The Apple Watch has received some incremental updates in recent years, with significant upgrades becoming fewer and farther between as the device has progressed. Since the Apple Watch's generation-over-generation enhancements are relatively small, it is all the more important to consider when an upgrade is justified and whether an older model could suffice for your needs.The Apple Watch Series 12 brings a more substantial set of changes than the Series 11, which was one of the smallest refreshes in the device's history. While Apple has discontinued previous Series models, older watches may still be available at lower prices from third-party retailers or secondhand.Read on to see the breakdown below for each new feature, change, and improvement that was added with each Apple Watch model compared to its direct predecessor. Viewing each generation's changes in this way helps weigh up the accumulative upgrades one receives by skipping multiple generations when buying a new device, as well as get a sense of which generations offered the biggest overall upgrades.Apple Watch Series 12 (2026)S11 chip (based on A20 Pro)4GB of RAMNew Health Sensing SystemSecond-generation electrical heart sensorFourth-generation, always-on optical heart sensorBackground heart rate measurements every five seconds throughout the dayHeart rate variability measured up to 24x more oftenRecovery HRV metricReadiness appDaytime view in the Vitals appMore accurate step trackingSteps and real-time heart rate watch face complicationsAudio Intelligence with Sound Recognition and automatic Shazam detectionLive Rewind and Siri RecapCeramic Shield 2 front glass, 60% tougher than Series 11's Ion-X glass (aluminum models only)Aluminum or titanium and zirconia back replaces metal and sapphire crystal backUp to 10 hours of outdoor workout tracking (25% longer than Series 11)15 minutes of charging provides up to 12 hours of normal use (up from eight hours)Five minutes of charging provides up to 10 hours of sleep tracking (up from eight hours)Aluminum and titanium cases are 1mm wider and around two grams heavierSlightly larger bezels and display area is approximately 2% smaller despite unchanged screen resolutionsCeramic case option introduced in Pearl White and Night Blue, with slightly larger dimensions than aluminum and titanium modelsDark Bronze, Light Gold, and Black aluminum finishes replace Silver, Rose Gold, and Jet Black; Space Gray remains availableRadiant Gold titanium replaces Gold and Slate; Natural titanium remains availableApple Watch Series 11 (2025)2x more scratch-resistant Ion-X glass (aluminum models only)5G connectivity (cellular models only)7–10% larger batterySpace Gray aluminum option reintroducedApple Watch Series 10 (2024)Refined design with a thinner casing, display with more rounded edges and a wider aspect ratio, and front glass that extends further over the sides for a higher screen-to-body ratio42mm and 46mm case sizesLarger displaysLTPO3 display for faster refresh rate in always-on mode, enabling a live ticking seconds hand on select watch facesWide-angle OLED (up to 40% brighter when viewed at an angle)S10 chip (same CPU as S9, but more compact)Water temperature sensor Depth app and Depth gauge to 6mMicrophone with voice isolationRedesigned speaker with media playbackMetal back with larger charging coil and integrated antennaFaster charging (0–80% in about 30 minutes)Titanium casing replaces stainless steel option, now in Silver (matches previous stainless steel casing, Apple Watch Hermès only), Gold, Slate, and NaturalStarlight, Midnight, Pink, and (PRODUCT)RED finishes discontinued, replaced with Silver, Rose Gold, and polished Jet Black finishesApple Watch Series 9 (2023)Retina display with up to 2,000 nits of brightnessDisplay can get dimmer in dark rooms and at night (down to 1 nit of brightness)Double tap gestureWrist flick gestureSleep apnea detectionHypertension detectionS9 chip (based on A15 Bionic)2GB of RAM4-core Neural Engine (2x faster than Series 8)‌Siri‌ processed on-device for requests that do not need information from the internet‌Siri‌ can access health and fitness data25% more accurate dictationSecond-generation Ultra Wideband chipPrecision Finding for iPhone 15 modelsHomePod proximity integration64GB storagePink aluminum casing introducedApple Watch Series 8 (2022)S8 chip (same CPU as S6)More powerful gyroscope and high dynamic range accelerometerCrash DetectionBody temperature sensorWrist temperature sensing during sleepmemCycle tracking with retrospective ovulation estimatesBlue and Green aluminum casings discontinued, Silver aluminum reintroducedApple Watch Edition discontinuedApple Watch Series 7 (2021)41mm and 45mm case sizes1.7mm display borders for almost 20% more screen area than Series 6QWERTY keyboardUp to 70% brighter display than Series 6 indoors when wrist is downS7 chip (Same CPU as S6)Crack-resistant front crystal (50% thicker)IP6X dust resistanceFast charging for up to 80% charge in about 45 minutes (33% faster than Series 6)Silver and Space Gray aluminum casings discontinued, Midnight, Starlight, and Green introducedApple Watch Series 6 (2020)Up to 2.5x brighter always-on displayAccess Notification Center, Control Center, and Complications when display is asleepS6 chip (based on A13 Bionic, 20% faster than S5)1.5GB of RAMAlways-on altimeterFirst-generation Ultra Wideband chip2.4GHz and 5GHz Wi-FiBlood oxygen sensorFaster charging for a full charge in under 1.5 hoursImproved battery life for tracking certain workouts, such as indoor and outdoor runsBlue and (PRODUCT)RED aluminum casing options introducedSpace Black stainless steel casing available with Apple Watch Hermès only, Graphite option introducedCeramic Apple Watch Edition discontinuedApple Watch Series 5 (2019)Always-on Retina displayForce Touch removedS5 chipCompass32GB storageApple Watch Edition reintroduced with White Ceramic, Natural Titanium, and Space Black Titanium casing optionsApple Watch Series 4 (2018)40mm and 44mm case sizesOver 30% larger display with curved corners3.0mm display bordersS4 chip (2x faster than S3)Gyroscope and accelerometerBarometric altimeterFall detection2.4GHz Wi-FiOptical heart sensor and electrical heart sensor for ECG16GB storageDigital Crown with haptic feedback50% louder speakerRelocated microphone for reduced echo and better sound qualityFaster charging for a full charge in 1.5 hoursGold stainless steel casing introducedApple Watch Edition discontinuedApple Watch Series 3 (2017)S3 chip (70% faster than S2)Barometric altimeterBluetooth 4.2‌Siri‌ able to speak through the onboard speakerLTE cellular model available with red Digital CrownRose Gold aluminum casing discontinuedGray Ceramic Apple Watch Edition model introducedApple Watch Series 2 (2016)Retina display with up to 1,000 nits of brightness (2x brighter than previous generation)S2 chip (dual‑core)1GB of RAMGPS and GLONASS receiver Water resistant up to 50 metersGold and Rose Gold aluminum casing options added18K Gold and Rose Gold Apple Watch Edition discontinued, Ceramic model introduced in WhiteApple Watch Nike+ variant introducedThe Series 12 has a stronger case than the Series 11 as an upgrade in general, but most Series 11 owners still have little reason to get a new device. Its new heart sensors, more frequent HRV measurements, Readiness app, and longer workout battery life matter most if you rely on your Apple Watch for training and recovery insights. Sound Recognition may also appeal to deaf or hard of hearing users, while the ceramic case offers a finish unavailable with the Series 11. Upgrading from a Series 10 brings these changes alongside the Series 11's 5G connectivity on cellular models and longer rated everyday battery life. From a Series 9, you would also gain the thinner Series 10 design, larger display, depth gauge, and water temperature sensor.The cumulative upgrades become more compelling for Series 8 users and older, particularly if battery wear is affecting daily use. Series 7 owners gain Crash Detection and temperature sensing as well as the newer design and Series 12 health features. The biggest differences will be felt by those with a Series 6 or older, though the condition of your current watch and the cost of replacing it still matter.watchOS 27 supports Series 9 and later, leaving the Series 8 and older without the latest major software release. That does not mean they will immediately stop working or receiving all security updates, but they are now considered old devices. If you are shopping for a replacement, a discounted or secondhand Series 11 may offer better value if you do not need the Series 12's health features, providing you can find it at a sufficiently low price. watchOS 26 is not supported by the Series 5 or older, so anyone with one of these devices should definitely consider upgrading soon. Looking to the future, it looks like next year's Apple Watch Series 13 could offer some major upgrades including a redesign and new sensors. This could make it a great upgrade for those with a Series 11 or older. Related Roundup: Apple Watch 12Buyer's Guide: Apple Watch (Buy Now)Related Forum: Apple WatchThis article, "Upgrading From an Older Apple Watch? Here's How the New Features Stack Up" first appeared on MacRumors.comDiscuss this article in our forums