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Watch comparison

Apple Series 8 vs Apple Ultra 4 49mm

Compare battery life, health tracking, display and fit.

Compared products
01Selected
Apple Watch Series 8

Apple Watch Series 8

  • Screen: 41mm: 352 × 430 pixels; 45mm: 396 × 484 pixels.
  • Apple S8 SiP processor.
  • 1 GB RAM in this version.
  • 32 GB storage in this version.
  • Runs watchOS 9.0, upgradable to watchOS 26.6.
KSh 50,000In Stock
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02
Apple Watch Ultra 4 49mm

Apple Watch Ultra 4 49mm

  • 1.98 inch screen.
  • Apple S11 processor.
  • 64 GB storage in this version.
  • Runs watchOS 27.
  • Wi-Fi 4 support.
KSh 118,000In Stock
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Apple Watch Series 11KSh 51,000
WHOOP Life MGKSh 50,000
Apple Watch Series 12 42mmKSh 64,000
WHOOP LifeKSh 55,500
Amazfit Balance 3KSh 48,000
Apple Watch UltraKSh 90,000
Apple Watch Series 9KSh 45,000
2 of 4 products

Our quick verdict

The Apple Watch Ultra 4 49mm lasts longer between charges (50 hours vs 18 hours), gives daily readiness scores and has a brighter, sharper screen, while the Apple Watch Series 8 is lighter to wear all day.

Display

Apple Watch Series 8
41mm: 352 × 430 pixels; 45mm: 396 × 484 pixels
Apple Watch Ultra 4 49mm
422 × 514 pixels; 326 ppi; 1,245 mm² display area

Performance

Apple Watch Series 8
Apple S8 SiP processor
Apple Watch Ultra 4 49mm
Apple S11 processor

Storage

Apple Watch Series 8
32 GB storage in this version
Apple Watch Ultra 4 49mm
64 GB storage in this version

Software

Apple Watch Series 8
Runs watchOS 9.0, upgradable to watchOS 26.6
Apple Watch Ultra 4 49mm
Runs watchOS 27

Battery life

Apple Watch Series 8
Up to 18 hours per charge
Apple Watch Ultra 4 49mm
Up to 50 hours per charge

Key differences

The main differences to help you choose.

Apple Watch Series 8

  • Lighter: 31.9 g (vs 63 g).
  • Slimmer: 10.7 mm thick (vs 12 mm).

Apple Watch Ultra 4 49mm

  • Longer battery life: up to 50 hours (vs 18 hours).
  • Rated for up to 50 hours per charge (vs 18).
  • Brighter display: up to 3,000 nits (vs 1,000).
  • Daily readiness scores.
  • More storage: 64 GB (vs 32 GB).
  • Rated for free diving to 40 m.

What matters most to you?

Choose any priorities

How each product answers the questions buyers ask most. Tick a topic to add it, untick one to hide it.

6 priorities selected.
How each product answers the selected priorities
PriorityApple Watch Series 8Apple Watch Ultra 4 49mm
Battery lifeUp to 18 hours per chargeUp to 50 hours per charge
Storage32 GB storage64 GB storage
DisplayOLED display1.98-inch OLED display, 326 ppi
PerformanceApple S8 SiP processorApple S11 processor
SoftwarewatchOS 9.0watchOS 27
Water resistance50 m100 m under ISO 22810:2010

Detailed comparison

Explore the full specifications, section by section.

Display

Display specifications comparison
SpecificationApple Watch Series 8Apple Watch Ultra 4 49mm
DisplayAlways-On Retina LTPO OLEDRetina LTPO3 OLED, 3000 nits (peak); 1.98 inches
Screen resolution41mm: 352 × 430 pixels; 45mm: 396 × 484 pixels422 × 514 pixels; 326 ppi; 1,245 mm² display area
Display protectionIon-X glass (aluminum); sapphire crystal (stainless steel)Sapphire crystal
Display features1000 nits (peak)3000 nits (peak); Wide-angle OLED

Connectivity

Connectivity specifications comparison
SpecificationApple Watch Series 8Apple Watch Ultra 4 49mm
Network / cellularGSM / HSPA / LTEGSM / HSPA / LTE / 5G
SIM / eSIMeSIMeSIM
Wi-FiWi-Fi 802.11 b/g/n, dual-bandWi-Fi 802.11 b/g/n, dual-band
Bluetooth5.3, A2DP, LE5.3, A2DP, LE
NFCSupported; Apple PayYes
Positioning / GNSSGPS, GLONASS, GALILEO, QZSS, BDSGPS (L1+L5), GLONASS, GALILEO, BDS, QZSS
Ultra Wideband (UWB)Ultra Wideband (UWB) supportUltra Wideband (UWB) support (gen2 chip)
Satellite features—Emergency SOS via satellite

Identity & design

Identity & design specifications comparison
SpecificationApple Watch Series 8Apple Watch Ultra 4 49mm
BrandAppleApple
ModelApple Watch Series 8Apple Watch Ultra 4 49mm
Announced2022, September 072026, September 09
Dimensions41mm: 41 × 35 × 10.7 mm; 45mm: 45 × 38 × 10.7 mm49 x 44 x 12 mm (1.93 x 1.73 x 0.47 in)
Weight41mm: aluminum GPS 31.9 g, GPS + Cellular 32.2 g, stainless steel 42.3 g; 45mm: aluminum GPS 38.8 g, GPS + Cellular 39.1 g, stainless steel 51.5 gNatural titanium: 63.0 g; black titanium: 63.1 g
Build materialsAluminum or stainless-steel case; ceramic and sapphire crystal backGrade 5 titanium case; sapphire crystal front; ceramic and sapphire crystal back
Wrist size41mm: 130–200 mm; 45mm: 140–245 mm130–210 mm
Controls / buttonsDigital Crown with haptic feedback; side buttonCustomizable Action button; Digital Crown with haptic feedback; side button; single tap, double tap and wrist flick gestures
Strap / band—Included band; style depends on the selected configuration

Performance & software

Performance & software specifications comparison
SpecificationApple Watch Series 8Apple Watch Ultra 4 49mm
ProcessorApple S8 SiPApple S11
CPU64-bit dual-coreDual-core
GPUPowerVRPowerVR
RAM1GB—
Storage32 GB64GB
Operating systemwatchOS 9.0, upgradable to watchOS 26.6watchOS 27

Audio & communication

Audio & communication specifications comparison
SpecificationApple Watch Series 8Apple Watch Ultra 4 49mm
SpeakerSupportedDual speakers; media playback; siren
MicrophoneSupportedThree-microphone array with beamforming and wind-noise mitigation
CallingBluetooth calling; cellular calling on GPS + Cellular modelsCellular and Bluetooth calling; international emergency calling

Sensors, health & fitness

Sensors, health & fitness specifications comparison
SpecificationApple Watch Series 8Apple Watch Ultra 4 49mm
SensorsBlood oxygen sensor; electrical heart sensor; third-generation optical heart sensor; temperature sensor; compass; always-on altimeter; high-g accelerometer; high-dynamic-range gyroscope; ambient light sensorElectrical heart sensor; always-on optical heart sensor; blood oxygen sensor; temperature sensor; depth gauge; water-temperature sensor; compass; always-on altimeter; high-g accelerometer; high dynamic-range gyroscope; ambient-light sensor
Health & wellness featuresECG app; Blood Oxygen app where available; high and low heart-rate notifications; irregular rhythm notifications; temperature sensing; cycle trackingHeart rate; HRV; blood oxygen; ECG; wrist temperature; respiratory rate; Readiness; Vitals; cycle tracking; high/low heart-rate, irregular rhythm and hypertension notifications (regional availability)
Sleep trackingSleep duration and sleep stagesSleep duration; sleep stages; sleep score; sleep-apnea notifications (regional availability)
Sports / workout modesWorkout app with multiple workout types and automatic workout detectionRunning; hiking; cycling; pool and open-water swimming; skiing; snowboarding; rowing; paddling; golf; walking; HIIT; yoga; strength; dance; Pilates; Tai Chi; kickboxing; multisport and more
Training & outdoor featuresPace and heart-rate zones; compass waypoints and backtrackCustom workouts and views; Training Load and Workout Effort; heart-rate zones; VO₂ max; Race Route; Pacer; running dynamics; automatic track detection; offline maps, routes, waypoints, Backtrack and elevation alerts
Safety & emergency featuresEmergency SOS; international emergency calling; Fall Detection; Crash DetectionEmergency SOS; satellite SOS and messaging; international emergency calling; siren; flashlight; Fall Detection; Crash Detection; Check In; noise monitoring; emergency waypoints
Diving / depth features—Recreational scuba diving to 40 m; automatic dive launch at 1 m; current/maximum depth and duration; GPS entry/exit points; depth gauge and water temperature

Battery & durability

Battery & durability specifications comparison
SpecificationApple Watch Series 8Apple Watch Ultra 4 49mm
Battery lifeUp to 18 hours normal useUp to 50 hours normal use; 84 hours Low Power Mode; 18 hours workout tracking; 25 hours Extended Workout; 45 hours Max Extended Workout
ChargingMagnetic fast charging to USB-C cableMagnetic fast charging; up to 80% in about 45 minutes
Water resistance50 m; swimproof100 m under ISO 22810:2010; suitable for swimming, snorkeling, scuba and high-speed water sports
Durability / certificationsIP6X dust resistanceIP6X dust resistance under IEC 60529; EN 13319 recreational diving to 40 m; tested to MIL‑STD‑810H
Battery capacity—Li-Ion 631 mAh

Compatibility

Compatibility specifications comparison
SpecificationApple Watch Series 8Apple Watch Ultra 4 49mm
Phone compatibilityiPhone 8 or later; iOS 16 or lateriPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 27 or later
Companion appApple Watch app on iPhoneApple Watch app on iPhone
ColorsGraphite, Silver, GoldNatural, Black

Additional specifications

Additional specifications specifications comparison
SpecificationApple Watch Series 8Apple Watch Ultra 4 49mm
Pixels per inch326 ppi326 ppi
Peak brightnessUp to 1,000 nitsUp to 3,000 nits peak; 1 nit minimum
Cover / touchscreenSupportedSupported
Release statusAvailable. Released 2022, September 16Available. Released 2026, September 18
Model numbersA2773, A2775, A2772, A2774, A2857, A2858, watch6,16, watch6,17A3579
Card slotNoNo
CameraNoNo
3.5 mm headphone jackNoNo
USBNoNo
RadioNoNo
2G bandsGSM 850 / 900 / 1800 / 1900GSM 850 / 900 / 1800 / 1900
3G bandsHSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 - International, China, HK; HSDPA 850 / 1700(AWS) / 1900 / 2100 - USA, LATAM, CanadaHSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands1, 2, 3, 4, 5, 6, 7, 8, 18, 19, 20, 25, 26, 28, 39, 40, 41, 66 - International, China, HK; 1, 2, 3, 4, 5, 6, 7, 12, 13, 14, 17, 18, 19, 25, 26, 39, 40, 41, 66 - USA, LATAM, Canada1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 38, 39, 40, 41, 53, 66, 71
Network speedHSPA, LTEHSPA, LTE, 5G
SAR (US)0.31 W/kg (head) 0.55 W/kg (body)—
SAR (EU)0.31 W/kg (head) 0.55 W/kg (body)—
Additional hardware featuresTemperature sensing (0.01˚ accuracy)Health Sensing System: third‑generation electrical heart sensor, always‑on optical heart sensor, blood oxygen sensor, temperature sensor; Temperature sensing (0.01˚ accuracy); Depth gauge (±1m accuracy)
Battery typeRechargeable lithium-ion—
Case material—Grade 5 titanium
Military-grade resistance—MIL-STD-810H
Flashlight—Supported
Display material—LTPO3 wide-angle OLED
Charging time—About 45 minutes to 80%; 15 minutes for up to 18 hours normal use; 5 minutes for up to 10 hours sleep tracking
Packing list—Apple Watch Ultra 4; band; 1 m magnetic fast-charger to USB-C cable
5G bands—1, 2, 3, 5, 7, 8, 12, 14, 20, 25, 26, 28, 38, 40, 41, 53, 66, 71 SA/NSA

Similarities

  • Both belong to the Apple Watch platform.
  • Both support Wi-Fi 4.
  • Both use Bluetooth 5.3.
  • Both work with a companion app.
  • Both have NFC.
  • Both take ECG readings.

In summary

For most buyers the Apple Watch Ultra 4 49mm is the better buy; the Apple Watch Series 8 makes sense if you want a lighter watch for all-day wear.

Back to compared products ↑

In-stock alternatives

WHOOP Life MGFor Apple Watch Series 8WHOOP Life MGView product ↗Apple Watch Series 11For Apple Watch Series 8Apple Watch Series 11View product ↗Apple Watch Ultra 2For Apple Watch Ultra 4 49mmApple Watch Ultra 2View product ↗Apple Watch Series 12 42mmFor Apple Watch Ultra 4 49mmApple Watch Series 12 42mmView product ↗

Related comparisons

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