At the beginning of 2018, Garmin introduced the Forerunner 645 Music variant, which featured an integrated music playback system. The fact that it came with built-in storage for music was the feature that received the most attention, so that's what we'll focus on here. At the time that this event took place, the company had never experienced anything like it before. Since then, the capacity to play music has become an indispensable component of the feature set provided by Smartwatches belonging to the Forerunner and Fenix lines.

The Forerunner 745, which was introduced earlier this month, also comes with storage embedded within the device itself and should therefore not come as a surprise to anyone. This is in addition to the vast majority of other advancements that have been made in comparison to the 645.

If you're still utilizing an old piece of technology, you might wonder whether this is the ideal time to switch to a more recent version. The 645 has been withdrawn from Garmin's website, which is an indication that the firm intends to cease production of the watch within the next year or two at the very latest. It is improbable that an update in the form of 655 will take place now.

The 645 is presently being sold at significantly lower prices than its original suggested retail price (RSP). But will the money that you save be enough to justify it? In this article, we will discuss Forerunner 745 and 645, as well as compare and contrast the two models and explain the differences between them.

Additional Reading: Which is better: Fitbit Charge 5 or Samsung Galaxy Watch 4?

Comparing the 745 and 645 models of the Garmin Forerunner running watches

Both of these Smartwatches have a look that is remarkably similar to one another, which is reminiscent of more recent iterations of the Forerunner family of watches. The size is the primary aspect that separates it from other similar items.

The Forerunner 745 has more excellent dimensions than the other model, measuring 43.8 millimeters on each side and 13.3 millimeters in height. The measurements of the 645 are as follows: 42.3 x 42.3 x 12.2 mm. This is smaller than the 645. Having said that, neither of these goods is very large, and both are more compact than the 935/945 and the vast majority of the other items in the Fenix family of products.

Those with average size wrists should not experience any difficulties when using the 745. If you have narrower wrists, you could find that the 645's smaller size and lighter weight are more appealing to you than its larger size and heavier weight.

If you ignore the more obvious, surface-level differences in look, practically every other appearance feature is identical. One of these components, stainless steel, is used in the creation of the bezel that is affixed to the 645. This contributes to its overall design, which is noticeably more opulent than that of the bezel made of fiber-reinforced polymer that is featured on the 745.

Although one of the watches is substantially smaller than the other, Garmin has included the same sunlight-visible, transflective memory-in-pixel display in both watches. It is 3.1 centimetres (1.2 inches) long (240 x 240 pixels).

To reiterate, there is not much of a distinction to be made regarding the senses. The most noteworthy advancement that the 745 offers in comparison to the 645 are the SpO2 technology, which can determine the amount of oxygen in the blood. A gyroscope, barometric altimeter, thermometer, compass, accelerometer, and a sensor for detecting heart rate are all included in both.

Both of these gadgets include a receiver for the satellite navigation systems GPS, GLONASS, and GALILEO, as well as an NFC chip that enables users to make contactless payments. Given that there is an age difference of two years between the two of them, it really shouldn't come as a surprise. On the other hand, some of these things have inevitably been passed down to the most recent generation.

Moving on to the critical topic of battery life, we find that the 745 is superior to the 645 in spite of the fact that the 745 has a higher total number of sensors. Both watches have a battery life of around one week when operating in smartwatch mode, although the first watch's battery life is somewhat increased when the GPS is activated.

Additional Reading: Best Stress Monitor Apps for Apple Watch

Comparing the activity tracking and innovative features of the Garmin Forerunner 745 versus the 645 Music

These two Smartwatches are representative of the Forerunner brand's mid-range collection. This means that they give a little bit of everything and can be used to keep track of your runs, bike rides, and a range of other activities in addition to their primary purpose of monitoring your running and cycling activity. Because of this, it can also be deduced that they will be more than capable of performing the function of monitors for fitness and sleep.

Now that we've established that, shall we go right into the differences? Both models also include hardware and sensors that are equivalent to one another; however, the 745 has quite a few advancements that are dependent on software rather than hardware.

To get things started, the SpO2 sensor can monitor the amount of oxygen that is present in the blood. Readings can be taken at any time. However, they are typically done at night while the subject is sleeping. Readings can be taken at any time. On the other hand, readings can also be ordered whenever needed.

There are some additional features provided also. As can be seen, this includes the incorporation of the 745 of Body Battery, other detailed sleep statistics, 24/7 respiration measures, additional performance data (Training Load Focus, Training Effect Labels, and Heat and Altitude Acclimation), and alerts for an unhealthy heart rate (both high and low). You will not acquire any of these features if you purchase the 645.

The 745 also contains a function that provides recommendations for your New Daily Workout, and its recovery measures are dynamically changed in real-time based on how well you are resting. Both of these features are included as part of the package. Garmin has indicated that this feature will be incorporated into the 945, 245, and most recent Fenix watches; however, it will not be incorporated into devices that were created before.

In addition, there are workout programs based on yoga and pilates, additional outdoor recreation profiles and navigational capabilities, as well as additional features for cycling and swimming (which includes tracking heart rate underwater).

Additional Reading: HP vs. Lenovo Laptops

The 745 and the 645 are virtually identical in terms of the intelligent functionality they offer 

Although the 745 has a few additional features to offer in terms of monitoring sports and fitness, the 645 is still the superior option. Both have an NFC chip that allows for payments to be made without having to make physical touch. In addition, if you get the Music model of the 645, which is the more expensive option, you will receive storage that enables you to save up to 500 songs on the device at one time. There is the same quantity of storage available on the 745 as there is here.

Garmin Forerunner 745 versus 645 Music: Verdict

The 745 and the 645 Music are two different watches, yet they both cater to an audience that is comparable to one another in terms of age and gender. They present the same outer look and carry out tasks that are very similar to one another.

If you already have the 645, we do not believe that upgrading to the 745 would be helpful because there is not enough additional capability in the newer model. Put that off for still another year.

Unless, of course, you've got a desire for a brand-new wristwatch, in which case you should go ahead and indulge. If this is the case, you will be given a SpO2, sensors of the most recent generation, data about your breathing, extra information regarding the quality of your sleep, other performance metrics, sports profiles, and a great deal more. The battery life of the 745 is essentially identical to that of the 740, even though the 745 has a form factor that is slightly larger than the 740. Who are any of us to make assumptions and judgments anyway?

If this is your first time purchasing a cell phone, there is a strong chance that you will be able to find options to get the 645 and its Music variation at significant discounts if you look hard enough. It is difficult to provide a recommendation for a watch that is almost two years old and for which even Garmin is in the process of gradually stopping production.


Anas is an editor of a prestigious publishing company in the United States. She studied Mathematics in Arizona. Anas is also a teacher and one of her long-term goals is to build an institution that offers free education to everyone who are financially not stable. .

Leave a reply

Your email address will not be published. Required fields are marked *