Apple Watch Series

About Apple Watch Series

The Apple Watch Series is the middle of Apple's three watch lines and the one refreshed most predictably, once a year. It sits above the SE, which drops sensors and screen brightness to hit a lower price, and below the Ultra, which adds size, battery and outdoor hardware most people will never use. This entry covers the line rather than a single year, so there is no one case size, sensor list or price that describes every Series watch. What has held constant since the line began is that the Series is where Apple puts the newest health sensors first and where the always on display arrived. If you want the full set of what an Apple Watch can measure, without a case the size of a diving watch, this is the model that has it.

Where the Series sits in the Apple Watch range

Apple sells three watches at once. The SE is the entry model, aimed at first time buyers, children and people who want notifications and step counting without paying for the full sensor set. The Series is the mainstream watch. The Ultra is a single large size built for open water, altitude and long days away from a charger.

The gap between the three is mostly sensors, screen brightness and battery. MacRumors sets it out cleanly: 1,000 nits on the SE, 2,000 on the Series and 3,000 on the Ultra; 18 hours of battery on the SE, 24 on the Series and 42 on the Ultra; and a second generation optical heart sensor on the SE against the third generation sensor plus the ECG app, the blood oxygen app and hypertension notifications on the Series and Ultra.

That middle row is the reason the Series exists. It is the cheapest Apple Watch with the complete health sensor set.

What the current generation is

Apple's specification page for the current Series lists two case sizes, 42mm and 46mm, in aluminium or titanium. The display is an always on Retina panel using wide angle OLEDs and LTPO3, running from 1 nit up to 2,000 nits peak. The chip is the S10, a 64 bit dual core processor with a 4 core Neural Engine, alongside 64GB of storage.

The sensor list is the long one: electrical heart sensor, third generation optical heart sensor, blood oxygen sensor, temperature sensor, compass, altimeter, accelerometer, gyroscope, ambient light sensor, a depth gauge good to 6 metres and a water temperature sensor. Apple rates the case at 50m water resistance and IP6X for dust.

Battery is quoted as up to 24 hours of normal use, or up to 38 hours in low power mode, with about 80 percent charge in 30 minutes on the included fast charger. Wireless covers Bluetooth 5.3, Wi-Fi, multi constellation GPS and a second generation ultra wideband chip, with 5G RedCap and LTE on the cellular models.

Who the Series is for

This is the watch for someone who wants the health features to be the point rather than a bonus. The electrical heart sensor and the ECG app, the blood oxygen reading, the temperature sensing and the notification features Apple layers on top of them are the reason to choose this line over the SE, and none of them are available on the cheaper watch.

It also suits people who want the watch to look like a watch. The 42mm and 46mm cases are ordinary wristwatch sizes, and the titanium finishes are dressier than anything in the Ultra range. Somebody who wears a watch to work and to the gym is better served here than by a 49mm case.

And it suits people who charge overnight. Twenty four hours is enough for a day and an evening, and the fast charger fills most of it during a shower. It is not enough for a multi day trip without bringing the charger, which is the honest limit of the line.

Series against the SE

The SE is the better buy more often than its position in the range suggests. It tracks workouts, counts steps, delivers notifications, runs the same software and takes the same bands. What it does not do is the clinical sensor set, and it has a dimmer screen and shorter battery.

MacRumors places the SE at 249 to 329 US dollars and the Series at 399 to 749, and points the SE at budget conscious buyers, children, older wearers and people trying an Apple Watch for the first time. That is a fair description. If nobody in the household is going to open the ECG app, the money is better spent elsewhere.

The counter argument is that the sensors are the part you cannot add later, and the watch is likely to be worn for four or five years.

Series against the Ultra

The Ultra is bigger, brighter, tougher and lasts much longer, and it costs roughly twice as much. Tom's Guide puts the Series at 399 US dollars for GPS or 499 with cellular, against 799 for the Ultra with cellular included, and concludes that the Series is the pick for most people on price and comfort, with the Ultra reserved for those who really need the durability, the battery life and the off grid communication.

The specific Ultra features worth paying for are satellite messaging, 100m water resistance with a dive rating, the Action button, and a screen readable in direct sun at 3,000 nits. If you dive, hike beyond mobile coverage, or run events longer than a day, those are real. If your longest time away from a charger is a working day, they are not.

Who should buy something else

Buy the SE instead if the watch is for a child, an older relative or a first time wearer, or if you know you will not use the clinical sensors. It runs the same software and does the everyday things identically.

Buy the Ultra instead if you are regularly out of mobile coverage, dive, or need more than a day of battery between charges. No configuration of the Series solves those.

Buy a dedicated sports watch instead if multi day battery matters more than anything else. Watches built around long battery life run for weeks rather than a day, and that is a design choice the Apple Watch has not made.

Do not buy any Apple Watch if you carry an Android phone. The watch pairs only with an iPhone, and there is no version of this line that changes that.

And skip the upgrade if you own a Series watch from the last two or three years. The yearly changes on this line are small, and the sensor additions that would justify replacing a working watch do not arrive every year.