Rated 4.8 by 300,000+ customers

Just arrived today and I couldn’t wait to open the box. Adjusted the band to a perfect fit and have been “playing” with all the personalization options all day. Very nice looking and it feels like a solid quality watch. Very impressive indeed!

This is my best watch ever. the sound quality of speaker in bluetooth mode is very crisp! i love this because the battery lasts unlike the apple watch . I can’t get over but I really love this watch

Jeff
Germany

This watch,almost,does everything i need apart from NFCpayments,oh well.
It's rugged,well made,stylish,and really practical,everything i need.

Absolutely love it. (9/10).

I ditched my Garmin for this and I have 0 regrets! The quality is amazing and the customer support was fast to respond to all of my questions. Also the battery life is amazing!

Ok so I was sceptical about this watch but I ordered it mainly because I didn’t want to keep charging my apple watch daily as it’s a pain. I’m only giving it a 4 because even though I like the watch the battery does not last 21 days I charge my watch every 6 days.

Been testing North 511's watches since their Kickstarter days, and the Viper XL is their best work yet. It's like they took every single complaint from our early feedback sessions and crushed them. Screen visibility was always decent, but now it's perfect in any lighting. The new titanium finish is way more scratch-resistant than the original samples. Even the app got a complete overhaul - remember those sync issues we used to have? Ancient history. Really cool seeing a company actually use tester feedback instead of just pushing out minor updates.

My watch came within 7 days an i was not disappointed, took me nothing to set everything up geared towards me and what I wanted.
With all the different options for the watch face and different options for everything else it is the perfect watch to help keep you up medically and styling too.
I love it, it's the perfect watch for me, thank you North 511.

Got this as a present and I LOVE IT!
(I'm here to get another charger for leaving it at my office)

As a freelance photographer, my schedule is completely unpredictable, but the Nova Plus adapts perfectly to my irregular lifestyle. Whether I'm shooting a sunrise wedding or editing photos until midnight, it tracks my activity levels accurately. The stress monitoring feature alerts me when I've been hunched over my computer too long, reminding me to stretch and move around my studio space.

Honestly didn't expect to be this impressed. I've gone through a few smartwatches over the past couple years and most of them just don't hold up. The Cobra XL has been on my wrist every single day since I got it and I haven't had one complaint. The case feels genuinely solid, the screen is bright enough to see in direct sunlight, and the watch faces are insane — I keep switching between them just because there are so many good ones. Battery life is around 12-13 days for me with the display settings I run, which is way better than the Samsung I had before. Ordered it on a Thursday, got the shipping notification by Friday evening, and it showed up at my door 5 days later. Super happy with this one.

Wore this out on a Friday night and it held up beautifully. The golden poppy face almost looks like it glows in low lighting — got so many compliments at the bar. It doesn't look like a smartwatch at all in that environment, it just looks like a statement piece. Easy to check the time discreetly and see if I missed any messages. This watch goes everywhere with me now.

Seems pretty good value for the money. Feels quite durable, and it does the job of a Samsung watch, fit bit and more all in one. Can even track my blood pressure and stress levels.

The vibration alerts are great. I don’t always hear my phone when I’m out and about, but the subtle vibration on my wrist keeps me from missing any important notifications. It’s a small feature that’s made a big difference.

my best inexpensive watch ever! i’ve used it on a 10miler run and still battery is great.!!! its not like applewatch that runs out not even 12 hours. the microphone is so great !!!

This smartwatch is next level! I'm super impressed with all the features and it's indeed strong AF! I really like mine so thank you North511!

I have been using the Luna Pro for a while now, and I am really impressed The AMOLED display is bright and sharp, making it easy to see in any lighting conditions The soft gold stainless steel bezel adds an elegant touch, and the ivory silicone band is lightweight and comfortable for all-day wear!

Former Apple fanboy here and never thought I'd switch, but my brother wouldn't shut up about his Viper XL. Finally caved and now I get the hype. The screen is actually brighter than my Series 8, and I don't miss that fancy touch crown at all. Interface is snappy, notifications are clean, and the fitness tracking is surprisingly detailed. My old watch would've been toast after the abuse I've put this through. Plus I can finally go on weekend trips without packing a charger.

The Viper XS has become an essential part of my daily routine. I wasn’t expecting to fall in love with it, but it’s quickly become my favorite accessory. The gold finish is gorgeous and elevates any outfit, whether I’m in gym clothes or dressed up for an evening out. I mainly use it to track my steps, calories, and heart rate, and it does all of that perfectly. So far I love it 🥰

Stella for me and the Nexus pro for my husband for our anniversary. We are both extremely happy with the functions and the look of both models. I also got some different straps to change the look from time to time.

I purchased the Nova Plus after my doctor suggested monitoring my heart rate during exercise following some irregular readings. The continuous heart rate monitoring gives me confidence during my spin classes and weekend tennis matches. The data helps me understand my body's responses to different activities, and I can easily share the information with my cardiologist during appointments for better health management.

Been camping and doing van life style trips for the past year and I needed a watch that could keep up. Most of the cheap stuff I've tried falls apart or dies in two days. The Cobra XL has been with me through rain, mud, two weeks without charging, and it still looks brand new. I run the topographic map face when I'm out in the field and it actually looks incredible on the display — almost feels like a real instrument you'd carry on a serious expedition. The battery genuinely surprises me every time. I was expecting to charge it every week like my old one but I'm getting closer to two weeks easily. Great product, would buy again without hesitation.

This watch transitions so well from day to evening. I wore it to a dinner out over the weekend and it looked perfectly elegant — the dark face with rose gold floral details catches the light beautifully. During the day it's practical and functional, at night it feels like real jewelry. The screen brightness adjusts automatically which is a nice touch. Really impressed with how versatile it is.

Absolutely amazing watch for such a good price. Highly recommend !!!

Expand, and keep doing the good work guys.

I needed a durable watch that could keep up with my physically demanding job, and this one has been perfect. I’m constantly banging it against equipment, and it’s handled everything with ease.

I wanted a watch that I could take hiking in the wilderness and this has fit the bill well. I’ve only had it for a couple of weeks but I’ve taken out to battle test it a few times and it’s performed well. It’s bulky, but the trade off is it seems incredibly durable and ready to withstand whatever nature can throw at it.

I’ve used this watch in the pool and on the trails, and the water-resistant feature holds up perfectly. Whether I’m swimming laps or getting caught in a rainstorm while hiking, this watch has no issues handling the wet conditions. It’s become a reliable companion for all my water-based activities.

The battery lasted the entire trip without needing a charge, and I love that it tracks my steps and heart rate accurately even in extreme conditions. The display is bright even under direct sunlight, and the watch is lightweight, so it never felt bulky.

Lucky enough to be one of the beta testers for the Viper XL since I was a day-one Nexus Pro user. Let me tell you, they took all our feedback and knocked it out of the park. They kept the tank-like durability but made it way more comfortable for all-day wear. The screen is next level - I can actually read notifications without that awkward wrist twist. What impressed me most is how they improved the heart rate sensor - used to lose tracking during intense workouts, now it stays locked even during my most brutal CrossFit sessions. I thought the sleep tracking on the Pro was good, but this is on another level - shows you exactly when you hit deep sleep and what disturbed you. Plus the app got a complete overhaul - clean, fast, and hasn't crashed once. Props to the dev team for listening to the community. Seriously, if you liked the Nexus Pro, you'll love this upgrade.

I wasn’t sure if I needed a smartwatch, but after using the Viper XS, I can’t imagine going without it. The gold band is gorgeous and makes it look like a high-end accessory rather than just a fitness tracker. I love how it tracks everything I need—steps, calories, and heart rate—while still being comfortable enough to wear all day and night. The sleep tracking feature has been such a lifesaver for me. It showed me how inconsistent my sleep was, and now I’ve been able to adjust my habits and wake up feeling so much more rested. It’s durable, stylish, and functional—a combination that’s hard to find in smartwatches these days.

Battery is amazing, I charge mine once every 2 weeks and I use it almost everyday when running and doing pilates. The health functions are also a big plus and they are surprisingly accurate.
I will try get Luna Pro model now for having a round shape watch too.

The Nova Plus seamlessly integrates with all my other health apps and provides comprehensive wellness insights daily. The heart rate variability data has helped me understand which activities truly help me recover from stressful work periods. The customizable watch faces mean I can keep it professional during client meetings while still having access to my fitness data.

I'm a bit of a watch nerd and usually stick to mechanical pieces but I decided to try a smartwatch to track my sleep and activity properly. The Cobra XL caught my eye because the case design is just different from anything else out there at this price point — it has real heft to it and doesn't look like a toy on your wrist. The watch faces are incredibly detailed, I've been running the moon phase and NVG tactical face and people keep asking me what it is when they see it. Sleep tracking, step count, heart rate — everything works consistently and doesn't drain the battery. Got the confirmation email and tracking number pretty quickly after ordering and delivery was around 5 days. I'm genuinely impressed.

Charging my watch is genuinely something I forget to do because the battery lasts SO long. Saw 100% on the face today and I honestly couldn't remember when I last charged it. The poppy flower face is my absolute favorite watch face, I never change it. Perfect for relaxing at home and just living your life without worrying about a dead watch. Love it.

Saw the ad on Facebook and decided to give it a try (mainly to see how good a 100 bucks smartwatch can be). I was surprised to see that the battery life is amazing, functions and overall quality are way over my expectations.
Easy to connect to my android smartphone via the app that is free to use.
I leave here a photo with my nexus pro on the blood pressure readings but I constantly use also the sleep tracker, alarm, calls and step counter.
Thank you for the watch and to the customers support representative that replied to my email in the same day!

I’ve worn this watch through rainstorms and even while washing my car. It’s completely waterproof, and I haven’t noticed any issues at all. The design is sleek, and it’s the toughest watch I’ve ever had.

This is great!

I didn’t think I’d use the sedentary reminder as much as I do, but it’s been great for keeping me active throughout the day. I work at a desk all day, and this little reminder nudges me to get up and move around, which I appreciate. It’s a small feature, but it’s made a big impact on my routine.

The battery life is INSANE—I’ve gone over 3 weeks without charging, and it’s still going strong. The step tracking, heart rate monitor, and oxygen level sensor are all accurate and have helped me optimize my training.

Real talk about the Viper XL from someone who's destroyed three "premium" smartwatches last year. Survived my klutzy nature - dropped it on concrete, banged it against my kayak, even had it on while fixing my bike chain. The titanium case looks way more expensive than what I paid. Heart rate monitoring is spot-on during my trail runs, and the sleep tracking data actually helped me fix my caffeine-fueled disaster of a sleep schedule. Water resistance holds up in classic Seattle rain and weekend swims. For this price? No brainer.

I’ve always struggled to find a smartwatch that balances style and functionality, but the Viper XS has nailed it. The gold finish is absolutely stunning and pairs beautifully with all my outfits. I was skeptical about the fitness tracking features at first, but they’ve been so accurate and helpful. The heart rate monitor gives me peace of mind during workouts, and the step tracker helps keep me active throughout the day. The sleep tracking has also been incredibly insightful—I’ve learned so much about my sleeping habits and made adjustments that have improved my energy levels. Plus, the battery life is a dream come true. It feels like I never need to charge it.

Good quality and watch as i have most of the functions I need. The app is free to install and use, setup takes 10 minutes at most and it looks really nice. However, the shipping can be improved, got mine in Sydney - Australia in 11 days...

As someone who travels frequently for work, the Nova Plus has been incredibly reliable across different time zones and climates. The GPS tracking works perfectly whether I'm running in humid Miami or hiking in dry Colorado mountains. The long battery life means I don't have to pack yet another charger in my already overstuffed travel bag.

Got this because I wanted something that could handle the gym and look decent enough when I'm not training. Wore it through back day, leg day, and a few outdoor runs and it didn't skip a beat. The heart rate sensor is accurate enough for training purposes and the screen stays readable even when you're sweating. What I didn't expect was how good it looks just wearing it around — the design is aggressive but in a good way, fits my style perfectly. Battery has been lasting me 10-11 days even with workouts tracked daily. Shipping was fast, got a tracking number quickly, was at my door in under a week. Solid purchase.

Lazy Sunday morning and my watch is fully charged and looking gorgeous on my wrist. I love the poppy face so much — it's the first thing I look at every morning. The battery sitting at 100% after sleeping in it all night really tells you everything. Soft strap, beautiful design, zero hassle. This watch has genuinely made my mornings a little prettier.

Awesome device at a fair price! All functions are working great and I'm getting realistically 14-15 days of battery life (amazing compared to other smartwatches that I had to charge every 1-2 days).
After I placed my order I got the confirmation email with the invoice and few hours later when the package was dispatched I got the tracking number. Delivery to the US took around 6 days in total.
Really happy with my north511 watch 👍👍

This is by far the most comfortable smartwatch I’ve owned. The band is soft and breathable, and I never have to take it off unless I’m charging. It fits perfectly into my active lifestyle.

Wow! Super impressed with the enduranceX! Been using it for a few months now and I really like it. It's indeed super strong and has a lot of great features

What I love most about this smartwatch is how seamlessly it syncs with my phone. I get my messages, calls, and social media notifications without having to constantly check my phone. It’s a lifesaver when I’m in meetings or working out and don’t want to pull out my phone. Super convenient and easy to manage.

I have tiny wrists, and most smartwatches look huge on me, but the Luna Pro is the perfect size! It’s elegant, doesn’t feel cheap, and people keep asking me if it’s a designer brand.

It tracks steps, heart rate, and sleep well, and I like the hydration reminders—they actually help me drink more water. The only thing missing is a built-in GPS, but I always have my phone on me, so it’s not a deal-breaker.

Been through a rollercoaster of testing this bad boy for 29 days - desert hiking in Arizona, weightlifting at Gold's, and crashing on my mountain bike twice. Still sitting at 34% battery which is straight-up wizardry. The titanium build laughed off every hit, and the heart rate tracking stays locked even when I'm gasping through burpees. Sleep tracking called me out on my 4AM gaming sessions - turns out they're not great for recovery, who knew? Screen's always clear whether I'm blinding myself checking notifications at 3AM or squinting under Texas sun. Waterproof enough to handle my shower playlist's entire duration. At this price point? Absolute theft.

The Viper XS is everything I’ve ever wanted in a smartwatch. From the moment I unboxed it, I could tell it was high-quality. It feels luxurious without being over the top. I’ve worn it to casual brunches, formal events, and during my workouts, and it fits into every part of my life seamlessly. 💗

El servicio de atención al cliente merece un reconocimiento; respondieron a mi pregunta sobre el envío en cuestión de horas. ¡El reloj en sí también es genial! El monitor de estrés funciona de maravilla, reviso mi frecuencia cardíaca con frecuencia y recibo todas mis llamadas y mensajes directamente en mi muñeca.

The Nova Plus has helped me maintain my fitness goals while working from home this past year. The sedentary reminders encourage me to take walking breaks between video calls, and the step counter motivates me to reach my daily movement targets. The sleep tracking revealed that my late night Netflix habits were seriously impacting my rest quality and morning productivity.

Wasn't sure about ordering online but the photos looked legit and the price was right so I went for it. Zero regrets. The watch arrived in solid packaging, it was fully charged out of the box, and setup took maybe five minutes total. The case is bigger than I expected but I actually love that — it wears bold and that's kind of the point. Been wearing it every day for almost two months, still on the same daily habits and I'm getting 11-12 days of battery. Had one question about the watch faces and the customer service response was fast and helpful. This thing is worth every dollar.

The beige strap version is stunning — so different from the typical white or black you see on most smartwatches. It's warm, feminine, and goes with everything I wear. The poppy face with the tan strap combo is literally my favorite thing in my accessory collection right now. Paired with my cross necklace it looks so put together. The watch also does everything I need — messages, health tracking, battery that actually lasts.

Love the watch faces and the functions of the nexus pro.
Delivery was lightning fast (around 5 days to my doorstep) and communication with the north511 team was smooth.
Satisfied with my smartwatch.

I’m really impressed with the step counter accuracy. I’ve used other watches that seemed off, but this one nails it every time. It keeps me motivated to hit my daily goal without feeling like I have to babysit the watch.

Everything is perfect with my purchase. I really like the smartwatch a lot and the customer support team was great. The shipping was a bit delayed but I was able to get my watch in time

I didn’t expect to love this watch as much as I do. It has all the features I wanted, and the design is sleek.

I love that it has tons of watch face options, and I can even use my own photos as a background. The band is super comfortable, and it looks so nice that I wear it everywhere. If you’re looking for a fitness tracker that’s also stylish, GET THIS!

Never thought I'd write a detailed product review but the Viper XL deserves it. First off, 35 days of continuous use and still rocking 31% battery - that's actual insanity compared to my graveyard of dead smartwatches. Build quality punches way above its price point - the titanium feels premium and tough. Put it through the wringer at the gym, picked up heavy boxes while moving, even wore it playing basketball. Screen still pristine, no scratches anywhere. Love how the display handles different lighting - always readable whether you're under fluorescent gym lights or bright sunshine. The fitness tracking is shockingly good for the price. Heart rate monitoring stays consistent even during intense cardio, and it actually recognizes different exercises automatically.

This watch is perfect for my lifestyle. It’s durable enough for intense workouts yet stylish enough to wear out for dinner. The interchangeable straps are such a nice touch—I’ve been switching between the sporty band and a dressier one depending on the occasion.

Bought 1 for my sister's b-day and when I saw how nice it is, got one for myself too!

I've tried three different smartwatches over the years, but the Nova Plus is the first one that actually feels comfortable enough to wear all day long. The band material doesn't cause any skin irritation even during humid summer workouts in Texas. The workout detection is surprisingly accurate for my varied exercise routine including kickboxing, pilates, and weekend hiking adventures.

Was out in the field doing some work and needed a reliable watch to track time, weather, compass direction — all that stuff. Grabbed the Cobra XL after seeing it pop up and I'm glad I did. The tactical faces on this watch are next level, the one with the compass rose, range indicator, and NVG readout looks and works great out in the open. It's been on my wrist through heat and cold and dirt without any issues. Battery is excellent, I've been running it close to two weeks between charges consistently. Tracking number came through fast and delivery to Texas was right around a week. Will be buying more from this brand.

I've tried a few smartwatches over the years and most of them look too techy and bulky for everyday wear. This one is different. It's sleek, it's feminine, it actually complements an outfit rather than clashing with it. The AMOLED screen has beautiful colors and the poppy flower face is my favorite — I get so many comments on it. Notifications work great, sleep tracking is accurate, and the battery is genuinely impressive. This is now my daily driver and I can't imagine going back.