Our choice for a robust Android watch for athletes
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According to our smartwatch expert
The Samsung Galaxy Watch Ultra (2025) 4G Titanium Blue 47mm is an outdoor watch that you can achieve your workout goals and improve your performance with. You get extensive insight into both your physical and mental health. For example, you can get to know more about your sleep pattern and stress level. You also receive personal workout advice for running a marathon, for example. The watch is made of strong titanium and sapphire glass. This means the Watch Ultra can take a hit as well as withstand extreme cold and heights. Thanks to the built-in eSIM, you can call and text with this smartwatch even when you don't have your smartphone with you. You do need a separate 4G eSIM data plan for this. The storage is twice as large as that of its predecessor, so you can store even more music on the 64GB storage. With average use, the battery lasts 2 to 3 days.
This watch is recommended for a wrist circumference of 17 to 19cm.
Note: a charger isn't included. Want to charge the watch via a socket? Use the charger of your smartphone or order a separate charger.
Compatible with operating system | Android | |
Height | 47 mm | |
Recommended for wrist circumference | 17 - 19 cm | |
Quality of sports readings | Good | |
Quality of health readings | Excellent | |
Battery life in time mode | 80 hours | |
Type of heart rate measurement | ECG heart rate measurement, Optical heart rate measurement | |
Required iPhone model | No impact |
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The Samsung Galaxy Watch Ultra (2025) is a large smartwatch with a robust design. Its sturdy design means it can withstand a few knocks. It has many sports functions and provides comprehensive insights into my health and sleep. The watch is large and heavy, so it's less suitable for narrow wrists.
Robust and heavy watch The Galaxy Watch Ultra (2025) is made of titanium and feels sturdy. It's thick and heavy, and I can really feel it on my wrist. It took a few days to get used to it. I have a 17-centimeter wrist circumference, so the 47-millimeter watch is large. Therefore, the watch looks better on wider wrists. Large buttons on the sides are easy to use. The middle button is a dedicated button for quickly opening an app. The 2025 version is the same as the Ultra (2024) in terms of features and design, but you get twice the storage: 64 gigabytes. This allows you to store more routes and music, for example.
Easy-to-read screen made of durable sapphire crystal The Ultra (2025) screen is very bright and sharp. This makes it easy to read outdoors in bright sunlight. It has to be, as the watch is designed for the most extreme conditions. The screen is made of durable sapphire crystal, so it can easily withstand impacts.
Battery life of 3 to 4 days The watch is suitable for trail running and other outdoor sports, so I expected the battery life to be longer than 3 or 4 days. If I turn on the power-saving mode and don't exercise, the watch lasts about 4 days. On days when I exercise and with the power-saving mode off, the battery life is about 3 days.
Many sports profiles and personal guidance This smartwatch is suitable for avid athletes who enjoy trail running and triathlons, for example. I haven't done any of that with it, but I have run with it. I've just started working out again, so I could really use some guidance. Before I received a personalized schedule, I had to take a running test. The great thing about my schedule is that it offers a lot of variety. For example, I do interval training and endurance running each week. After each workout, I see how I did on the watch and receive tips. That's motivating.
Extensive insight into my sleep After a busy day or a workout, I find it important to get enough rest. The Watch Ultra gives me a lot of insight into my sleep and how I can improve it, so I feel fit during the day. I know, among other things, when and for how long I was in each sleep phase, and what my heart rate was. The watch combines this data and more to give me a sleep score. In addition to this score, I also receive tips for improvement. For example, I receive a notification in the evening with the ideal time to go to bed. Thanks to these insights, I'm much more aware of my sleep and I go to bed on time more often.
Evany. Smartwatch specialist.
21 July 2025
Automatically translated from Dutch
It is modest but can do a lot, it can make a PDF from the ECG that you can send via WhatsApp, it can recognize atrial fibrillation, it can also use a sleep monitor to see if your breathing is going well, really too much to mention.
Michel
30 July 2025
Automatically translated from Dutch
Beautiful watch, easily adjustable, and does a lot of things very well. It all feels good, responds smoothly, and looks great on your wrist. Unfortunately, compatibility with all Android devices isn't entirely true, because for the blood pressure and ECG functions, I immediately get an error message saying those features are only available with a Samsung Galaxy phone. Fortunately, I quickly discovered that my Pixel 9 Pro phone wasn't compatible with Samsung, so I immediately returned it to the store. What's the alternative then? An iPhone with an Apple Watch, or a Samsung Galaxy phone with a Samsung Watch. In either case, you have to embrace the manufacturer's entire ecosystem to fully enjoy it.
I'm still considering what to do; I might go full-swing for Samsung after all, but you can only spend your money once!
William
21 August 2025
Automatically translated from Dutch
Coolblue takes care of everything, from taking out an insurance to repairs
For almost all accidents
More coverage in case of damage than your standard warranty
No deductible
First, add your smartwatch to your shopping cart. On the next page, choose one of the Protection Plans below. You always have a 30-day return window and pay no deductible in case of damage or theft.
2-year Protection Plan
40,99
one-time2-year Protection Plan with theft cover
44,99
one-timeProtection Plan - Monthly cancelable
5,71
per monthProtection Plan with theft cover - Monthly cancelable
5,89
per month
If you purchase the Samsung Galaxy Watch Ultra (2025) 4G Titanium Blue 47mm between 13 October 2025 and 9 November 2025, you can claim a Cloudpillo Original from Samsung. You can register your promotional product for the Samsung promotion until 9 January 2026. Go to the promotional Terms and Conditions (PDF) for more information. Note: only products purchased within the promotional period can participate in the promotion.
Product number | 966448 | |
Manufacturer code | SM-L705FZB2EUB | |
Brand | Samsung | |
Warranty | 2 years | |
Processing of your defect | Via Coolblue | |
Old product returned for free |
Compatible with operating system | Android | |
Required iPhone model | No impact | |
Required Android version smartphone | Android 11.0 or higher | |
Operating system | Wear OS | |
Year introduced | 2025 |
Watch case color | Blue | |
Watch case material | Titanium | |
Watch case shape | Round | |
Height | 47 mm | |
Width | 47,4 mm | |
Depth | 12 mm | |
Weight | 94 g | |
Size watch case | Large | |
Recommended for wrist circumference | 17 - 19 cm | |
Total storage capacity | 64 GB | |
Shockproof |
Watch strap material | Silicone | |
Watch strap color | Blue | |
Closure type | Buckle | |
Interchangeable watch strap | ||
Compatibility watch strap | Product specific |
Screen type | AMOLED | |
Always-on display | ||
Data display | Digital | |
Touchscreen | ||
Color screen | ||
Adjustable watch face | ||
Type of glass | Sapphire |
Battery life in time mode | 80 hours | |
Battery life in sports mode | 48 hours | |
Battery/battery capacity | 0,59 Ah | |
Energy source solar power | ||
Wireless charging |
Internet connection options | 4G and WiFi | |
Bluetooth | ||
ANT+ | ||
Independent music player | ||
Music controls | ||
Built-in microphone | ||
Built-in speakers | ||
Spoken directions | ||
Call options | Answer phone calls and call via smartwatch | |
Smartphone notifications | Receive messages, Send messages | |
Smart reply | ||
App installation possible | ||
Camera operation | ||
NFC | ||
Contactless payment | ||
Contactless payment system | Google Pay | |
Country contactless payment | The Netherlands |
Pedometer | ||
Measures distance | ||
Speedometer | ||
Calorie counter | ||
Measures stairs climbed |
Heart rate measurement | ||
Heart rate zones | ||
Type of heart rate measurement | ECG heart rate measurement, Optical heart rate measurement | |
Heart rate measurement under water |
Quality of health readings | Excellent | |
Skin temperature sensor | ||
Oximeter | ||
Blood pressure monitor | ||
EDA sensor | ||
Sleep score | ||
Measure REM sleep | ||
Average heart rate during sleep | ||
Measure recovery during sleep | ||
Menstrual cycle tracking | ||
Pregnancy monitoring |
Quality of sports readings | Good | |
Recommended for sports | Biking, Fitness, Hiking, Mountaineering, Outdoor, Running, Swimming, Water sports, Winter sports | |
Adjust sport profiles | ||
Manual training programs | ||
Save personal records | ||
Measure fitness age | ||
Recovery advice | ||
Interval training | ||
VO2 max measurement | ||
Automatic pausing | ||
Measures minutes of intensive training | ||
Measures average speed during activity | ||
Race prognosis | ||
Measures step distance | ||
Measure running cadence | ||
Measures swimming distance | ||
Measures swimming speed | ||
Swimming lap counter | ||
Connection to fitness machines possible | ||
ATM score | 10 |
Built-in GPS receiver | ||
Global satellite navigation system | GLONASS, GPS, Galileo | |
GPS application | Navigation |
Compass | ||
Altimeter | ||
Accelerometer | ||
Thermometer |
Fall detection | ||
Alarm function | ||
Geofencing |
