Samsung Galaxy Watch 4 Review – The Watch4 is the best Wear OS smartwatch in a world of mediocre smartwatches

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Samsung Galaxy Watch4 Review Rating


The Samsung Galaxy Watch 4 is the best Wear OS watch I have used to date, though I have not been particularly impressed with all those before it. Battery life was good enough for me, I have probably just accepted that smartwatches will always have poor batteries compared to sports watches like Garmin. General fitness and health tracking seem to be superb. My main criticisms would be that I really don't like having functionality limited to certain users and the insistence of all the Samsung apps makes things feel a little fragmented. Body Composition was also basically useless for me.

  • Overall - 85%


  • Better battery than most Wear OS watches – 24+ hours is easily achievable, 2 days light usage
  • GPS and heart rate accuracy appear to be well above average
  • Excellent depth of health and fitness features
  • Optical HRM doesn't seem to flash up very often (when I am trying to sleep)
  • Excellent build quality and overall aesthetics
  • Price about right


  • ECG/Blood Pressure functionality limited to Samsung phones
  • You have to install several Samsung apps on your phone to get full functionality
  • Body Composition is extremely inaccurate (for me)

The Samsung Galaxy Watch4 was announced last month and is probably one of the most important smartwatch launches in years.

Samsung has teamed up with Google and will launch all their future smartwatches based on the Wear OS platform, ditching their own Tizen OS.

With Samsung being such a large player in the industry, this will have a massive effect on the market. Furthermore, the new watch uses their own Samsung Exynos W920, which will put pressure on Qualcomm to make sure its chipsets are competitive.

Lastly, as part of the Google collaboration, this is the first watch to use Wear OS 3, which claims to bring all sorts of benefits, including battery improvements. Samsung, being Samsung, have, however, skinned the OS and renamed it One UI Watch 3.0.

So is this the first great Wear OS watch, or have I got hyped up over nothing?

Design & Build Quality

As I bought this to review myself, I opted for the more affordable 44mm Samsung Galaxy Watch 4 rather than the Classic. The Classic will no doubt look better, but it is £100 more, and I am very happy with the build quality and aesthetic of the Galaxy Watch 4.

The overall build quality doesn't feel quite as plasticy as other smartwatches I have tried, the aluminium shell gives it a proper watch feel. In my opinion, it is not as nice as the Huawei Watch 3, but I prefer it to the Suunto 7.

I opted for the light grey strap with a silver casing, I think it looks a bit more interesting and attractive than the boring black. If you have very thin wrists, you may find that the 44mm watch strap is too big for you. I am cursed with dainty 17cm wrists in circumference, and I use the tightest setting. It fits comfortably at this setting, but for fitness, you often want things a bit tighter.

Samsung Bio Sensor

On the rear of the watch, you have the new Samsung Bio Sensor, which is one of the things that convinced me to buy it. It doesn't just do heart rate but also SPO2, ECG, blood pressure and body composition.

The HR sensor is quite interesting because I have not seen it light up once, and it appears only to have one LED. This is quite a contrast to my Garmin, which has two bright LEDs which can be quite visible while you wear it. It can also be distracting in bed depending on the tightness of the watch and how you sleep.

Set-Up – Requires lots of Samsung apps

Even though this uses Wear OS, Samsung has done its best to keep you away from any Google apps. All the set-up process is done on Samsung apps, and you will need multiple Samsung apps for things to work fully. So far, I have installed:

  • Galaxy Wearable
  • Samsung Health
  • Samsung Health Monitor (not on Google Play, but you can sideload a modded version)
  • Samsung Pay

Beyond that, the set-up isn't much different to normal Wear OS devices, it is just different apps doing the same thing.

Wear OS 3 / One UI 3 Features and Apps

I am not 100% sure which aspects of the watch are Wear OS 3 and which bits are Samsung's changes with the One UI Watch 3.0. It would seem that Samsung has taken the Tizen UI and applied it to this new Wear OS watch.

I am not a huge fan of the menu interface, it is just icons that inform you what the app is. So it is not immediately obvious what is what, though I will no doubt get used to what icon does what. It does look prettier than the current Wear OS menu, but I probably prefer the Huawei interpretation of this idea which allows you to zoom in and out.

With this being based on Wear OS, it has considerably more apps than previous Samsung watches, and much more again when you compare to the Huawei Watch 3. So if there is any functionality that is not native to the watch, you can easily add it.

Samsung Bixby, not Google Assistant

I am not a huge voice assistant user at the best of times, but many people will be disappointed to realise you are limited to Samsung Bixby, which is just an inferior product. It has been reported that Samsung is working with Google to bring Assistant to the platform.

Samsung Exynos W920 Performance

There is no objective way to test the chipset performance on a smartwatch that I am aware of. I don't think there are benchmarking apps.

So my opinion on the Samsung Exynos W920 performance is highly subjective.

In general, it is good with nothing to complain about. All the watch features work without issues. It does feel like scrolling, and general interface doesn't feel quite as responsive as the Huawei Watch 3. However, when scrolling long lists on the Huawei, I did experience some jitteriness, which I haven't noticed here.

Loading up apps does seem to be quicker than the Suunto 7. With the Suunto, there is a small delay between the app loading, while the Samsung seems to be instant. The Suunto also seems much slower when scrolling apps from the Play Store.

Outdoor Fitness / GPS Accuracy / Strava Export

At first, I thought this lacked proper export functions with the exception of the GPX file. However, the setting is hidden away in the Samsung Health settings, and I had overlooked the cog icon you needed to access them.

I have read some reports that Samsung doesn't sync properly to Strava, and the distances are off. This was not the case for me, the only annoying issue was the slow sync speed and no option to manually sync your data.

With this being a Wear OS watch, you can, of course, install the Strava app. While this is a good option, I like the data that the Samsung fitness app tracks.

GPS accuracy looked about as good as you can get. I only used two devices for my activities, so can't guarantee which one is more accurate, but on at least one point of my 4-mile run, the Garmin strays off course more than the Samsung.

On my long run, again, both devices tracked almost identically, with the Samsung appearing to drift off a small amount during one small bit of my run. In the end, there was just a 0.08mile difference or 0.4% between the two, and that could have been human error.

Optical Heart Rate Accuracy During Exercise

Like all wrist-based heart rate monitoring, the Samsung suffers from some peaks and troughs in the readings, but it seems to be better than average.

On my long run, Samsung recorded a peak of 172bpm while the Polar Verity Sense strap for my Garmin recorded 168 bpm. The average heart rate was identical.

Once I got things syncing to Strava, I was able to compare a couple of shorter runs more accurately.

On a 4-mile run with negative splits, the Samsung looks like it tracked my Garmin almost perfectly. There are a couple of bits towards the end where it strayed, but this was 1 or 2 bpm. Both devices had the same max HR of 180bpm. For some reason, the Samsung Health app reports an average HR of 141bpm, but the exported activity is Strava shows 157bpm. Garmin shows 156 bpm, so I am not sure how Samsung Health came up with that number

Cadance & Other Running Metrics

I am quite impressed with the amount of data you can analyse from the Samsung Health app.

Cadance is pretty much standard, but it matches up with my Stryd footpod. You then get:

  • Asymmetry
  • Contact Time
  • Flight Time
  • Regularity
  • Verticle Oscillation
  • Stiffness

Admittedly I don't really know how to apply any of this information into any meaningful training strategy. If it does highlight any problems areas, at least it may give you some insight if you need to work on your form or deal with muscle imbalances.

You also get VO2 max, which has become quite common with fitness wearables.

Health Tracking

Similar to fitness, you get an extensive amount of health data. I love this, but others may find it overwhelming, it would be good if watches like this had an advanced/novice interface option.

Sleep tracks each phase, gives you a sleep score, actual sleep time, and sleep consistency. For the sleep score, you can then see a breakdown of each element, including how much you moved and how much physical or mental recovery you had.

You can also optionally enable snoring detection and SPO2 during the night. With both of these enabled, you could, in theory, detect issues such as sleep apnea.

Similar to Apple/Garmin/Fitbit, you can add friends and then start to do challenges. This seems to be limited to challenges against people rather than do X in this month like Garmin/Apple also have.

You then have a wide range of fitness programs which includes various strength and endurance workouts. There are also some basic 5K and 10K training plans.

Body Composition

The body composition tracking is extremely hit or miss. It seems to suffer from many of the issues that electrical impedance scales suffer from but are amplified due to the awkward process.

You need to manually do this test, and it requires you to place your two middle fingers on the two buttons of your watch without touching any skin. Getting a successful reading seems to be 1 in 4 at best. Then the measurements vary wildly day to day.

The first day I was 20% body fat, the 2nd day 16% and the 3rd day 23% and on the fourth day I was 25%! My Withings Body Cardio Scale are not particularily accurate either, they can swing from 12% to 16.5%, but they are normally quite consistent around 15/16% body fat. I would estimate myself to be about 16%. I know eyeballing body fat is pretty much impossible, but it seems extremely unlikely that I am 25% as this would put me as almost obese (according to most online sources).

Admittedly my testing has been somewhat limited but based on the wild variation between results and massive overestimations, I would suggest that most people use this functionality with caution. Some reviewers have stated more positive outcomes than myself. One possible issue I can think of is that my boney and hair wrists don't provide the ideal environment for this test to work.

The Samsung Galaxy Watch 4 review continues on page 2

Last update on 2022-06-19 / Affiliate links / Images from Amazon Product Advertising API

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