Smartwatches are very much a mainstream tech category now, and with 35 million expected to be bought in 2018, there are many contenders for the crown of best smartwatch.

Everyone from Apple, Fitbit, Samsung, Fossil, Tag Heuer, Garmin, Huawei and LG are creating a boom in popularity...and it's tougher than ever to choose.

So, whether you're looking for a top fitness smartwatch, the best smartwatch for your iPhone, the pick of the Wear OS bunch, or simply a good smartwatch for less than $200 we have the current best picks and upcoming devices.

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The best smartwatch you can buy now
Apple Watch Series 3

Apple Watch Series 3: Key specs
OS: watchOS 4Display: OLEDSize: 38mm/42mmBattery: 2 daysWater resistance: 50mHeart rate: YesConnectivity: LTE, GPS, NFC, Wi-Fi, BluetoothWorks with: iOSPros: LTE brings new freedom | Faster performanceCons: Additional monthly LTE cost | 3rd-party apps lacking
Feature check: GPS, swimming friendly, Apple Pay, 2 day battery, heart rate monitor.

Part smartwatch, part fitness tracker, and a much, much better wearable than what we first got in 2015, the Apple Watch Series 3 is still far from perfect and Wear has caught up in terms of features, technology and style, but as far as the overall smartwatch experience goes, Apple is still doing the best work here.

This is Apple's first cellular smartwatch, letting you cut the invisible tether to take it out sans iPhone and still make/receive calls, get texts and all other notifications you would on your phone.

The Series 3 is also heavily focused on fitness, with built-in GPS that we've found to be impressively accurate, and 50m waterproofing so it's one of the best smartwatches for swimming as well.

The Apple Watch Series 3 is about those windows through the day where a cellular watch can be freeing. It's not yet time to ditch the smartphone, but Apple makes a more convincing case for a standalone smartwatch than any other company has so far.

We do obviously need to talk about the Apple Watch Series 4. The new smartwatch from Apple comes in 40mm and 44mm case sizes, offering a bigger display but will still work with straps that work with the Series 3. New features include an ECG monitor that unlocks the ability for serious heart health monitoring and it'll still come in GPS and LTE models.

Read our Apple Watch Series 3 review in full
$329, apple.com | Amazon
The best smartwatch for fitness tracking
Fitbit Ionic

Fitbit Ionic: Key specs
OS: Fitbit OSDisplay: LCD (348 x 250)Size: 38mm widthBattery: 5 daysWater resistance: 50mHeart rate: YesConnectivity: GPS, BluetoothWorks with: iOS, Android, Windows 10 MobilePros: Solid sports tracking | Guided workoutsCons: Buggy software | Too many TBC features
Feature check: GPS, heart rate monitor, onboard music, dedicated sports modes, Fitbit Pay.

With the Ionic, Fitbit finally delivered us its first smartwatch, but perhaps more importantly to some, its best fitness tracker too. Running, biking, swimming, weight lifting - the Ionic has algorithms for tracking a range of different workouts, and in our testing it's proven to be impressively versatile.

Fitbit says the Ionic's GPS is better than anything else on the market, and we have to say it performed admirably in testing, while the four-plus days of battery life mean you won't be taking it off your wrist as much as any of the smartwatches above.

The Ionic doesn't have the option of a cellular connection, however, so you won't get the standalone functionality you get with the Apple Watch Series 3 or the Samsung Gear S3 for instance. As to whether this is a bad thing or not, it depends if you class LTE as a feature or an excess.

Overall, some blemishes aside, the Ionic is a decent smartwatch that Fitbit fans and fitness trackers will really appreciate. Fitbit knows fitness, and it's not half-assing this that's for sure.

Read our Fitbit Ionic review in full
$299.99, fitbit.com | Amazon
The best smartwatch for less than $200
Fitbit Versa

Fitbit Versa: Key specs
OS: Fitbit VersaDisplay: LCDSize: 34mm diameterBattery: 4+ daysWater resistance: 50MHeart rate: YesConnectivity: Wi-Fi, BluetoothWorks with: iOS, AndroidPros: Attractive design | AffordableCons: No GPS | HR inconsistent
Feature check: Waterproof, heart rate monitor, sleep tracking, Fitbit Pay, notifications, App store, women's health tracking, connectedGPS (with smartphone).

The Fitbit Versa is the company's second smartwatch and along with a change in design direction, crucially it's available at a more affordable price than the Ionic.

The Fitbit Blaze replacement looks more Pebble than the first Fitbit smartwatch and comes in a host of different finishes and with a big collection of bands to mix up the look.

It promises all of the same fitness and sports tracking features as the Ionic although the big omission is the lack of GPS. If you want to track runs and rides, you'll need to have your smartphone with you.

Fitbit OS 2.0 brings a new-look UI that offers more insights into your daily data and quick reply support for messages for Android phone users (iOS support coming at a later date). You can still download apps and a whole lot of watch faces, pay from your wrist using Fitbit Pay and tap into Fitbit Coach, while new women's health tracking has also been introduced for the first time, which is also available for the Ionic too.

It's the best Fitbit smartwatch so far and if you are not bothered about the lack of built-in GPS, we think you're going to like it.

Read our Fitbit Versa review in full
$199.99, fitbit.com | Amazon
The best Wear smartwatch
LG Watch Sport

LG Watch Sport: Key specs
OS: Android Wear 2.0Display: OLED (480 x 480)Size: 46mmBattery: 430mAh, 1.5 daysWater resistance: IP68Heart rate: YesConnectivity: GPS, NFC, Wi-Fi, BluetoothWorks with: Android, iOSPros: Super zippy | Fantastic displayCons: Smudge magnet | Chunky design
Feature check: GPS, LTE, NFC, Google Pay, heart rate monitor.

The flagship model for Android Wear 2.0 (now Wear) launched in early 2017 but, even now, still feels like the best Wear watch on balance. With GPS, LTE and NFC for Google Pay on board, the LG Watch Sport is more rounded than its sibling, the LG Watch Style.

Beyond outdoor workouts like running, it can keep track of reps in the gym, which is a surprising and welcome addition, and it'll track heart rate in all your activities. However, it's only water resistant to 1.5 metres for 30 mins, which makes it unsuitable for swimming.

It's also very bulky. 46mm wide might not sound like much, but then you have the depth, and there's a lot of it here. In fact, if we had to pick one criticism of the Watch Sport it's that it crams so much in, it does so to its detriment. The size will be too overbearing for many, and the LG Watch Style is worth a look, but the pay-off in size means that most of the great features of the Watch Sport have been discarded.

Finally, the screen really impresses with the 1.38-inch, 480 x 480 OLED display using its 348ppi to best the Apple Watch Series 3 and others.

Read our LG Watch Sport review
$349, lg.com | Amazon
The best Samsung smartwatch
Samsung Gear S3

Samsung Gear S3: Key specs
OS: TizenDisplay: Super AMOLED (360 x 360)Size: 46mmBattery: 380mAh, 4 daysWater resistance: IP68Heart rate: YesConnectivity: GPS, NFC, Wi-Fi, BluetoothWorks with: iOS, AndroidPros: Intuitive rotating bezel | Brilliant displayCons: Less sporty than Gear Sport | Less svelte than S2
Feature check: GPS, Samsung Pay, Tizen, heart rate monitor.

Until we finish up our review of the new Samsung Galaxy Watch, the Gear S3 is our pick of the best Samsung smartwatch to consider. Compatible with Android and iOS, the Gear S3 is an improvement on the Gear S2 in all ways but one: the design. Or at least we think so; you might disagree and prefer that bigger, bulkier look. While it might look more like a classic watch than the S2, it's also much bigger - 46mm wide.

However that larger body affords it a screen where Tizen can really shine, and a bigger battery, from which we've managed to squeeze an average of three days from - much better than anything in the Wear stable or from the Apple Watch.
Samsung treads between smartwatch and fitness tracker, also packing in a heart rate sensor along with that GPS and its much-improved Samsung Health software. There's the option of LTE too if you wish for an untethered connection, with a standalone speaker for taking calls on the watch.

It's not quite the ultimate fitness all-in-one thanks to a lack of proper waterproofing, which makes swimming out of the question (check out the newer Samsung Galaxy Watch or the Samsung Gear Sport if that's more you bag) and the poor app selection puts it behind its rivals in terms of versatility but strong individual style, the intuitive rotating bezel and great battery life mean it's keeping ahead of anything from Wear in our list currently.

Read our Samsung Gear S3 review
$299, samsung.com | Amazon
The best smartwatch for fashion
Michael Kors Sofie

As wearable tech matures, designer collaborations are popping up everywhere. Tech firms have realized that they might not have the credentials to make the kind of products people want to show off on night out, and fashion and watch companies can skip years of R&D and focus testing.

From Swarovski, Fossil and everyone in between, smartwatches are moving away from horrid shrunken phones and look more like the stylish watches they need to have appeal. Top designers can push the boundaries even further. While there's a lot out of fashion smartwatches out there, we do have our fave.

Michael Kors Access Sofie: Key specs
OS: Android Wear 2.0Display: AMOLED (454 x 454)Size: 47mmBattery: 370mAh, 1 dayWater resistance: IP67Heart rate: NoConnectivity: Wi-FiWorks with: Android, iOSPros: Beautifully designed | MK customisationsCons: No Google Pay | Expensive
Feature check: Works with iOS and Android, MK customised displays, IP67 water resistance.

The Bradshaw and Dylan watches just missed the mark but the Access Sofie is more fashion-conscious. There's no denying that the Sofie wants to stand out, and fans of a more "dressy" or bigger watches will probably find it a better fit than those who like to keep their wrist wear understated.
One of the most immediately noticeable improvements is that the flat tyre, a blemish on last year's designs, is gone, with a nice 1.39-inch, 454 x 454 pixel AMOLED display.
Latest Wear smartwatch reviews
There's often criticism for smartwatches lacking a heart rate monitor or GPS, but unless you're someone who runs with their expensive stainless steel watch on the regular, we don't see it as a problem.
However the lack of NFC, and therefore Google Pay, is a definite black mark. Thankfully, that is being addressed with the upcoming Michael Kors Access Runway Wear watch that does bring Pay along with built-in GPS, waterproofing and heart rate monitoring.
If Michael Kors just isn't your speed, the unisex Skagen Falster is a close runner-up in the fashion category, as is the women's Kate Spade New York Scallop. Also worth a look is the new, slimmer Tag Heuer Modular 41. All of these are great looking Wear smartwatches.

Read our Michael Kors Access Sofie review
$349.99, fossil.com | Amazon
The best smartwatch for multi-sports
Garmin Forerunner 645 Music

Garmin Forerunner 645 Music: Key specs
OS: Garmin OSDisplay: LCD (240 x 240)Size: 43mmBattery: 7 daysWater resistance: 50mHeart rate: YesConnectivity: GPS, BluetoothWorks with: iOS and AndroidPros: Excellent sports modes | 7 day battery life Cons: Lack of apps | Computer-only music transfer
Feature check: Works with iOS and Android, GPS/GLONASS, heart rate monitor, dedicated sports modes including swimming, Garmin Pay, music storage, Deezer/iHeartRadio playlist syncing.

Garmin has been putting out go-to smartwatches for sports lovers for a while now. Running, cycling, swimming, golf - Garmin has had us well and truly covered. Despite the Forerunner name, the 645 Music is more in the mould of the Vivoactive 3 Music. It's got a similar look and also brings the music this time. This helps make the Garmin more of a smartwatch rival to the Apple Watch, Samsung Gear or Fitbit Ionic than before.

While you're not getting Spotify or Apple Music here, you are getting enough storage for 500 songs with a process that's fairly easy. You just boot up Garmin Express, select the Music tab and choose which of your own music you want to port over. If you do want to sync over playlists from a streaming service, your only options are iHeartRadio and Deezer.

That same attractive stainless steel design is here. The 240 x 240 pixel display at the heart of the body is by no means the brightest or vibrant you'll find, but crucially delivers strong visibility in most workout conditions whether you're sweating it out indoors or outside. However, there is no touchscreen or touchpad here, you'll have to resort to pressing some buttons - that could be a dealbreaker for some, but we're sure it won't be a massive one for most.

As far as the number of sports available to track: while it's more of the same, there are some notable exclusions - like golf tracking and open water swimming (pool swimming is a there though). Heart rate monitoring is decent if not class-leading, and it won't keep you waiting around for a GPS signal. There's also all the stress tracking goodies from Garmin's fitness trackers, too. As multi-sport smartwatches go, this is the best in our eyes, and builds on all the good work Garmin did with its previous iterations.

Read our Garmin Forerunner 645 Music review
$499, garmin.com | Amazon
The best hybrid smartwatch
Garmin Vivomove HR

Garmin Vivomove HR: Key specs
OS: Garmin OSDisplay: OLED (128 x 64)Size: 43mmBattery: Up to 2 weeksWater resistance: Swim proofHeart rate: YesConnectivity: BluetoothWorks with: iOS and AndroidPros: Classic timepiece design | Discreet displayCons: No GPS | Basic notifications
Feature check: Works with iOS and Android, Heart rate monitor, run tracking, notification support, two week battery life.

If you want a fantastic blend of design and smarts, then the Vivomove is your best bet - it's our choice for the best hybrid smartwatch you can buy right now.

The Vivomove HR offers watch designs for both men and women, adding a discreet display that only appears when you tap on the watch face. It's also waterproof up to 50 metres so you can take it for a dip too.

On that nicely disguised display you'll be able to see fitness tracking data, check in on your heart rate readings, view your smartphone notifications and even check on your stress levels. It's essentially the Garmin Vivosport fitness tracker minus the built-in GPS in a much sleeker and stylish body.

Battery life is two weeks in watch mode and five days when you're taking full advantage of the smartwatch features. On the whole, it's a winner - quite literally: it picked up the best hybrid watch award at the 2017 Wareable Tech Awards.

Read our Garmin Vivomove HR review
$199, garmin.com | Amazon
New smartwatches incoming...

Yes, more full fat and hybrid smartwatches are on the way and here's a taster of what to look forward to and what we have confirmed is dropping in 2018.

The big one is the Samsung Galaxy Watch, successor to the Gear S3, which is available in men and women-friendly models bringing 4G connectivity, up to seven days battery life and more. Don't worry, our review is imminent.

On the Wear front, there is a lot. We've got (wait for it) the Fossil Q Venture and Explorist HR, the new Diesel On Full Guard 2.5, the feature-packed Falster 2 and the Casio Pro Trek WSD-F30 review.
So there's plenty to look forward to, and you can bet there'll be plenty more announcements before the end of the year.