Fitbit is no stranger to the activity tracking market. It's been kicking around for a good few years now, sitting at the top of its class smugly watching as its competitors hope to raise the same brand awareness.

Chances are if you are reading this feature, you too have heard of it. The problem you have probably since found however, is deciding which of the seven Fitbit activity tracking devices is the right one for you.

We have broken each of the Fitbit trackers down into how much each costs, what features each offers and why you might considering buying each one. This feature is all about helping you work out which Fitbit will suit you and your lifestyle best.

FitbitZip

The Fitbit Zip is the cheapest activity tracker available within the company's portfolio. It measures steps taken, distance travelled, calories burned and active minutes. There is also a clock feature and it will sync wirelessly to the smartphone app or your computer.

The Zip is a clip-based device that can be worn on a belt, pocket or a bra. It has an LCD display and its replaceable coin battery should last between four and six months. The Zip is also sweat, rain and splashproof.

Through the Fitbit app, Zip users will be able to see their progress, complete challenges with friends, log food, record workouts and earn badges. The Fitbit Zip comes in charcoal, lime, midnight blue and magenta colour options.

The Fitbit Zip is cheap and allows you to monitor basic activity discreetly.

PRICE: £49.99

READ MORE Fitbit Zip review

FitbitOne

The Fitbit One is similar to the Zip, only it adds sleep tracking to its list of attributes, as well as a more slender design. Like the Zip, it will sync wirelessly to the app or your computer and it is also a clip-based device so you can wear it on a belt, pocket or bra.

Rather than an LCD display, the One opts for an OLED screen and its battery type changes to a lithium polymer rechargeable number rather than a replaceable one like in the Zip. The One is said to offer between 10 and 14 days on a full charge.

The same app features apply as the Fitbit Zip, but users with the One will also get access to sleep trend graphs, sleep goals and sleep quality data. The Fitbit One comes in black or burgundy colour options.

The Fitbit One is a little more expensive than the Zip but it adds sleep tracking to the mix so this device is good for someone who wants basic sleep and activity tracking without having to wear anything on their wrist.

PRICE: £79.99

READ MORE Fitbit One news

FitbitFitbit-Flex-2_Woman_Lifestyle

The Fitbit Flex 2 replaces the original Flex and it sits within the "Everyday" category of the Fitbit products, like the Zip and the One. It offers exactly the same as the Fitbit One in terms of tracking features so that means steps, distance, calories, active minutes and sleep tracking.

The OLED display is replaced by five LED lights, meaning more visits to the app for progress details, while the design moves from a clip-on device to a wrist-worn band. As there is no display, there is no clock feature like there is with the Zip and One, but the Flex 2 does offer text and call notifications in the form of colour-coded LED lights. Battery life is up to five days.

The Flex 2's tracker is removable so while you can stick with the standard rubber band comes with, you can also buy special accessories. There is a bracelet in gold, silver or rose gold options and a necklace in gold or silver for those that want to increase their fashion status with their step count. For those happy with the rubber band, it comes in four colours including black, navy, lavender and magenta.

The Fitbit Flex 2 is a simple, stylish activity tracker that will do the activity basics, plus sleep tracking and smartphone notifications (sort of). It is easy and comfortable to wear and a little more on trend than clip-on devices currently are, which might be a reason to select it over the One. It is also the only waterproof Fitbit tracker.

PRICE: £79.99 (available October)

READ MORE Fitbit Flex 2 preview

FitbitAlta

The Fitbit Alta is the one of the more recent additions to the company's line up and the final device in the "Everyday" range. It offers many of the same features as the Flex 2, meaning no elevation or heart rate data, though it does smartphone notifications in a slightly more useful way compared to the Flex 2.

The Alta is slim and sits in line with the Flex in terms of size but the display allows you to see your progress and alerts, including text notifications, incoming caller ID and calendar alerts. The same app functions apply as the Flex 2, along with the same battery life, which stands at five days but the Alta is not waterproof.

The Fitbit Alta comes in four standard colours comprising black, blue, teal and plum, but there are also two leather band options for an extra £50 each or a metal bracelet for £80 extra.

The Fitbit Alta is the tracker for those that are after basic activity tracking information at a glance, in a slim and stylish design.

PRICE: From £99.99

READ MORE Fitbit Alta review

FitbitFitbit-Charge-2_Business-Man_Incoming-Call_Lifestyle

The Fitbit Charge 2 is the first of two devices within the "Active" portfolio and it replaces the Charge and Charge HR in one device. All the features of the Charge HR are present in the Charge 2, including activity and sleep tracking, as well as automatic exercise recognition and continuous heart rate monitoring, but the new device adds a couple more functions too.

The Charge 2 looks similar to the Charge and Charge HR in design, meaning it is slightly larger than the Alta and Flex 2. It adds interchangeable straps and a display five times larger than that of the previous models, presenting daily stats, the time and smartphone notifications including calls, texts and calendar alerts, like the Alta. The new device also offers a feature called Cardio Fitness Level, which gives you a personalised fitness score over time, and Guided Breathing, which offers personalised breathing sessions based on your heart rate.

There is also Connected GPS on board the Charge 2 and battery life is sits at up to five days, so around the same as the Flex 2. It is sweat, rain and splash proof, but not waterproof like the Flex 2. App functions are the same as the other devices but you'll get the added bonus of being able to monitor your heart rate data, as well as see more detailed analysis of workouts.

The Fitbit Charge 2 comes in black and silver, plum and silver, blue and silver, and teal and silver. There are also two special edition models and a number straps that can be bought separately for a different look.

The Fitbit Charge 2 offers more advanced activity tracking thanks to the continuous heart rate monitoring and it also brings several extra features, including smartphone notifications. It is a little more expensive than the models above it on this list, but it brings a lot to the table, especially with the ability to change the straps.

PRICE: From £129.99

READ MORE Fitbit Charge HR review or Fitbit Charge 2 preview

FitbitBlaze

The Fitbit Blaze is the second in the "Active" range and one of the newer Fitbit devices. It offers everything the Charge HR offered, along with a couple of extra features, as you are probably starting to expect.

A feature called Multi-Sport was introduced on this model, allowing you to choose various sport modes and see real-time stats, though this is also available on the newer Charge 2. The Blaze also offers text notifications like the Alta and Charge 2 and introduces music control and GPS tracking. It is worth mentioning that it is Connected GPS tracking though so you will still need your phone with you, as you do with the Charge 2. There is a five-day battery life and it is sweat, rain and splash proof.

The Blaze is more like a smartwatch than the other activity trackers we have already mentioned, offering a coloured touchscreen and the option of various straps and frames. The classic band comes in three colours comprising black, blue and plum, but there are three leather options and a metal links model too.

The Fitbit Blaze is for for those that want an activity tracker that is a little smarter looking, as well as one that offers a couple of extra functions such as music control. It is the Fitbit for those after an activity tracker that could potentially replace their watch.

PRICE: From £159.99

READ MORE Fitbit Blaze review

FitbitSurge

The Fitbit Surge is the most expensive and most feature-rich Fitbit device, categorised by the company on its own under "Performance". It is more of a watch than a band, like the Blaze, but the Surge comes with a monochrome display (rather than coloured) and proper GPS tracking, meaning you can track a run without your phone.

The Surge offers everything the Blaze does in terms of other features, including music control, text message notifications, and the multi-sport feature. It is tested up to 5 ATM but it remains just sweat, rain and splash proof so you still shouldn't take it in the shower and certainly not for a swim.

In terms of battery life, the Surge is said to last up to seven days and it offers the same app functionality as the Blaze and other Fitbit devices, with the added advantage of maps of where you have gone for a run or walk with the GPS on. The Fitbit Surge comes in black, blue and orange.

The Fitbit Surge has all the features available within a Fitbit device so it will track basic activity, as well as more specialised activities like free running. It's not cheap but if you want all the features Fitbit has to offer, this is the one for you.

PRICE: £199.99

READ MORE Fitbit Surge review