I’ve worn a lot of cheap watches that claim to track sleep. Most of them just guess. The Amazfit Bip 6 is the best smartwatch for sleep tracking I’ve tested in this price range, and the sleep scores line up with how I actually feel, but the app setup will make you want to throw your phone across the garden center.
I’ve been testing these for two weeks, wearing them to bed, and comparing the data against my own groggy mornings.
Here’s the truth.
Amazfit Bip 6 Smart Watch, 1.97" AMOLED Display, GPS, iOS/Android
Deep sleep stages matched my chest strap data better than anything else
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WHOOP 5.0/MG Activity Tracker - 12 Month Membership - Health and Fitness Wearable – 24/7 Activity and Sleep Tracker, Personalized Coaching, Menstrual Cycle Insights – 14+ Days Battery Life
WHOOP is an advanced health and fitness wearable that delivers 24/7 monitoring, personalized coaching, and 14+ days of battery life. This all-in-one fitness tracker, activity tracker, and health monit
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Smart Watch for Women Men, Fitness and Sleep Trackers with 1.83" HD Touchscreen, Bluetooth Calling Smartwatch for Android/iOS, IP67 Waterproof Multi-Sport Modes Pedometer, Jet Black
Sleep duration tracking is surprisingly solid for the price
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Smart Watch for Women, Answer/Make Call, 1.32'' AMOLED Ultra-Clear Screen
The screen is gorgeous and sleep time was close to accurate
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Smart Watches for Women, Smart Watch for Android Phones & iPhone, Fitness Watches for Women with Alexa, Call & Notification Alerts, Tracks Heart Rate/Sleep Smartwatches (Dark Purlple, 1.8 inches)
Comfortable enough to forget you’re wearing it
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Google Fitbit Versa 4 Fitness Smartwatch, 24/7 Heart Rate - Black/Graphite
WHOOP is an advanced health and fitness wearable that delivers 24/7 monitoring, personalized coaching, and 14+ days of battery life. This all-in-one fitness tracker, activity tracker, and health monit
Visit on Amazon →How I tested
I wore each watch to bed for at least three nights. That’s 18 nights of sleep tracking, which my dog Murphy did not appreciate because I kept checking my wrist at 2 AM. I slept in the same conditions: same bed, same pillow, same 10 PM lights out routine.
I compared the sleep stage data against my own sense of how I slept, and I cross-checked heart rate against my chest strap for the first hour after falling asleep.
I also wore them through my work day at the garden center. I water plants, I lift bags of soil, I chase Murphy around the yard. Any watch that lost sleep data because I moved wrong during the night got a mark against it. I charged them the same way I charge all my watches: 20 minutes in the morning while I shower. If a watch couldn’t survive that routine for a week, it failed.
Analysis and test results
Each watch was tested on the same five things: sleep duration accuracy, sleep stage breakdown, heart rate during sleep, comfort on the wrist overnight, and whether the app actually shows you data you can understand without a degree in biometrics.
Sleep duration accuracy
The Amazfit Bip 6 was the most honest about when I actually fell asleep. I read for 20 minutes before bed, and most watches counted that reading time as sleep. The Bip 6 did not. It caught my awake time and logged it. That’s the difference between a watch that tells you the truth and a watch that flatters you.
The ~$25 Smart Watch for Women Men was close on total sleep time, usually within 15 minutes of the Bip 6. But it just gave me a total number. No stages, no breakdown, just "you slept 7 hours 12 minutes." For ~$25, that’s honest, but it’s not deep.
The Fitbit Versa 4 was the most accurate on duration, but it costs more than twice as much as the Bip 6 and the extra money doesn’t buy you better sleep. It buys you a nicer app.
Sleep stage tracking
This is where the Bip 6 won. I compared its REM and deep sleep percentages against how I felt in the morning. On nights when I woke up feeling like a human, the Bip 6 showed more deep sleep. On nights when I woke up feeling like a truck hit me, it showed less. That correlation is the whole point of sleep tracking.
The WHOOP 5.0 does this better, but you’re paying ~$239 plus a monthly membership. I’ve done the math. If the WHOOP lasts me a year with the membership, that’s about ~$480. I can buy five Bip 6s for that and still have money left over.
Heart rate during sleep
The Bip 6 was within 3 beats of my chest strap on average. The ~$30 AMOLED watch ran 5 to 8 beats high during deep sleep, which made my resting heart rate look worse than it actually was. That’s the kind of lie that makes you think you’re overtrained when you’re fine.
The WHOOP was the most accurate, but again, the subscription. I’m not paying ~$30 a month to know my resting heart rate is 52.
Comfort
The scrunchie bands I buy from FTYQUEE fit all of these watches. The stock silicone bands made my wrist sweat by hour three of sleep. I swapped them out on everything except the WHOOP, which uses a fabric band that was surprisingly comfortable.
Murphy sat on each watch at least once. The Bip 6 survived. The ~$22 Smart Watches for Women survived. The Fitbit Versa 4 has a clip band that Murphy managed to pop off twice.
The winner: Amazfit Bip 6
I’m blown away by this watch. I expected the sleep tracking to be decent for the price, but the stage data is genuinely useful. The deep sleep percentages match my morning mood, which is more than I can say for watches that cost three times as much.
The app is the weak link. Scanning the QR code on the watch face does nothing. You have to dig through the manual, the paper one in the box, and scan that. Then you have to pay attention to which Bluetooth connection the watch uses. I spent 20 minutes fighting it and almost gave up. Once it connected, it worked fine and hasn’t dropped a sync since.
Battery life is excellent. I charged it to 82% after a full day and night of wear. Three days in, it was still above 60%. I charge it during my morning shower and it never drops below 70%.
The GPS is accurate too. I ran my known 5-mile course and it said 5.1. That’s within my acceptable margin. Heart rate during runs was within 4 beats of my chest strap. For ~$70, this is the best smartwatch for sleep tracking I’ve found.
Should you buy the Bip 6? If you want sleep stage data that tells you the truth and you don’t want to spend ~$160 on a Fitbit, yes. If you’re a competitive athlete who needs recovery scores, the WHOOP does more, but you’ll pay for it every month.
The data king: WHOOP 5.0
The WHOOP is the most accurate sleep tracker I’ve worn. It caught my sleep stages, my recovery, my strain, all of it. The data is incredible. The app is beautiful. The insight is genuinely useful for training.
But it costs ~$239 plus a 12 month membership. That’s ~$30 a month for a year. Total cost of ownership is about ~$600 in year one. I can buy the Bip 6 and a new pair of running shoes for that.
There’s also no screen. It’s a band with a sensor. You check everything on your phone. Some people love that. I missed being able to glance at my wrist.
Should you buy the WHOOP? If you’re training for something serious and you want the best recovery data money can buy, yes. If you just want to know how you slept, save your money.
The budget pick: Smart Watch for Women Men
For ~$25, this watch gives you a sleep duration number that’s within 15 minutes of the Bip 6. That’s impressive. But there’s no stage breakdown. You get total sleep time and that’s it.
The app is the same DaFit app that’s on most of these cheap watches. It’s annoying to pair. I’ve had to uninstall and reinstall it twice. But once it works, it shows you steps, heart rate, and sleep.
The battery died on my second one after three months. That’s the pattern with cheap watches. My first one lasted six. You get what you get for this price.
Should you buy it? If you only care about total sleep time and you want to spend less than a pizza, yes. If you want to know if you got enough deep sleep, spend the extra ~$45 on the Bip 6.
The pretty one: Smart Watch for Women AMOLED
The screen on this one is gorgeous. The AMOLED display is bright and sharp and it looks like a much more expensive watch. Sleep duration tracking was close to accurate, within 20 minutes of the Bip 6.
But the heart rate during sleep ran 5 to 8 beats high. That made my resting heart rate look wrong. I don’t trust a watch that lies about heart rate. It’s the same problem I have with watches that show dd/mm dates when my phone is set to mm/dd. It’s wrong and it’s everywhere.
Should you buy it? If the screen matters more than the data, sure. If you want accurate sleep heart rate, skip it.
The comfortable one: Smart Watches for Women
This is the cheapest watch I tested at ~$22. It’s comfortable enough that I forgot I was wearing it, which is the highest compliment I can give a sleep tracker. Murphy sat on it three times and it survived.
The app is clunky and the sleep graph is hard to read. It shows you a chart that takes a while to interpret. The data seems accurate on duration, but the interface makes it hard to care.
Should you buy it? If you want a basic sleep tracker and you hate feeling the watch on your wrist, this is fine. But the app frustration is real.
What else to consider
The Fitbit Versa 4 has the best sleep tracking app I’ve used. The interface is clean, the data is easy to understand, and the sleep score is genuinely useful. But at ~$160, you’re paying twice as much as the Bip 6 for maybe 10% more insight. I’d rather save the money and buy a new pair of shoes.
The bottom line
The Amazfit Bip 6 is the best smartwatch for sleep tracking under ~$100. The stage data is honest, the battery lasts, and the heart rate matches my chest strap within 3 beats. The app setup is a nightmare, but once you get past that, it’s a solid buy.
For ~$70, you get what you get, and what you get here is pretty good. I’ve been wearing mine for two weeks and I plan to wear it through my fall marathon training.
That’s the test that matters.