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Which Fitbit is best to buy? Fitbit Flex vs Fitbit Force, One or Zip activity tracker

Which Fitbit is right for you – we detail best price, features, display, specs, looks, and battery life.

Fitbit trackers compared

Fitbit sells two activity tracker wristbands: the Fitbit Flex and the Fitbit Force. Which is best for you? Which one should you get? Should you wait for the Fitbit Force or buy the Flex now? And we have new information on new Fitbit Surge and Charge trackers.

Or should you consider the clip-on Fitbits: Zip and One?

Also read: New 2014 Fitbit activity tracker release date, price, specs, new features: coming very soon

Choosing the best Fitbit for you will come down to features and price, but you should also consider size, battery life and of course looks. Which Fitbit is best depends on what you want and how much you’re willing to pay. We explain all in the buying guide to the Fitbit activity trackers. Fitbit trackers compared and features in detail.

With new Fitbits just weeks away we suggest waiting to see what prices and features are offered with the new line up.

Fitbit One review

Fitbit Zip review

Fitbit Flex review

Fitbit Force review

There are other activity trackers, of course. Here's our round up of the best activity trackers currently available.

Which Fitbit: price

Let's start with a key factor: cost. None of the Fitbits are pocket change but none are horrendously over-priced either.

The Fitbit Flex costs £79.99, £20 cheaper than the Force (£99.99). UK customers have waited months since the Force went on sale in the US, but although it showed up briefly on the UK Fitbit Store it remains unavailable in the UK, and will likely never go on sale following user some instances of allergic reactions from users in the US. NEWS UPATE: Fitbit withdraws Fitbit Force! There are still a few Force trackers available via sites such as eBay, and these tend to sell for around £140.

If price is important you may be better off trying the clip-on Fitbit Zip or Fitbit One instead.

The £79.99 One costs the same as the Flex, but, as we’ll see, offers more features. You can also find it on sale online for a tenner cheaper at £69.99.

The Fitbit Zip has an RRP of £49.99 but is available online for around £40.

We don't know when the next-generation Fitbit activity trackers will go on sale, and at what prices, but we do know from Fitbit tracemark applications that it is highly likely to release new trackers, probably from this autumn, featuring extra features such as heart-rate monitors, GPS and even weather information.

Which Fitbit: features

Fitbit trackers compared. The cheaper clip-on and wristband Fitbits (Zip and Flex) don’t offer all the features found on the One and Force.

All Fitbits have a MEMS 3-axis accelerometer that measures motion patterns to determine your calories burned, distance traveled, and steps taken. All but the Zip also monitor sleep quality.

The One, Flex and Force also contain a vibration motor, which allows it to vibrate when alarms are set to go off.

The One and Force boast an altimeter that measures stairs climbed.

Fitbit trackers compared

Top 10 tips for hitting your Fitbit step goals

Which Fitbit: display

The Zip display has five modes: Steps; Distance; Calories burned; Fitbit Smiley (highlights your recent activity level); and Clock.

Fitbit Zip display modes

The One’s display has six modes: Steps; Distance; Calories burned; Floors climbed; Flower (grows and shrinks based on your recent activity); and Clock.

Fitbit One display modes

The Flex’s display is the most minimal, consisting of a series of flashing dots that show you how your day is stacking up against your goals. Each light represents 20 percent of your goal. You just tap the display twice to see your progress against your daily goal. This is very easy to get used to but isn’t as informative as the other Fitbits. Of course you can see all your stats via the Fitbit iPhone or Android smartphone app.

Fitbit Flex display modes

The Force has seven modes: Time; Steps; Distance; Calories burned; Floors climbed; Very active minutes; and Alarm.

Fitbit Force display modes

Which Fitbit: measurements and specs

While the Fitbit One and Zip are small and can clip onto clothing or sit in your pocket they’re in some ways less flexible than the wristbands.

You’re less prone to forget a fitness wristband than you are a tiny clip-on gadget, and, crucially, less likely to lose the valuable device.

The Flex is thinner and slightly lighter than the Force. The Flex is 13.99mm wide, compared to the Force’s 19.2mm girth. As the Force also includes a watch function it might actually save you wrist space as you can ditch your watch. If only the Force was still on sale! That said, as an activity tracker rather than a watch, the Flex is great.

The Zip is the smallest of the Fitbits – it’s shorter than the One but podgier.

When you buy a Flex you get both a large (161-209mm) and small (140-176mm) wristband, but with the Force you need to specify whether you want small or large, as the tracker itself is built into the band. You can check with Fitbit’s online wristband sizing tool.

Fitbit Zip size and weight: H: 48mm; W: 19.3mm; D: 9.65mm; W: 8g.

Fitbit Zip measurements specs size

Fitbit One size and weight: H: 35.5mm; W: 28mm; D: 9.65mm; W: 8g.

Fitbit One measurements specs size

Fitbit Flex size and weight: W: 13.99mm; W: 29g.

Fitbit Flex measurements specs size

Fitbit Force size and weight: W: 19.2mm; W: 30g.

 Fitbit Force measurements specs size

Which Fitbit: battery life

Remembering to keep your Fitbit charges is important if you wish to keep your activity tracked. The longer the battery life in between charges the better, then.

The Zip is easily the best for battery life but you will need to buy a new battery two or three times a year. The 3V coin (CR 2025) battery is cheap, though – you can buy a pack of five for under £2.50. The other Fitbits feature rechargeable batteries.

The Fitbit Flex lasts the shortest time between charges. Remember that accessing the display on any of the Fitbits will drain the battery faster.

Fitbit One battery life: 5-7 days

Fitbit Zip battery life: 4-6 months

Fitbit Flex battery life: 5 days

Fitbit Force battery life: 7-10 days

Which Fitbit: water resistance

Sadly none of the Fitbit activity trackers can monitor your swimming, and you can’t later log this fitness info into your numbers yourself. But you can at least wear your Flex in the shower, unlike the other Fitbits that are less happy getting wet.

I did wear my Flex while swimming and after a few months the rubber wristband did begin to perish a little, and my wife claims that it started to smell – so best taken off for long periods of liquid submersion.

The Fitbit One, Zip and Force are splash proof, but should not be submerged more than one metre.

The Flex is water resistant, and can be submerged up to 10 metres.

Which Fitbit: colours

The Fitbit One is available in either Burgundy or Black.

Fitbit One model colours

The Fitbit Zip is the most colourful, available in either Blue, Magenta, White, Charcoal or Lime.

Fitbit Zip model colours

The Flex wristband is available in ten colours: Black, Slate, Tangerine, Teal, Navy, Violet, Blue, Lime, Pink and Red. You can buy extra bands (without the tracker) for £12.99.

Fitbit Flex Colours UK

The Force was sold in just Black and Slate. Slate is a greyish blue.

Fitbit Force model colours

Which Fitbit: what you get in the box

The Fitbit Zip ships with tracker, silicone and metal clip, wireless sync dongle, replaceable battery and battery door tool.

Fitbit Zip box contents

The Fitbit One comes with tracker, silicone and metal clip, wireless sync dongle, charging cord and sleep wristband.

Fitbit One box contents

The Fitbit Flex includes tracker within wristband (small and large), wireless sync dongle, and charging cable.

Fitbit Flex box contents

The Fitbit Force comes with tracker within wristband (either small or large), wireless sync dongle, and charging cable.

Fitbit Force box contents

All work with the Fitbit desktop dashboard and iPhone and Android apps.

Which Fitbit Force trackers compared

Which Fitbit is best for you?

It’s possible to look at the Fitbit activity trackers in two groups. (We are ignoring the Fitbit Ultra as that is no longer available.)

The clip-on One and Force wristband boast the most features, including Floors Climbed via the altimeter. They also show more right there on their displays. Sadly the Force has been withdrawn from sale, although you can buy them secondhand from online sites such as eBay. The One remains available.

The Zip and Flex are cheaper but don’t include the altimeter so climbing lots of stairs will count only as Steps and not as the harder climb. Of course floors climbed counts as Steps on the One and Force, too.

The Zip doesn’t vibrate when you reach your targets. And it doesn’t monitor your sleep efficiency.

The Zip is the cheapest Fitbit, and if you can live without the altimeter and sleep tracking then this is a great entry point. Sleep tracking is fun but not at the top of most people's fitness lists, but the buzz is a great way to know you’ve reached your key target. Is that worth an extra £30 for the One or Flex? That’s really up to you.

Fitbit Flex vs Fitbit Force: When it comes to choosing between the two Fitbit wristbands we love the Flex’s minimalism but think the Force’s better display and altimeter make it worth the extra £20-30, depending on where you buy it. The trouble is that Fitbit withdrew the Force because a minority of users suffered an allergic reaction to the metal casing. You can still find them on eBay but bidding can be intense. If money is no object then keep bidding. We found the average going price to be around £140.

The Flex is a great activity tracker in its own right, and syncs well with your smartphone and computer. It's also available in more colours.

Fitbit will bring out a new Force-like wristband later this year – we're betting on this autumn, probably October. Maybe buy a Flex now and see how you like it. When the new device is released you could always sell your old one to part fund the new. Any old Fitbit can be re-synced to a new user so this isn't a difficult process. I gave my Flex to my wife who is now crushing me in my Fitbit Friends league table!

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