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Activity trackers can make the perfect gift for your mom, your friend, your PE teacher or even yourself.

Fitbit makes some of the most popular models, but before you聽聽one, use this guide to determine which type is best for your situation. We鈥檝e put six聽聽models head to head to help you compare prices, features and functionality.

Fitbit Zip

Price:聽$59.95 from聽
Features:聽The Zip 鈥� the least expensive tracker聽of the six聽鈥� is a small, water-resistant device that can be clipped onto clothing. It聽features an easy-to-read display, is sold in a variety of bright colors and syncs wirelessly to compatible devices. It tracks steps, calories, distance, active minutes and time of day.
Battery life:聽Four to six months
Good fit for:聽Casual athletes who are looking for a simple, affordable and functional activity tracker.

Fitbit One

Price:聽$99.95 from聽
Features:聽Like the Zip, the One can also be clipped onto clothing. It tracks聽steps, distance, calories burned, floors climbed, active minutes and sleep. It also features a clock and silent vibrating alarm. The product includes a simple OLED display and syncs wirelessly to compatible devices.
Battery life:聽10 to 14 days
Good fit for:聽Fitness enthusiasts who want to monitor both their activity and their sleep, and don鈥檛 want to wear something on their wrist.

Fitbit Flex

Price:聽$99.95 from聽
Features:聽The Flex is a sleek and stylish wristband that costs just under $100. It tracks sleep, steps, calories and distance traveled. It also includes聽a silent vibrating alarm and can sync wirelessly to compatible devices. It doesn鈥檛 have聽a traditional screen, but the slim wristband displays LED lights that show progress toward聽goals.
Battery life:聽Up to five聽days
Good fit for:聽People who want a water-resistant wristband, which allows fitness tracking to continue, no matter the activity.

Fitbit Charge

Price:聽$129.95 from聽
Features:聽At a cost of $129.95, the Charge is a step up (price-wise and feature-wise) from the Zip, One and Flex. This model features activity tracking (steps, distance, calories burned, floors climbed and active minutes), a clock, sleep tracking, auto sleep detection, silent vibrating alarm and caller ID. The wristband has an聽OLED display and can wirelessly sync to compatible devices.
Battery life:聽Seven to 10 days
Good fit for:聽Dedicated athletes who want an all-encompassing sleep and activity tracker without having to pay the price of a more advanced smartwatch.

Fitbit Charge HR

Price:聽$149.95 from聽
Features:聽The Charge HR is similar to the聽Fitbit Charge, but also includes聽continuous heart rate monitoring. Like the Charge, it聽features caller ID, exercise tracking, wireless syncing, a water-resistant design and an OLED display.
Battery life:聽Up to five聽days
Good fit for:聽Serious athletes who want a reliable and multifaceted fitness assistant for less than $150.

Fitbit Surge

Price:聽$249.95 from聽
Features:聽At the top of Fitbit鈥檚 fitness tracker line is the Surge, a $249.95 performance fitness GPS watch. Besides typical tracking, this watch has聽caller ID, text notifications, music control, continuous heart rate monitoring, GPS tracking and wireless syncing to compatible devices. The fancy聽features aren鈥檛 a substitute for tried and true fitness metrics, either; users can log their workouts, view exercise summaries, track distance, monitor calories burned, record floors climbed and calculate pace.
Battery life:聽Up to seven聽days (GPS battery life up to 10 hours)
Good fit for:聽People who want all the bells and whistles of a smartwatch like the Apple Watch Sport, but don鈥檛 want to pay almost $100 more.

Courtney Jespersen is a staff writer at NerdWallet, a personal finance website. Email:courtney@nerdwallet.com. Twitter:聽.

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