleep duration, stages, sleep need and sleep performance | Sleep duration, patterns and quality; sleep coaching; sleep-apnea risk detection |
| Sports / workout modes | Automatic and manual activity tracking | Automatic and manual workout tracking across running, walking, cycling, swimming and other activities |
| Training & outdoor features | — | Personalized exercise guidance; running coaching; dual-band GNSS route tracking |
| Safety & emergency features | — | Fall detection and Emergency SOS |
| Battery & durability | ||
| Battery capacity | Internal rechargeable battery; capacity not published | 390 mAh lithium-ion |
| Battery life | Approximately 5 days | Up to 40 hours with Always On Display off; up to 30 hours with Always On Display on |
| Charging | WHOOP 4.0 slide-on wireless Battery Pack for on-wrist charging | Fast WPC-based wireless charging, 10 W |
| Water resistance | IP68; water-resistant up to 10 m for 2 hours; swimming and showering supported, not diving | 5 ATM / 50 m under ISO 22810; IPX8 tested to 1.5 m fresh water for up to 30 minutes |
| Durability / certifications | — | IP6X dust resistance; MIL‑STD‑810H certified; ECG certified |
| Compatibility | ||
| Phone compatibility | Compatible iPhone or Android phone; current support recommends iOS 18+ or Android 10+ | — |
| Companion app | WHOOP app | Samsung Health |
| Colors | — | Cream; Graphite |
| Additional specifications | ||
| Charging time | Approximately 150 minutes for the sensor; around 2 hours for the Battery Pack | — |
| Movement sensors | Accelerometer | — |
| Bluetooth and Wi-Fi | Bluetooth 4.2 or higher | — |
| Packing list | WHOOP 4.0 sensor, compatible band and WHOOP 4.0 Battery Pack | — |
| Smart recognition | Automatically recognizes 45 activity types | — |
| Energy, load and readiness features | Recovery, Strain and Sleep scores with personalized coaching | — |
| strap material | SuperKnit performance band | — |
| armband | WHOOP 4.0 band; not compatible with WHOOP 5.0 or MG | — |
| heart rate broadcast | Real-time heart-rate broadcast supported | — |
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