Wear OS’s chief problem, as we see it, is that it relies too much on input from swipes, taps, and other finger gestures. On a largish screen, such as on our top pick, this is less of a problem, but on smaller devices, trying to hit just the right button on the screen is like playing a very small version of Duck Hunt. The Apple Watch, by comparison, makes most of its buttons screen-wide rounded rectangles, which are easier to hit. On newer watches with three buttons, Wear OS also doesn’t utilize the physical controls beyond the home display (watch face), where they serve as shortcuts to apps or a list of apps.
They include a heart rate monitor, pedometer and altimeter to track steps taken and stairs climbed and often a GPS chip to record your distance covered. They will sync with your smartphone to give you a suite of tools to monitor your exercise progress. Many of them will offer notifications of incoming phone calls, text and email alerts as well. But they are designed with fitness tracking in mind. If you are happy using your smartphone for your day to day messaging, calendar, apps and music, a fitness tracker will suffice.
If fitness is your top priority, the Apple Watch Series 1 has a good number of shortcomings compared with a dedicated fitness tracker. It doesn’t have onboard GPS, so you’ll need to carry your iPhone to accurately track outdoor activities, like running or cycling, and it’s not waterproof enough for swimming. And unlike a dedicated fitness tracker, the Apple Watch can’t automatically detect and track workouts—you have to manually start it—though this feature is coming with new Watch software this fall. And Apple’s built-in Activity app doesn’t provide much detail, so if you want to dig into your fitness data, or access sleep tracking at all, you have to download third-party apps.
Several of them also now support wireless charging which is hugely valuable as you avoid adding yet another cable and cradle to your dresser. Wireless charging pads are on the market that will charge your compatible iPhone and watch at the same time, and Apple is set to release its own official charging pad dubbed AirPower. Wireless charging is also available for Samsung smartphones and smartwatches.
We loved Samsung’s characteristic bezel navigation. Instead of having to swipe your finger across the touchscreen repeatedly, all you have to do is gently twist the bezel. It’s a much smoother way of scrolling through your list and it just feels more natural. The are other side buttons which lie almost flush with the side of the watch, making it difficult for them to catch on sleeves.
On-Screen Workouts/ Connected GPS/ Bluetooth/ Smartphone Notifications/ 4 Day Battery Life/ Heart Rate Tracking/ 15 Exercise Modes/ SmartTrack/ All-Day Activity/ Female Health/ Sleep Tracking And Stages/ Cardio Fitness Level/ 3-Axis Accelerometer And Gyroscope/ Optical Heart Rate Monitor/ Color LCD Touchscreen Display/ Water Resistant To 50 Meters/ Black And Black Aluminum Finish
16GB Capacity/ Supports Voice And Data Over LTE And UMTS/ Built-In GPS And GLONASS/ Dual-Core Processor/ W2 Chip/ Barometric Altimeter/ Heart Rate Sensor/ Accelerometer And Gyroscope/ Water Resistant 50 Meters/ Ion-X Strengthened Glass/ Ceramic Back/ Wi-Fi (802.11b/g/n 2.4GHz)/ Bluetooth 4.2/ Up To 18 Hours Of Battery Life/ WatchOS 4/ Band Fits 140-210mm Wrists/ Space Gray Aluminum Case With Anthracite/Black Nike Sport Band Finish
In 1998, Steve Mann invented, designed, and built the world's first Linux wristwatch, which he presented at IEEE ISSCC2000 on 7 February 2000, where he was named "the father of wearable computing". See also Linux Journal, where Mann's Linux wristwatch appeared on the cover and was the feature article of LJ Issue 75. Seiko launched the Ruputer in Japan - a wristwatch computer with a 3.6 MHz processor. It was not very successful, since instead of a touchscreen it used a joystick-like device to input characters (much like high scores in arcade games), and the small screen with a resolution at 102x64 in 4 greyscales made it hard to read large amounts of text. Outside of Japan, this watch was distributed as the Matsucom onHand PC. Despite the rather low demand, the Matsucom onHand PC was distributed until 2006, making it a smartwatch with a rather long life cycle. Ruputer and onHand PC applications are 100% compatible. This watch is sometimes considered the first smartwatch since it was the first watch to offer graphics display (albeit monochrome) and many 3rd party applications (mostly homebrew).
The top smartwatches that debuted at the 2017 Consumer Electronics Show included the Casio WSD-F20, Misfit Wearables Vapor and the Garmin Fenix 5 series. Apple released on September 22, 2017 their Apple Watch Series 3 model which offers built in LTE cellular connectivity allowing phone calls, messaging and data without relying on a nearby smartphone connection. 
The Charge 3's screen has 40-percent more active space than the Charge 2 has, and it makes for a better touchscreen overall. From the watch face, swipe from top to bottom to reveal the notification drawer; from bottom to top to see the daily dashboard; and side to side to see available apps. Transitions between screen pages are smooth, and stick-figure animations in apps like the Exercise app move with ease.
There's now a heart rate monitor, as the name suggests, for tracking beats throughout the day and during exercise, a GPS monitor to keep up with your workouts and an NFC chip to enable Google Pay. Add to that the ability to take this underwater up to 50 metres, all on the top of the refreshed Wear OS, and it all rounds out as a very complete smartwatch experience.