The definitive Fitbit buying guide reviewer and fitness fanatic James A. Martin used and tested every product Fitbit has ever released, including the new Charge. This in-depth buyer's guide will help determine which of the current six Fitbit models is right for you.

Do you have your eye on the new Fitbit Charge? Or would you rather a Surge, Flex or Zip?

You can now choose from a total of six different Fitbit activity tracking devices. As a longtime Fitbit user, I've tested all the available models, along with two trackers that were discontinued (Ultra and Force), as well as the company's Aria Wi-Fi-connected scale. If you're thinking about joining the sweaty ranks of Fitbit users, here's a guide to help choose the right device for you.

Fitbit Zip

fitbit zip quarter Fitbit

Pros: At $60, Zip is Fitbit's least expensive device [ Find it on Amazon *What’s this?* ]. Unlike other Fitbits, Zip uses a replaceable 3V coin battery that the company says last for six months. It also comes in five colors, but if you seek the most color options, you might want to get a Flex.

Cons: Zip is also different than other Fitbits because of its LCD screen, which isn't backlit and therefore is impossible to read in the dark. Zip is the only Fitbit that doesn't track sleep or provide silent alarms. Like Flex, it doesn't track stairs climbed, either. And like One, Zip — because it’s not worn on the wrist — can be easy to lose or inadvertently ruin in the washing machine, if left in a pants pocket.

Ideal Users: People who aren't particularly tech savvy, are just getting started in fitness tracking or who don't want to mess with recharging.

Fitbit Flex


Pros: If you buy a Flex ($100), you can choose from 10 wristband choices, many of which are sold as optional $30 three packs, as well as Tory Burch fashion bracelets ($38 to $195). Flex differs from other Fitbits in that it's a little "pod-like" device that you snap in and out of a wristband, which makes it simple to change wristbands from one color or style to another. It's also water resistant, so you can wear it in the shower — a rarity for Fitbit [ Find it on Amazon ].

Cons: Flex doesn't count stairs, and there's no display, other than LED lights (no actual step count) that illuminate to indicate how close you are toward meeting your desired goal.

Ideal Users: Fashion-minded folks who want basic activity tracking.

Fitbit One


Fitbit One activity monitor

Pros: One ($100) is my preferred pocket- or belt-worn Fitbit. It's more compact than Zip and, unlike that low-end model, it tracks sleep and stairs climbed. One is available in black and burgundy [ Find it on Amazon ].

Cons: The One's OLED screen is difficult to read in bright sunlight. For sleep tracking, you must wear One in the provided, but awkward, arm- or wristband. Like Zip, One — because it's often carried in a pocket — can be easily lost or ruined in a washing machine.

Ideal Users: People who don't want to wear an activity tracker on their wrist and want to track sleep and stairs-climbed.

Fitbit Charge

10 fitbitcharge

Pros: For $130, Fitbit's Charge wristband [ Find it on Amazon ] offers more features than Flex. It shows you caller ID notifications on the OLED screen, provided you sync your compatible smartphone via Bluetooth. (Caller ID is also available on Charge HR and Surge.) Like Charge HR and Surge, sleep tracking is automatic; you don't have to activate or deactivate sleep-tracking mode. Battery life is good, especially compared to the short-lived Charge HR and Surge. (For more details, check out my full Charge review.) It's available in four colors.

Cons: Setting up Caller ID was more challenging than I expected, the small screen can be hard to read, and it's not water resistant.

Ideal Users: Charge has a mid-range feature set — more than Zip, One and Flex, but less than Charge HR and Surge. It's is best for people who usually buy tech products that fall somewhere between low- and high-end.

Fitbit Charge HR

Pros: For only $20 more than Charge, Charge HR [ Find it on Amazon ] offers all the same features plus continuous heart-rate monitoring (no chest strap required), which is particularly important for athletes who want to get the most out of their exercise. It's available in four colors.

Cons: Fitbit says Charge HR can last for up to five days on a battery charge. In my experience, actual battery life is much less. For example, less than 24 hours after charging, and following a one-hour run using continuous heart-rate monitoring, Charge HR's battery dropped to 50 percent. You can turn heart-rate monitoring off via the Fitbit app, but you need to remember to turn it back on before exercising.

Ideal Users: Athletes who want to track their heart rates during exercise but don't want the bigger, chunkier Surge or another GPS watch.

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