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Garmin Forerunner 645
Garmin Vivofit 4
See Top Ranked Smart Watches

Garmin Forerunner 645 vs Garmin Vivofit 4

Analysis:

The Garmin Forerunner 645 is an example of a great Smart Watch at its $270 budget.

In the case of the $68 Garmin Vivofit 4, however, we weren't able to find enough data to come to any reliable conclusions. If you're considering buying a Smart Watch in the $65 range, we encourage you to take a look at some other options.

The Garmin Forerunner 645 was loved by reviewers at Wirecutter (NYTimes), a highly trusted source that performs reliable in-depth testing. It did great in its "The Best Running Gear" roundup where it was named its "Top Pick", which, in itself, makes it a product worth considering.

As for our analysis of the Garmin Vivofit 4 - it's considered to be a great product by two reliable sources that do their own hands-on testing - it earned the "Best pedometer for battery life" award from Expert Reviews and "Best Compact Tracker" from Android Central, which is no small feat.

When we thoroughly analyzed their review scores, we learned that all of the sources that tested both Smart Watches, including Tom's Guide, preferred the Garmin Forerunner 645 over the Garmin Vivofit 4.

We also took a look at which sources they managed to impress the most. The Garmin Forerunner 645 was liked best by Tom's Guide, which gave it a score of 8, while the Garmin Vivofit 4 got its highest, 8, score from Runnerclick.

Lastly, we averaged out all of the reviews scores that we could find on these two products and compared them to other Smart Watches on the market. We learned that both of them performed far better than most of their competitors - the overall review average earned by Smart Watches being 7.2 out of 10, whereas the Garmin Forerunner 645 and Garmin Vivofit 4 managed averages of 8.0 and 7.7 points, respectively.

Due to the difference in their prices, however, it's important to keep in mind that a direct Garmin Forerunner 645 vs. Garmin Vivofit 4 comparison might not be entirely fair - some sources don't take value for money into account when assigning their scores and therefore have a tendency to rate more premium products better.

Comparison of expert ratings
Highly Recommended
Recommended
Mentioned
Not Mentioned
Wirecutter (NYTimes)
Tom's Guide
Expert Reviews
Android Central
Techradar
Android Authority
Runnerclick
T3
Digitaltrends
Lifewire
Tech. Specs Comparison
Garmin Forerunner 645
$226
Garmin Vivofit 4
$68
Cellular
No
-
GPS
Yes
No
NFC
Yes
-
Operating System
Garmin Watch OS
-
Higher than average expert review score
7.3
Overall Avg. for Smart Watches
8.0
Avg. Review Score
Score
Has average expert review score
7.3
Overall Avg. for Smart Watches
7.7
Avg. Review Score
Score
Recommended by trusted experts
Wirecutter (NYTimes)
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Best Overall
in “The Best Running Gear” 
Last updated: 1 Apr 2020
Wirecutter (NYTimes)
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Best Overall
in “The Best GPS Running Watch” 
Last updated: 26 Feb 2020
Wirecutter (NYTimes)
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
The best watch for the serious runner or triathlete
in “The Best Smartwatches, Fitness Trackers, and Running Watches” 
Last updated: 9 Mar 2020
Recommended by trusted experts
Tom's Guide
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Ranked #8 out of 9
in “Best cheap fitness trackers in 2020” 
Last updated: 15 Jun 2020
Expert Reviews
Trusted Source
Depth of
analysis
Yes
In-house
Testing
Best pedometer for battery life
in “Best pedometer 2020: Track your steps with the best pedometers around” 
Last updated: 3 days ago
Android Central
Trusted Source
Depth of
analysis
Yes
In-house
Testing
Best Compact Tracker
in “Best Cheap Fitness Trackers in 2020” 
Last updated: 10 Mar 2020
Techradar
Trusted Source
Depth of
analysis
Yes
In-house
Testing
Ranked #5 out of 10
in “The best cheap fitness trackers 2020: the top affordable sport bands to keep you fit” 
Last updated: 10 Mar 2020
Techradar
Trusted Source
Depth of
analysis
Yes
In-house
Testing
Ranked #10 out of 10
in “Best fitness tracker 2020: the top 10 activity bands on the planet” 
Last updated: 4 May 2020
Wirecutter (NYTimes)
Highly Trusted Source
Depth of
analysis
Yes
In-house
Testing
Mentioned
in “The Best Fitness Trackers” 
Last updated: 8 May 2020

Key things to consider when buying Smart Watch

Our super simple Buying Guide

A smartwatch is a wearable computer in the form of a wristwatch. Smartwatches bring notifications, apps, voice control, fitness tracking, and more to your wrist. Although they vary in their features and designs, smartwatches generally help increase productivity and keep track of fitness and health data, like heart rate and sleep tracking.

With exceptions of no-name brands and cheap knockoffs, smartwatches range from $100 on the low end and up to $2500 for the most premium devices. The price goes up significantly when looking at products made of luxury materials, or ones with a very specific use case. Most people will be satisfied with getting a mid-range smartwatch. An option that costs around $200 will typically offer all of the essential tracking and productivity features but may be missing some more premium ones, like cellular connectivity, NFC, or onboard music storage. For $500 you can get a fully-fledged smartwatch that will track a wide array of activities, have a large number of extra features, and will be made of high-quality materials. The high-end of the market is reserved for smartwatches that are aimed at fashion-conscious people who want their smartwatch to have premium looks, without offering any additional functionality over the more reasonably priced options.

The smartwatch market is evolving quickly, with products getting discontinued after two or three years and new flagships being released annually.

A few key players in the industry:

  • Apple enjoys the biggest share in the market and dominates it with their universally lauded, iPhone exclusive Apple Watch smartwatches. They feature great build quality, run on their well-developed wearOS, flawlessly integrate with the iOS ecosystem, and have a wide selection of applications.

  • Samsung mainly produces smartwatches for Android smartphones, but its wearables are also compatible with iPhones and Windows devices. The company's smartwatches run on Tizen OS, which has all of the essentials but lacks some popular apps.

  • Fitbit is known for its great lineup of fitness-focused smartwatches that come at a relatively low price. Fitbit built their own OS that's compatible with all types of smartphones.

  • Garmin offers smartwatches with advanced tracking functions and rugged build quality. The company is primarily focused on outdoor enthusiasts.

  • Xiaomi, in partnership with Huami, also produces good products and focuses on the budget end of the smartwatch market.

These are the most important specs to consider when buying a smartwatch:

  • iOS - This is arguably the most polished operating system for wearables currently available and Apple keeps constantly improving it by pushing regular updates to the OS. It only works properly when their Apple Watch is linked to an iPhone; Apple states that phones from other manufacturers aren't supported.

    WatchOS is the wearable operating system that's currently exclusively used by the Apple Watch. It's smooth, battery-friendly, has a large library of apps, and is well-connected to the iOS ecosystem.

  • Tizen - Tizen is a great OS choice for smartwatches because it's very battery-friendly and smooth to use. However, the current lack of apps and the inferior Bixby virtual assistant are considerable drawbacks to an otherwise good OS.

    Tizen is a custom operating system developed by Samsung. It's known for its versatility - it's used on smartphones, smartwatches, wearables, in-car entertainment systems, TVs, and other smart-home appliances.

  • Cellular - A cellular connection on a smartwatch allows you to do anything that requires data without having your phone nearby. That means that the watch can independently make calls, text, receive notifications, stream music, and more. However, it negatively affects battery life and usually comes at a premium - models that support a cellular connection are typically more expensive and incur extra costs in the form of monthly network operator fees.

  • GPS - Information from a smartwatch's GPS sensor is typically used to provide important workout metrics such as the distance covered, speed, and pace. There may be some small inaccuracies, but the error variation across different devices is typically insignificant for the majority of users.

    The Global Positioning System uses signals from satellites to determine the exact location using triangulation. GPS functionality in smartwatches is essential for certain sports, like cycling, running, golf, and swimming.

  • NFC - NFC in smartwatches lets you perform contactless payments, replacing credit or debit cards. The technology is convenient, fast, and adds versatility to the smartwatch.

    Near Field Communication (NFC) is a type of wireless data transfer that detects and enables other nearby devices to communicate with each other without internet connectivity.

    While you may struggle to find NFC functionality on older smartwatches, the majority of newer models come with an NFC chip.

  • Fitbit OS - This operating system was purpose-built for a more fitness-focused experience. It's optimized to be battery friendly and features an app store that's mainly populated by health and fitness applications. Fitbit doesn't have its own voice assistant and currently uses Amazon's Alexa.
    Fitbit OS is the operating system used by Fitbit smartwatches and fitness trackers.

  • Android - Wear OS is compatible with a wide selection of devices and can easily be synced with iPhones and Android smartphones alike. However, there are certain features that won't work with iPhones, such as iMessages, replying to messages through third-party apps like WhatsApp or Slack, and full integration with calendar and emails. Wear OS has a clean and simple user interface, Google Assistant integration, and a good amount of apps available on Google's Play Store. However, the OS can sometimes feel laggy and buggy; some apps can take a few seconds just to launch. Another major drawback of WearOS is its poor battery life - its competitors are delivering multiple days of battery life, whereas most Wear OS devices still need to be charged every night.

    Originally named Android Wear, Wear OS is Google’s Android-based operating system specifically designed for wearables and smartwatches. Because of its open platform, it's used by a variety of smartwatch manufacturers.

Find the best product and price, effortlessly.

Discover deals on products actually worth buyingthe best products

We do the research. You save the money.
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