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Apple Watch Series 8 vs. SE: Which One Is Right for You?

The Series 8’s extra health-tracking features, faster charging and always-on display separate it from the SE.

Deciding on a new Apple Watch can be challenging, especially if you’re choosing between the $399 Apple Watch Series 8 and the $249 Apple Watch SE.

Unless you’re an avid scuba diver or rock climber — or want to look like one — you’re probably not considering the $799 Apple Watch Ultra. The Series 8 and SE are both intended for everyday wearers that want to keep an eye on their health and fitness levels, but don’t need the Ultra’s larger screen, longer battery life and extra features tailored for the outdoors. 

Both the Series 8 and SE run on Apple’s WatchOS 9 software, have the company’s newest chip and are among the first to detect car crashes. That’s in addition to the functionality Apple’s watches have offered for years, like the ability to track workouts, detect hard falls and mirror iPhone alerts.

Which one is right for you depends on what you want in a smartwatch. As someone who primarily uses my Apple Watch for logging exercise, viewing notifications and checking the time, there’s little that I missed when switching from the Series 8 to the SE after testing both.

The biggest reason to choose the Series 8 over the SE right now is its extra health-tracking smarts, such as its new wrist temperature measurements, blood oxygen saturation readings and the ability to take an electrocardiogram. The Apple Watch isn’t a medical device and shouldn’t be treated as such. But those who want more data on their cardiac and respiratory health to share with their doctors might find the Series 8 to be the better choice.

I think the Series 8’s main benefits will become more clear over the long term. Temperature sensing is still new, but I like the idea of being able to see how changes in my baseline temperature may correlate with how I’m feeling that day. The Series 8’s ultrawideband chip, which isn’t present in the SE, may also feel more valuable in a future where unlocking your car with your phone or watch is just as common as using Apple Pay at the checkout counter.

Apple Watch Series 8 with rainbow display on blue background

A larger screen with an always-on display

If you were to ask me what I’ve missed most about using the Apple Watch SE, it’s the always-on display found on the Series 8 and other flagship Apple Watches since 2019. Without an always-on display, the Apple Watch SE’s screen just turns into a black box on my wrist, which isn’t exactly the most attractive look. 

When wearing the Series 8 (or the Series 5, 6 or 7), I can view my watch face anytime without having to raise my wrist or touch the watch. I don’t think the always-on display alone is worth paying an extra $150 if you don’t care about the other health extras that come with the Series 8. But I do wish the always-on display was standard across all Apple Watches at this point.

The Apple Watch Series 8 also has a larger display and comes in 41- and 45-millimeter case sizes, compared to the 40 or 44mm SE. Having a bigger display is nice, but the only thing I missed is the Series 8’s QWERTY keyboard for typing responses to text messages (the Series 7 has this too). On the SE, you can still scribble letters, dictate words or send canned responses, but I like the flexibility of being able to quickly type a couple of words. Those who prefer larger text sizes may also want to choose the Series 8 over the SE.

The Series 8 is also available in a pricier stainless steel finish, and the aluminum version comes in an additional Product Red color option not available on the SE. 

Apple Watch Series 8 and iPhone with Health app showing temperature readings

More health tracking

Apple’s flagship watches like the Series 8 have evolved into comprehensive health-tracking devices, with the ability to take an ECG from your wrist and monitor blood oxygen levels. The Series 8 and Ultra are the first to get temperature sensors, enabling them to check your wrist temperature overnight and show whether you’ve deviated from your baseline. It takes five nights to set up temperature sensing, since the watch needs enough time to establish your baseline wrist temperature.

Apple says nighttime wrist temperature can be an indicator of overall body temperature, and changes could possibly be caused by illness, jet lag or exercise. Since the Apple Watch doesn’t have a readiness score like Oura or Fitbit, I could see this information being useful for helping me decide whether my body needs extra rest.

I’m hoping Apple weaves wrist temperature readings into new features and insights in the future. Right now, you can see a chart showing how your nighttime temperature readings deviate from your baseline. But it generally seems like it’s up to you to interpret these readings. 

A chart from the Apple Health app showing wrist temperature data from the Apple Watch Series 8.

The Apple Watch isn’t a medical device and can’t alert you when you’re sick, so it can be hard to know how to use this data. That’s part of the reason why I never check my blood oxygen levels; it’s just another statistic that I’m not sure what to make of. I’ve been wearing the Apple Watch Series 8 consistently for a couple of weeks, but I’m still not sure what to do with this temperature data. 

My nighttime wrist temperature is pretty close to my baseline most of the time, but it’s usually a fraction of a degree higher or lower. Sometimes my deviations are as high as 0.37 degrees Fahrenheit above my baseline or 0.55 degrees below the norm. I can’t connect the dots between those deviations and what may have happened to cause them. It’s also difficult to wear the Apple Watch Series 8 consistently overnight since I have to charge it during some evenings.

Still, having another data point like wrist temperature opens up some interesting opportunities for the future. I’m hoping Apple finds new ways to crunch all of these statistics together to enable new insights and actionable advice. Until then, nighttime wrist temperature is yet another metric you can potentially share with your doctor if you’re not feeling well, but it’s difficult to tell how useful it actually is. 

For now, the biggest application for the Series 8’s temperature sensing will likely be fertility tracking. Apple says the Series 8 and Ultra can provide retrospective ovulation estimates and improved period tracking, potentially making the Series 8 a better choice for those who are interested in using it for family planning purposes. That information can be helpful because it provides users with data from their own bodies, rather than just making estimates based on the length of their cycle.

«But this actually gives you real life data because the time of ovulation can vary from person to person from month to month,» said Dr. Angela Bianco, MD, director of maternal fetal medicine at the Mount Sinai Health System. «Some people ovulate earlier in their cycles, others ovulate later in their cycles.»

Again, the Apple Watch isn’t a medical device and shouldn’t be treated as such. It also shouldn’t be used for contraception.

«I stress that women who are trying not to get pregnant should not use this because there can be errors in the data,» said Dr. Alexis Melnick, an OBGYN at NewYork-Presbyterian and assistant professor at Weill Cornell Medicine. «And you can have a cycle that is variable that may not follow the regular pattern.» 

Apple says data stored in the health app — including female health statistics like ovulation estimates — is encrypted when your iPhone is locked with a passcode, Face ID or Touch ID. The same goes for data backed up to iCloud. 

You’ll also want to make sure two-factor authentication is enabled for your iCloud account, which should be turned on by default. This ensures that health data is end-to-end encrypted, meaning Apple cannot read or access your data. To make sure two-factor authentication is on, open the Settings menu on your iPhone, tap your name and choose the Password & Security option. 

Apple Watch SE on wrist showing battery percentage

Other extras, like faster charging and ultrawideband

While the Series 8’s extra health sensors are the biggest reason to potentially choose it over the SE, there are a few other extras to consider. The Series 8 can charge more quickly than the SE, as it inherits the fast-charging capabilities of the Series 6 and 7. The Apple Watch Series 8 charged from 70% to 80% in 10 minutes, while the SE charged from 70% to 77% over the same time period. For each watch, I used the included charging cable and the same power adapter plugged into the same outlet. Both watches have Apple’s new low power mode, which dials back certain features like automatic workout detection to extend battery life.

The Series 8, like the Series 6 and 7, also have Apple’s U1 ultrawideband chip. Ultrawideband is a wireless protocol for proximity sensing that’s become common in new flagship phones and smartwatches. Ultrawideband is primarily used for finding misplaced items and gadgets using Apple’s Find My service, or for unlocking your car with more precision than Bluetooth. 

If you have a car that’s compatible with ultrawideband, for example, you can unlock your vehicle automatically as you approach it with your Apple Watch. Ultrawideband is said to be more secure and precise than Bluetooth when functioning as a key, which you can read more about here. It’s a nice perk, but it’s likely not a necessity for everyone. At least not yet. 

The bottom line

The Apple Watch Series 8 and SE have a lot in common when it comes to core features and functionality. They can both track workouts, show iPhone notifications, provide high and low heart rate notifications and detect irregular heart rhythms. They also both come with safety features like emergency SOS, fall detection and car crash detection, the latter of which is exclusive to Apple’s 2022 smartwatches. The new Compass app, which includes a new feature to help you retrace your steps, is also coming to both watches as well as the Series 7, Series 6 and first-generation SE. 

If you like using Apple Pay or syncing your Apple Watch to the treadmill at your local gym through GymKit, you’ll do just fine with either the new SE or the Series 8. They both have the same processor, support low power mode and run on Apple’s new WatchOS 9 update. 

The difference really comes down to health tracking. By choosing the SE, you’ll miss out on the Apple Watch’s ECG app, blood oxygen sensor and new temperature sensor. Whether those features are necessary depends on what you hope to get out of your smartwatch. Do you primarily want to track workouts, or are you looking for deeper health metrics to share with your doctor? 

You’ll also get a few perks that make the Series 8 a better iPhone companion, such as a larger always-on display, faster charging and ultrawideband support. Of those features, I personally find the always-on display to be most useful. 

Overall, the Series 8 seems poised to become more useful over time, especially after I’ve had more time to test the temperature sensor. Ultrawideband is another feature I’m expecting to become more useful in the long term as using mobile devices as digital keys starts to become more common. But for now, ultrawideband alone shouldn’t be a deciding factor; it’s more about the sum of how all of these parts come together. 

The Series 8 is the right option for those who want more health-tracking features and are willing to pay a premium for it. The Apple Watch SE is the best choice for those who are upgrading from an older watch or are buying an Apple Watch for the first time and just want an Apple Watch that feels new and has all of the core features. But if you have a recent Apple Watch like the Series 5, you can probably hold off on upgrading entirely unless you really want Apple’s new health upgrades. 

Apple Watch Series 8 vs. SE

Apple Watch Series 8 Apple Watch SE
Starting price $399 $249
Size 41mm or 45mm 40mm or 44mm
Finishes Aluminum or stainless steel Aluminum
Colors Aluminum: Midnight, starlight, silver, Product Red; Stainless steel: Graphite, silver, gold Midnight,starlight, silver
Software WatchOS 9 WatchOS 9
Screen 904 sq mm display area (41mm); 1,143 sq mm display area (45mm) 759 sq mm display area (40mm); 977 sq mm display area (44mm)
Health sensors Blood oxygen, electrical heart (ECG),third-gen optical heart, temperature Second-gen optical heart
Health features High and low heart rate notifications, irregular heart rate notifications, blood oxygen, nighttime wrist temperature deviations, cardio fitness level, cycle tracking, retrospective ovulation estimates, sleep tracking High and low heart rate notifications, irregular heart rate notifications, cardio fitness level, cycle tracking, sleep tracking
Chip Apple S8 SiP Apple S8 SiP
Durability IP6X dust resistant;water resistant up to 50m Water resistant up to 50m
Safety Emergency SOS, international emergency calling, crash detection, fall detection Emergency SOS, international emergency calling, crash detection, fall detection
Battery Up to 18 hours with fast charging, support for low power mode Up to 18 hours, support for low power mode
Storage 32GB 32GB
Other features GPS, optional cellular, Compass Backtrack, always on altimeter, Family Setup, speaker, microphone, activity and exercise tracking, Apple Pay, GymKit, ultrawideband support GPS, optional cellular, Compass Backtrack, always on altimeter, Family Setup, speaker, microphone, activity and exercise tracking, Apple Pay, GymKit

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Tariffs Explained: Latest on Trump’s Shifting Import Tax Plan, and What It Means

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Apple, I’m (Sky) Blue About Your iPhone 17 Air Color

Commentary: The rumored new hue of the iPhone 17 Air is more sky blah than sky blue.

I can’t help but feel blue about the latest rumor that Apple’s forthcoming iPhone 17 Air will take flight in a subtle, light-hued color called sky blue.

Sky blue isn’t a new color for Apple. It’s the featured shade of the current M4 MacBook Air, a shimmer of cerulean so subtle as to almost be missed. It’s silver left too close to an aquarium; silver that secretly likes to think it’s blue but doesn’t want everyone else to notice.

Do Apple employees get to go outside and see a real blue sky? It’s actually vivid, you can check for yourself. Perhaps the muted sky blue color reflects a Bay Area late winter/early spring frequent layer of clouds like we typically see here in Seattle.

«Who cares?» you might find yourself saying. «Everyone gets a case anyway.» I hear you and everyone else who’s told me that. But design-focused Apple is as obsessive about colors as they are about making their devices thinner. And I wonder if their heads are in the clouds about which hues adorn their pro products.

Making the case for a caseless color iPhone

I’m more invested in this conversation than most — I’m one of those freaks who doesn’t wrap my phone in a case. I find cases bulky and superfluous, and I like to be able to see Apple’s design work. Also, true story, I’ve broken my iPhone screen only twice: First when it was in a «bumper» that Apple sent free in response to the iPhone 4 you’re-holding-it-wrong Antennagate fiasco, and second when trying to take long exposure starry night photos using what I didn’t realize was a broken tripod mount. My one-week-old iPhone 13 Pro slipped sideways and landed screen-first on a pointy rock. A case wouldn’t have saved it.

My current model is an iPhone 16 Pro in black titanium — which I know seems like avoiding color entirely — but previously I’ve gone for colors like blue titanium and deep purple. I wanted to like deep purple the most but it came across as, in the words of Patrick Holland in his iPhone 14 Pro review, «a drab shade of gray or like Grimace purple,» depending on the light.

Pros can be bold, too

Maybe the issue is too many soft blues. Since the iPhone Pro age began with the iPhone 11 Pro, we’ve seen variations like blue titanium (iPhone 15 Pro), sierra blue (iPhone 13 Pro) and pacific blue (iPhone 12 Pro).

Pacific blue is the boldest of the bunch, if by bold you mean dark enough to discern from silver, but it’s also close enough to that year’s graphite color that seeing blue depends on the surrounding lighting. By comparison, the blue (just «blue») color of the iPhone 12 was unmistakably bright blue.

In fact, the non-Pro lines have embraced vibrant colors. It’s as if Apple is equating «pro» with «sophisticated,» as in «A real pro would never brandish something this garish.» I see this in the camera world all the time: If it’s not all-black, it’s not a «serious» camera.

And yet I know lots of pros who are not sophisticated — proudly so. People choose colors to express themselves, so forcing that idea of professionalism through color feels needlessly restrictive. A bright pink iPhone 16 might make you smile every time you pick it up but then frown because it doesn’t have a telephoto camera.

Color is also important because it can sway a purchase decision. «I would buy a sky blue iPhone yesterday,» my colleague Gael Cooper texted after the first rumor popped online. When each new generation of iPhones arrive, less technically different than the one before, a color you fall in love with can push you into trading in your perfectly-capable model for a new one.

And lest you think Apple should just stick with black and white for its professional phones: Do you mean black, jet black, space black, midnight black, black titanium, graphite or space gray? At least the lighter end of the spectrum has stuck to just white, white titanium and silver over the years.

Apple never got ahead by being beige

I’m sure Apple has reams of studies and customer feedback that support which colors make it to production each year. Like I said, Apple’s designers are obsessive (in a good way). And I must remind myself that a sky blue iPhone 17 Air is a rumored color on a rumored product so all the usual caveats apply.

But we’re talking about Apple here. The scrappy startup that spent more than any other company on business cards at the time because each one included the old six-color Apple logo. The company that not only shaped the first iMac like a tipped-over gumdrop, that not only made the case partially see-through but then made that cover brilliant Bondi blue.

Embrace the iPhone colors, Apple.

If that makes you nervous, don’t worry: Most people will put a case on it anyway.

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Astronomers Say There’s an Increased Possibility of Life on This Distant Planet

Using the James Webb Space Telescope, astronomers are working to confirm potential evidence of life on a distant exoplanet dubbed K2-18b.

Astronomers are nearing a statistically significant finding that could confirm the potential signs of life detected on the distant exoplanet K2-18b are no accident.

The team of astronomers, led by the University of Cambridge, used data from the James Webb Space Telescope (which has only been in use since the end of 2021) to detect chemical traces of dimethyl sulfide (DMS) and/or dimethyl disulfide (DMDS), which they say can only be produced by life such as phytoplankton in the sea. 

According to the university, «the results are the strongest evidence yet that life may exist on a planet outside our solar system.»

The findings were published this week in the Astrophysical Journal Letters and point to the possibility of an ocean on this planet’s surface, which scientists have been hoping to discover for years. In the abstract for the paper, the team says, «The possibility of hycean worlds, with planet-wide oceans and H2-rich atmospheres, significantly expands and accelerates the search for habitable environments elsewhere.»

Not everyone agrees, however, that what the team found proves there’s life on the exoplanet.

Science writer and OpenMind Magazine founder Corey S. Powell posted about the findings on Bluesky, writing, «The potential discovery of alien life is so enticing that it drags even reputable outlets into running naive or outright misleading stories.» He added, «Here we go again with planet K2-18b.Um….there’s strong evidence of non-biological sources of the molecule DMS.»

K2-18b is 124 light-years away and much larger than Earth (more than eight times our mass), but smaller than Neptune. The search for signs of even basic life on a planet like this increases the chances that there are more planets like Earth that may be inhabitable, with temperatures and atmospheres that could sustain human-like lifeforms. The team behind the paper hopes that more study with the James Webb Space Telescope will help confirm their initial findings.

More research to do on finding life on K2-18b

The exoplanet K2-18b is not the only place where scientists are exploring the possibility of life, and this research is still an early step in the process, said Christopher Glein, a geochemist, planetary researcher and lead scientist at San Antonio’s Southwest Research Institute. Excitement over the significance of the research, he said, should be tempered.

«We need to be careful here,» Glein said. «It appears that there is something in the data that can’t be explained, and DMS/DMDS can provide an explanation. But this detection is stretching the limits of JWST’s capabilities.»

Glein added, «Further work is needed to test whether these molecules are actually present. We also need complementary research assessing the abiotic background on K2-18b and similar planets. That is, the chemistry that can occur in the absence of life in this potentially exotic environment. We might be seeing evidence of some cool chemistry rather than life.»

The TRAPPIST-1 planets, he said, are being researched as potentially habitable, as is LHS 1140b, which he said «is another astrobiologically significant exoplanet, which might be a massive ocean world.»

As for K2-18b, Glein said many more tests need to be performed before there’s consensus on life existing on it.

«Finding evidence of life is like prosecuting a case in the courtroom,» Glein said. «Multiple independent lines of evidence are needed to convince the jury, in this case the worldwide scientific community.» He added, «If this finding holds up, then that’s Step 1.»

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