Apple Watch Series 3 vs Series 5 – Which Should You Buy?

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By Maya Collins • April 27, 2026
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Apple Watch Series 5 & Series 3 have some important differences, both models are popular for their health tracking, smart features, and daily utility. The Apple Watch Series 5 is a more advanced model with newer sensors, more advanced display, additional health sensors, more internal storage and better connectivity. The Series 3 is more affordable and still provides core fitness tracking. Let’s explore their differences and similarities to find your perfect fit!

Feature-by-Feature Breakdown

Processor:

  • Apple Watch Series 5 features the S5 64-bit dual-core processor that improves app performance and system responsiveness.
  • Apple Watch Series 3 uses the older S3 dual-core processor, which is slower with modern apps.
Winner:

Apple Watch Series 5

Display:

  • Apple Watch Series 5 includes an Always-On Retina LTPO OLED 1.78 inch display that maintains high visibility in all lighting conditions.
  • Apple Watch Series 3 has a standard 1.6 inch Retina OLED display.
Winner:

Apple Watch Series 5

Brightness:

  • Apple Watch Series 5 supports up to 1000 nits of brightness that improves visibility in direct sunlight.
  • Apple Watch Series 3 reaches up to 1000 nits, which is still usable outdoors but less vibrant.
Winner:

Tie

Operating System:

  • Apple Watch Series 5 supports watchOS 10 and future updates that ensure long-term software compatibility.
  • Apple Watch Series 3 supports up to watchOS 8 and no longer receives updates.
Winner:

Apple Watch Series 5

Connectivity:

  • Apple Watch Series 5 supports Bluetooth 5.0, 2.4GHz Wi-Fi bands for better wireless performance.
  • Apple Watch Series 3 uses Bluetooth 4.2 and older Wi-Fi standards.
Winner:

Apple Watch Series 5

Health Features:

  • Apple Watch Series 5 includes ECG, high/low heart rate and emergency SOS to support advanced fitness tracking.
  • Apple Watch Series 3 provides basic activity and heart rate tracking.
Winner:

Apple Watch Series 5 (See Also: Apple Watch Se 3 Vs Ultra 3 )

Speaker & Microphone:

  • Apple Watch Series 5 includes enhanced microphone and speaker that improve call and Siri clarity.
  • Apple Watch Series 3 has a basic mic and speaker configuration.
Winner:

Apple Watch Series 5

Internal Storage:

  • Apple Watch Series 5 has 32GB of storage that allows space for more music, photos, and apps.
  • Apple Watch Series 3 comes with 8GB of storage.
Winner:

Apple Watch Series 5

Battery Life:

  • The Apple Watch Series 5 offers 18-hour battery life that supports all-day use with advanced features enabled.
  • Apple Watch Series 3 comes with up to 16 hours of battery life.
Winner:

Apple Watch Series 5

Resolution:

  • Apple Watch Series 5 includes a 368 x 448 resolution that delivers sharper text and app visuals.
  • Apple Watch Series 3 has a resolution of 312 x 390 pixels.
Winner:

Apple Watch Series 5

Check Apple Watch Series 5 Best Price
Check Apple Watch Series 3 Best Price

Specs at a Glance

FeatureApple Watch Series 5Apple Watch Series 3
Display TypeAlways-On LTPO OLEDRegular OLED
Display Size1.78 inches1.65 inches
Display Brightness1000 nits1000 nits
ProcessorS5 SiP with 64-bit dual-coreS3 dual-core
RAM1GB768MB
Storage32GB8GB
Battery LifeUp to 18 hoursUp to 16 hours
Fast ChargingNoNo
Cellular OptionYesNo
Wi-Fi2.4GHz only2.4GHz only
Bluetooth5.04.2
Water ResistanceUp to 50 metersUp to 50 meters
Heart Rate SensorOptical + ElectricalOptical
Fall DetectionYesNo
CompassYesNo
Always-On DisplayYesNo
Noise AppYesNo
International SOSYesNo
On-device SiriYesNo
Operating SystemwatchOS 10 (latest supported)watchOS 8.7.1 (max support)

 

Who Should Buy What?

Buy the Apple Watch Series 5 if you:

  • Want a larger, always-on display that shows information at a glance.
  • Need advanced health tools like ECG and fall detection.
  • Prefer on-device Siri for faster voice commands.
  • Want more internal storage for apps and music.
  • Need cellular connectivity for phone-free use during workouts.

Check Apple Watch Series 5 Best Price (See Also: Apple Watch Se 3 Vs Ultra 2 )

Buy the Apple Watch Series 3 if you:

  • Want a basic Apple Watch at the lowest possible price.
  • Only need core fitness and activity tracking.
  • Don’t mind an older design with smaller display.
  • Prefer simplicity and fewer apps or storage needs.
  • Don’t need cellular or advanced health features.

Check Apple Watch Series 3 Best Price

Winner by Category

CategoryWinner
ProcessorApple Watch Series 5
DisplayApple Watch Series 5
Display SizeApple Watch Series 5
Higher ResolutionApple Watch Series 5
Display BrightnessTie
Dual Speaker SystemApple Watch Series 5
Internal StorageApple Watch Series 5
Wi-FiApple Watch Series 5
Health & Fitness FeaturesApple Watch Series 5
On-Device SiriApple Watch Series 5
MicrophoneApple Watch Series 5
LTE ConnectivityApple Watch Series 5
DesignApple Watch Series 5

What They Have in Common

  • Retina Display: Both the Series 3 and Series 5 feature a bright Retina display that ensures text and graphics are easy to read in various lighting conditions.
  • Water Resistance: Both models are water-resistant up to 50 meters, making them suitable for swimming and tracking workouts in the pool.
  • Heart Rate Monitoring: Each watch includes an optical heart rate sensor that helps users track their heart health and monitor resting, walking, and workout heart rates.
  • Fitness Tracking: Both models offer comprehensive fitness tracking features, including step counting, calorie burn, and activity rings to encourage daily movement.
  • Notifications and Calls: Each watch allows you to receive notifications, answer calls, and respond to messages directly from your wrist, improving convenience.

FAQ (Quick Answers)

Does the Apple Watch Series 5 have better performance than the Series 3?
Yes, the Apple Watch Series 5 uses the faster S5 processor, which provides smoother app loading and better efficiency compared to the older S3 chip in the Series 3.

Can the Apple Watch Series 5 work without an iPhone nearby?
Yes, the GPS + Cellular version of the Apple Watch Series 5 can make calls, send texts, and stream music independently when activated with a carrier plan.

Is the Apple Watch Series 3 still supported by the latest watchOS updates?
No, the Apple Watch Series 3 is limited to watchOS 8 and does not support watchOS 9 or later, meaning it no longer receives major feature updates.

Does the Series 5 support ECG and fall detection?
Yes, the Apple Watch Series 5 includes both ECG capability and fall detection, which are not available on the Series 3.

Can both watches be used while swimming?
Yes, both the Apple Watch Series 5 and Series 3 are water resistant up to 50 meters and are suitable for swimming and water-based workouts.

Is there a difference in display technology between Series 5 and Series 3?
Yes, the Series 5 features an always-on Retina LTPO OLED display that stays visible without wrist movement, while the Series 3’s display turns off when not in use. (See Also: Apple Watch Se 3 Vs Series 10 )

How much storage does each model have?
The Apple Watch Series 5 comes with 32GB of internal storage, whereas the Series 3 only has 8GB, limiting app and music storage.

Does the Series 5 support on-device Siri?
Yes, the Apple Watch Series 5 supports on-device Siri for faster responses and limited offline functionality, unlike the Series 3 which requires a network connection.

Are both watches compatible with iPhones?
Yes, but the Series 5 requires an iPhone running iOS 17 or later, while the Series 3 is compatible with iPhones running iOS 15 or earlier.

🔥 Read More:

Which watch is better for future-proofing?
The Apple Watch Series 5 is better for future-proofing because it supports newer software updates, has more health features, and includes a more modern display and processor.

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