Amazfit GTS 4 : Full Scientific Review ( Form over Function… )

🟡 Twitter: @QuantifiedRob
* Affiliate (paid) links support the channel by earning me a commission on any sale, and it doesn't cost you any more! My opinions are completely my own, and this content is not sponsored.
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
👇 $30 off any new WHOOP membership, affiliate* (paid) link, supports the channel!👇
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
👇Amazon Affiliate* (paid) links. Supports the channel, doesn't cost you any more!👇
▬▬▬▬▬▬▬▬▬▬BEST WATCHES▬▬▬▬▬▬▬▬▬▬
($30 off any new WHOOP membership)

🔴 Oura Link: I recommend you search for a discount on reddit with the "Refer-A-Friend" program!

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
📸My Gear* (paid links, supports the channel and doesn’t cost you any more)📸
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

Timestamps:
00:00 Intro
01:27 Heart Rate Test 1: Spinning
06:12 Heart Rate Test 2: Running
07:08 Heart Rate Test 3: Cycling
09:45 Heart Rate Test 4: Weight Lifting
12:12 Heart Rate Test Conclusions
12:30 Sleep Stage Test 1: Sleep Stages
18:06 Sleep Stage Test 2: Overview
19:43 GPS Tracking Test
22:57 Conclusions & Recommendations

In this video, we will be using scientific and systematic methods to test and review the GTS4's capabilities when it comes to sports and health tracking. But before we dive into the testing, let me give you some context. I recently reviewed the Amazfit GTR4, but unfortunately, it didn't perform very well in our testing. However, the GTS4 is a lighter and smaller version of the GTS4, with a square screen instead of a round one. The lower weight and different fit of the GTS4 could actually improve its performance over the GTR4, so I am excited to put it to the test. To accurately evaluate the GTS4, we've collected data for 29 workouts, 11 nights of sleep, and 13 GPS tracks using the watch. We'll be comparing this data to reference devices to see how well the GTS4 performs. So, if you want to know whether the Amazfit GTS4 is the smartwatch for you, this video will help you make that decision. I'll be sharing all the data, insights, and analysis you need to make an informed decision.

After reviewing the GTS4 and also the GTR4 recently, I am honestly quite disappointed that both these amazing looking Amazfit devices perform so poorly when it comes to health and sports tracking. The screens and designs of these watches are really nice, but similar to the GTR4, the GTS4 also greatly disappoints when it comes to the measurements it takes. Overall, I would give the health and sports tracking of the Amazfit GTS4, 2 out of 5 stars. Maybe you don’t care about health metrics, but I suspect if this was the case, you wouldn’t have made it until the end of this video. I have gotten the best heart rate tracking on the wrist with Apple Watches, but these do require iPhones. If you want an overall good performing device that also tracks your health really well in addition to being a decent heart rate tracker, I would recommend the Whoop Strap.

Thanks Theresa Buerscher for largely editing the video!

[TheQuantifiedScientist]

🔵 Newsletter: www.robterhorst.com
🟡 Twitter: @QuantifiedRob
* Affiliate (paid) links support the channel by earning me a commission on any sale, and it doesn't cost you any more! My opinions are completely my own, and this content is not sponsored.
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
👇 $30 off any new WHOOP membership, affiliate* (paid) link, supports the channel!👇
($30 off any new WHOOP membership)
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
👇Amazon Affiliate* (paid) links. Supports the channel, doesn't cost you any more!👇
▬▬▬▬▬▬▬▬▬▬BEST WATCHES▬▬▬▬▬▬▬▬▬▬
🔴 Whoop Strap 4.0:
($30 off any new WHOOP membership)

🔴 200$/150$ discount*: + add code “TQS” for 200$/150$ total discount
🔴 Oura Link: I recommend you search for a discount on reddit with the "Refer-A-Friend" program!
🔴 Oura Link2: ouraring.sjv.io/rQ4L33 (affiliate link that supports the channel, but doesn't have a discount)

[hitemup]

"I don't like listing specs of watches, so let's get right to it" - That's awesome, performance is what ultimately matters. Great review and enjoy your videos.

[MotoGReviews]

As a PhD student in AI, I greatly appreciate your quantifiable approach to comparing smartwatches. May I suggest using correlation coefficient to compare the GPS signals to find out how correlated they are? Also, I would like if you could compare against the correlation coefficient value for GPS signals from a cellphone on your pocket. I think using it would give a quantifiable measure of agreement between bike trip tracks, which is what your channel is all about ;)

[AndruComedy]

Apple watch cant really do sleep tracking cuz you have to charge it every day (most ppl do at night). Amazfit 15 day life

[tarisaifrancismandishona]

The best smart watch analysis you can get in this world, i love your analysis, you have saved me from making poor buying decisions

[jucapini]

Hi, I'd love to know if recent updates improve the performance of thos and other watches. Something like 1 year update or something, that would also give us a better notion of how the manufacturers take care of sold watches

[tenjisaga]

great channel mate, loving the objective evidence-based reviews.. One thing that might enhance understandability might be the units of time along the x-axis. E.g., does 19:10, 19:20 = 7:10pm, 7:20pm? or 19m:10s, 19m:20s? Might seem obvious but I can't be sure... I presume the interval is 10s rather than 10m?

[domenicolatosa]

Amazing video! I'm an engineer and totally understand your point 😊

Can I ask which battery saving smartwatch setup have you used on the GTS4 used on these tests? In my experience with previous GTS models, that can influence the quality of measurements. Thank you 😊

[rashidm]

GTS 4 has received numerous firmware updates, claiming it increased HR detection quality, calorie calculation etc.
Could you, please, make an update to the review?

[elviselvis]

Hello. Have there been significant improvements on the gts4 in the measured values ​​(heartbeat, sleep recording etc.) since the last firmware update?

[maksimivanov]

Thank you! This precise analysis was exactly what I was looking for.

[blaineblasdell]

Looking forward to your review on the Amazfit TRex 3. A lot of different reviews out there. Curious to see if it really stacks up to what people are saying.

[svlagonda]

Excellent review. Love reviews that are supported by actual data.

[oldman]

i really appreciate the fact that you are also testing these smartwatches which appear on the first page of amazon when we search for Apple watch :D

[puwanatth]

Hi, I saw Amazfit Balance is out now, and it has different heart rate sensor,
I will be waiting your new video for that new watch, Thank you

[sanatmishra]

Man if you're going to recommend any alternatives, at least make those recommendations in the similar price range. Everyone knows apple watches are the most accurate, but most of us can't afford them that's why we're having to look at reviews like these

[РоманЛявин]

thanks for the review. I recently received the Zepp OS 3.5 update to this watch, which adds so many new features: power and running performance, maps, "automatic" GPS accuracy mode, also heart rate variability and readiness (level of recovery, physical and mental). Do you have any plans to do small tests after this update in terms of GPS accuracy, heart rate accuracy, sleep? Perhaps everything has changed there relative to the old version of Zepp OS 2.1. Thank you

[AndreiDinTheHouse]

I'm a bit surprised that the actual sleep detection isn't part of the sleep tracking test. Stage detection is definitely important, but for example Apple Watches just don't detect sleep outside of set sleep schedule, while things like GTS 3 (at least) do quite well to pick up the fact that I sleep whenever it happens.

[shooricus]

Hopefully Amazfit Balance will be better, they claim that new HR sensor is much more accurate.

[krollpeter]

Unfortunately, Apple watch is the only one that really lives up to claims. I am not going to buy an iPhone for that. I do not like the restrictive Apple environment, their price system, the "unrepairability", and their ways to oversimplify every product.
The Blood sugar measurement they may introduce into their product will be a hit, if it works same well.

I think that all smartwatches that have health monitoring functionality should conform to minimum standards. Otherwise, the vendor should say clearly it's for entertainment purposes, and not be allowed to prominently market health functions.