You can spot a Fitbit from across the room. The Fitbit Charge HR and Surge, the company's two most popular trackers, aren't exactly jewerly, and I would never be caught wearing one to a wedding or another formal event. But Fitbit is changing.

While ultimately a more stylish (but heart-rate free) version of the older Charge HR, the Fitbit Alta is a winning fitness tracker with solid style appeal.

The Fitbit Alta is a stylish fitness tracker with swappable bands, basic phone notifications and week-long battery life; The new "Move" alerts bring something new; Fitbit's software is still one of our favorites, and has the largest social base as well.

There's no heart-rate sensor, and it can't be worn in the shower; The tracker is expensive for what it can do and so are the accessory straps; The display is difficult to see outdoors and is susceptible to scratches, and notifications are hard to read.

A Fitbit, for better or worse, looks like a Fitbit. For the past seven years Fitbit's product design has skewed toy-like, friendly, utilitarian. A Fitbit won't be mistaken for jewelry; it's not high-fashion, though it may try ; it's a Fitbit.

More fashionable Fitbit; Auto-tracks exercise and sleep; Week-long battery life

Tap-screen display; No heart-rate sensors; No software leaps since 2015

Don't expect to earn too many style points with the $130 Fitbit Alta, and you won't be disappointed. The fitness tracker is good as an everyday accessory for those with smaller wrists, and accurately monitors your activity.

Slim design with interchangeable bands; Accurate; automatic sleep tracking; Easy-to-use app

Finicky "touch" screen

A basic fitness tracker that looks good, but doesn't really do much to stand out

Great app; Automatically tracks workouts; Week long battery

No heart-rate monitor; Annoying charger; Not waterproof; Screen not overly responsive

Update : Fitbit has beefed up the sleep-tracking capabilities of its companion app. The new feature, called Sleep Schedule , does much more than just track the amount of time you've slept each night, it learns from your habits and compares them to the anonymously collected data of other Fitbit...

The main reason I bought this was for the sleep stage tracker and it's exactly what I was hoping for; It seems to be very accurate and I now know my stages of sleep that need improvement; It also gives hints and advice on how to improve sleep quality

It takes a fair bit of tapping the screen of the watch to get it to change the display; Maybe I just haven't got the hang of it yet

The Fitbit Alta HR is the first product that we've reviewed in a while that does exactly what its marketing material says it does, and holds no surprises beyond that. But is that such a bad thing? The Alta HR looks and feels very familiar to past offerings from the company.

The $129.95 Alta is the first wrist-worn fitness tracker from Fitbit that doesn't really look like a Fitbit (save for the new watch-like Blaze ($142.95 at Amazon UK)(Opens in a new window) ). It's sleek, slim, and has a modular design that can be changed to match your outfit each day. Think of it as the new, fashion-forward Fitbit Charge ($142.95 at Amazon UK)(Opens in a new window) . It tracks many of the same stats as the Charge, including your active minutes, distance, calories, sleep, and steps. And it goes even further, with idle alerts and text notifications from your smartphone. But the Alta lacks an altimeter, GPS, or heart rate monitor, which means athletes who need more advanced features are better off checking out one of Fitbit's other trackers, like the Charge HR ($142.95 at Amazon UK)(Opens in a new window) or the Surge ($142.95 at Amazon UK)(Opens in a new window) .  Design and Display The Fitbit Alta ($142.95 at Amazon UK)(Opens in a new window)  tries its best to ...

The Alta is Fitbit's sleekest, slimmest fitness tracker yet, but if you don't care about looks you can get more functionality for nearly the same price.

Slim design; Swappable bands; Accurate fitness stats; Delivers idle alerts and smartphone notifications

Sometimes unresponsive; Display is tough to see in direct sunlight; No heart rate monitoring, GPS, or stair climbing; Not waterproof

Occasionally, a Beckenbauer, Ennis-Hill or Phil Neville will arrive with the combined talents of an entire team. But most of the time, all-rounder means almost.

No one needs an activity tracker. Sure, you feel a whiff of superiority wagging your wrist and boasting about how much ground you've covered today. But let's not pretend that wearing a wrist computer makes you a better person.

Prettier than its predecessors with a litany of interchangeable bands; Automatically recognizes and logs activity when you're walking, running, or biking; Battery lasts a full week between charges

The silent alarm is too timid to reliably wake you up. Sleep insights are a bore. No GPS tracking or waterproofing; runners and swimmers are out of luck