Garmin 645 Music vs. Garmin VivoActive 4

645 Music
VivoActive 4
 Garmin645 MusicBuy NowGarminVivoActive 4Buy Now

Basic Info

Suggested Price$450$349

Activity & Fitness

Cycling (Bicycling)


Duration7 days8 days


Windows Phone




Resolution240 x 240260 x 260
Size1.2 inches1.3ionches


Audio Speaker


Barometer or Altimeter
Ultraviolet Sensor
Water Resistance5 ATM5 ATM




Operating SystemWear OS

Comparing VivoActive 4 and 645 Music

When looking for the perfect smartwatch, it’s essential to compare the features and functionalities of the top devices in the market. Today, we’ll take an in-depth look at two popular smartwatches from Garmin: the 645 Music and VivoActive 4. The right smartwatch can make a huge difference in tracking daily activities and helping users achieve their fitness goals.

As a leading brand in smartwatches, fitness trackers, and wearables, Garmin is known for its top-quality products and innovative designs. Established in 1989, the company has been at the forefront of GPS technology and wearable devices, making it a trusted choice for consumers worldwide.

In this article, we’ll compare the design, build, features, user interface, and price of the Garmin 645 Music and VivoActive 4 to help you make an informed decision.

Design and Build

Garmin 645 Music

The Garmin 645 Music features a sleek design, stainless steel bezel, and chemically-strengthened glass. Measuring 42.5 x 42.5 x 13.5 mm and weighing 42.2 grams, it is lightweight and comfortable to wear throughout the day. The watch has a 1.2-inch display with a screen resolution of 240 x 240 pixels and MIP (Memory-In-Pixel) technology for better visibility under direct sunlight.

Garmin VivoActive 4

On the other hand, the Garmin VivoActive 4 has a slightly larger build with a stainless steel casing and Corning Gorilla Glass 3. The smartwatch measures 45.1 x 45.1 x 12.8 mm and weighs 50.5 grams, offering ample screen space without being too bulky. The VivoActive 4 boasts a 1.3-inch display with a screen resolution of 260 x 260 pixels, also utilizing the MIP technology for improved visibility in bright conditions.

Comparison of Design and Build Quality

While the Garmin 645 Music offers a lighter design, the VivoActive 4 provides a larger screen and enhanced durability due to the Corning Gorilla Glass 3. Both watches have stainless steel bezels and similar water resistance ratings of 5 ATM, making them suitable for swimming and showering. The choice between the two ultimately depends on individual preferences for size, weight, and screen dimensions.

Features and Functionality

Garmin 645 Music

Operating on Garmin’s proprietary system, the 645 Music offers a range of features, including GPS tracking, built-in music storage, and heart rate monitoring. It also provides sleep, steps, distance, and calories tracking, along with cycling and swim tracking. The watch’s battery life lasts up to 7 days and offers compatibility with both Android and iOS smartphones.

Garmin VivoActive 4

Powered by Wear OS, the VivoActive 4 caters to more advanced tracking capabilities like Pulse Ox measurements (oxygen saturation), in addition to the features offered by the 645 Music. With a slightly better battery life of up to 8 days, the VivoActive 4 ensures convenience for users on-the-go. Like its counterpart, this smartwatch is also compatible with Android and iOS devices.

Comparison of Features and Performance

Though both smartwatches offer similar tracking features and smartphone compatibility, the VivoActive 4 boasts extra functionalities like Pulse Ox measurements and superior battery life. The choice between these two smartwatches depends on the users' fitness goals and specific tracking requirements, making both devices excellent options for various needs.

User Interface and User Experience

Garmin 645 Music

With a user-friendly touchscreen interface, the Garmin 645 Music allows effortless navigation through different menus, apps, and customization options. Though the device may not support Mac and Windows computer compatibility, it ensures seamless syncing with Android and iOS smartphones for notifications and app management.

Garmin VivoActive 4

The VivoActive 4 offers a comparable touchscreen interface with easy-to-navigate apps and customizable options. Also compatible with Android and iOS smartphones, this smartwatch maintains consistent communication and management through various devices.

Comparison of User Interface and User Experience

Both smartwatches deliver a similar and user-friendly touchscreen interface for navigation and customization. The primary difference comes down to the VivoActive 4 operating on Wear OS, which may offer a broader range of apps and a different user experience in comparison to the Garmin 645 Music’s proprietary system.

Price and Value

Garmin 645 Music

Priced at $450, the Garmin 645 Music stands as a top-tier option for users seeking advanced fitness tracking capabilities and music storage, ensuring convenience and functionality in a single device.

Garmin VivoActive 4

At $349, the Garmin VivoActive 4 provides advanced tracking features, including Pulse Ox measurements, and improved battery life, making it a compelling and cost-effective alternative to the 645 Music.

Comparison of Price and Value

Considering the price-points and features, both the Garmin 645 Music and VivoActive 4 cater to different preferences and budgets. The VivoActive 4 may be more appealing due to its lower price, advanced tracking capabilities, and superior battery life. However, for those who value built-in music storage, the 645 Music can still be a desirable choice.


In summary, both the Garmin 645 Music and VivoActive 4 are excellent smartwatches with distinct features and capabilities. The lighter design and music storage options of the 645 Music cater to specific user preferences, while the VivoActive 4 offers additional fitness tracking features at a lower price. Ultimately, the choice depends on individual needs, fitness goals, and budget considerations.

Frequently Asked Questions

Do both smartwatches support music storage and playback?

The Garmin 645 Music has built-in music storage, while the VivoActive 4 can store and play music via compatible apps.

Is the Pulse Ox (oxygen saturation) measurement available on both watches?

No, only the Garmin VivoActive 4 offers Pulse Ox measurement.

Are there any differences in water resistance between the two watches?

Both the Garmin 645 Music and VivoActive 4 have a 5 ATM water resistance rating, making them suitable for swimming and showering.

Do these smartwatches offer GPS tracking?

Yes, both the Garmin 645 Music and VivoActive 4 come with built-in GPS tracking capabilities.

Are they compatible with third-party apps?

Both the 645 Music and VivoActive 4 are compatible with various third-party apps, with the VivoActive 4 running on Wear OS, potentially offering a broader range of app options.

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