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Amazfit Bip
Amazfit Cor
Two lower cost watches aimed at fitness and simplicity
Recently I had the opportunity to compare the Amazfit Bip and Cor smart watches from Huami. These are two watches aimed at fitness, simplicity, and great battery life.
Currently on Amazon the Bip comes in at $79.98 and the Cor at $49.99. When I first started looking at both of these watches I couldn't figure out exactly why the Bip cost more but there are some interesting differences, some of which account for the higher price for the Bip.
Extras in the box - Charging cradles (and nothing else)
Bip charging cradle 
Cor charging cradle
Both watches come with a charging cradle and nothing else in the box. The Bip's cradle seems to be a little nicer. When you snap the bit into it’s charging cradle, the band wraps around underneath which is different than most charging cradles I've seen and I kind of like it.
On the Cor you have a magnetic connector that you snap into place and it works really well. I didn’t have any problems with the orientation of the connector although it only snaps in one way. Note that neither watch comes with a wall charger.
Styling
The Bip is a traditional style square watch while the Cor is a band style watch
Both watches weigh 32 grams with the strap but the Bip for some reason feels lighter to me. The Bip is definitely more comfortable to wear in my opinion but if you like band style watches, you might have a different opinion. I will say that my girlfriend's wrists were just too small for the Core. The straps don't start flexing until farther out on your wrist and if you have very small wrists it simply doesn't work very well. Also the Cor is a bit thicker which is also one of the reasons I think the Bip is a little more comfortable to wear.
Buttons
As far as buttons go, the Cor has a soft capacitive button bar and that’s it. The Bip has a traditional single button on the right of the watch. These buttons on both watches are used to wake the watch. The physical button on the Bip can also be used to navigate back to previous screens when navigating the watches menus.
Unlocking screen for interaction
One difference between these two watches is that you can't interact with the screen with touches on the Bip until you unlock it with the button. On the Cor, it's unlocked right away as soon as you touch the screen or button bar.
Surrounding the watch face
One thing I was a little disappointed in on the Bip although not a huge deal, was that the display doesn't entirely fill the watch face. I think they could have stretched it out a little bit. They also snuck in their logo on the Bip where as on the Cor you don't have a logo on the watch face
Can’t change font size
Another feature I would have liked to have seen is the ability to change the font size. I prefer a larger font size. My eyes aren't as good as they used to be. Neither watch allows you to change the font size which is a little disappointing
You can choose watch faces on the Bip which are a little easier to read but some of the watch face elements on a number of watch faces are very small and difficult to read.
Always-on screen (Bip only)
One thing you'll notice on the Bip is the always-on screen which I really like. The Cor does not have that feature. You always have to turn it on or lift your wrist in order to start it which is similar to a lot of smart watches. I’d rather have the always-on like on the Bip as it seems closer to traditional mechanical watches.
Sunlight readability
In sunlight the Bip wins hands down for readability. I couldn't see the Cor in sunlight at all. The Bip was easily readable. The Cor uses an LCD display while the Bip uses a transflective display. The huge difference in readability in sunlight is practically a deal breaker for me. I would think it would be a deal-breaker for many that want to use either of these watches for outdoor fitness.
Extra watch faces
Both watches come with a number of watch faces that you can set and they also allow for downloading other watch faces although not many.
Only one watch connected to your phone at a time
You can only have one watch connected to your phone at a time. This is different than Android Wear or Wear OS. I have two Android Wear watches that I can connect to my phone at the same time and get notifications on both watches from the phone simultaneously.
12 hour vs 24 hour watch faces
One thing that I wasn't happy with on both watches is that they don't allow you to change the time from 24 hour (military) to 12 hour. If you like a watch face and it's showing 24 hour time, there's no way to change that watch face to show 12 hour time.
Turning off the watches
Another thing I found was that there was no way to turn off the Cor watch. For whatever reason, the settings on the Bip allow you to turn it off but that setting is not available on the Cor.
Fitness features, activities
One of the main reasons to get either of these watches is the fitness features. Both watches have very similar functionality as far as fitness goes. You can take your heart rate manually or by starting an activity.
On the Bip, there's outdoor running, treadmill, cycling, and walking. You can also look at your activity history right on the watch. In activity settings, you set alerts for heart rate, pace, and distance.
On the Cor it's very similar for your activities but there's only two activities listed, treadmill and exercise. When you start the activity it measures distance, frequency, time, and heart rate. To stop the activity, you long press the touch bar.
After starting a activity on the Bip, it shows you a few different measurements: distance, time, heartbeat, steps, and stride length. You can also see your current altitude and how many feet you've gained and lost in altitude. Altitude is not available on the Cor.
Water Resistance
The Cor can withstand pressure up to 50 meters of water depth. You can swim in pools with it, take a shower with it but they don't recommend using it when you're diving or in a sauna.
The Bip is IP68 certified which means 1.5 meters for 30 minutes maximum and they don't recommend using it in the shower or swimming with it
Notifications
Notifications on both watches seem to be handled the same way. I didn't see any differences at all except that the text has to wrap sooner on the Cor versus the Bip. Sometimes that wrapping makes it more difficult to read. But the font size on the Bip is a bit small making it a little difficult to read for notifications also.
You can have up to 10 notifications on the watches at one time. After that it will start deleting old notifications. You simply swipe up and down to read notifications and then you can swipe right to delete an individual notification. You swipe all the way to the bottom to clear all notifications on the watch. The notifications are not dismissed on your phone.
Weather
The weather feature is the same on both watches. It shows the high temperature, low temperature, and current temperature.
Alarms (both watches)
Alarms can only be created, edited, and deleted on the Mi fit app. On the watch you can only enable or disable an existing alarm.
Timer feature
The timer feature has both a countdown and stopwatch timer.
Compass (Bip only)
The Bip has a compass. This feature is only on the Bip and not on the Cor. It must be calibrated before first use. And you must do this with a good GPS signal. It would not calibrate inside my house. Once you calibrate it, you should be able to see the North longitude, East latitude, altitude, and pressure.
Configure long press of side button (Bip only)
The Bip allows you to set what a long press of the side button does. You can configure it to start an activity or turn off the watch. This feature is unavailable on the Cor.
Brightness
There are five different brightness settings but there is no auto brightness on either watch. I usually kept both watches at full brightness because with the incredible battery life that they have, it doesn't make much of a difference. I suppose in complete darkness, full brightness might end up being too bright.
Find your phone feature
On both watches, you can click a menu item to find your phone. When you click it, a fairly loud alarm goes off on your phone.
Battery life
I didn't test battery life out but the battery life was looking amazing compared to other smart watches I've owned (like the Moto 360 and Verizon Wear24). After two weeks, both watches were still around 50%. The company reports 30 days battery life and I believe it.
Conclusion
Overall, both the Amazfit Cor and Bip smart watches can suit your needs depending on what you're looking for. You can definitely save some money over much costlier smart watches. The Cor has a slightly nicer display (much worse in sunlight, though). Battery on both watches is just amazing if you're used to charging your Android Wear or Apple Watch every night. The Bip seemed more comfortable and had a few extra features for fitness activities.
User manuals
Bip user manual
Cor user manual