<P> The Fitbit Charge 3 was released in October 2018 . It has a heart rate sensor as well as an oxygen saturation (SPO2) sensor . Sleep tracking has been improved from the Charge 2 . In November 2018, a special edition of the Fitbit Charge 3 will be released, featuring "Fitbit Pay" as a special feature . </P> <P> The Fitbit Ionic was released in late September 2017 . Designed to compete with the Apple Watch Series 3, it is the successor to both the Blaze and the Surge . Like the Surge, the Ionic uses built - in GPS, using GLONASS to tap into global satellites and provide better accuracy when recording exercises, with the antenna being integrated into the watch case for a stronger connection . The Ionic also features SmartTrack, which auto - recognizes user activity and records it in the Fitbit app . The Ionic has interchangeable bands, including classic Fitbit bands, leather bands, and perforated bands for a more sport - like appearance, and the release mechanism has been modified to make swapping out bands easier . It is also water - resistant, making it safe to wear when swimming . Many of the Blaze's clock faces return, as do several new clock faces . New to the Ionic is the ability to load apps onto the watch itself such as AccuWeather and Starbucks, as well as an NFC chip that allows the Ionic to be used for credit card purchases at places that allow contactless payment . As a result, the tactile buttons on the Ionic have some new functions . When not in workout mode, the right side buttons now function as shortcuts for the leftmost two apps loaded onto the watch, while a long press on the left side button brings up Fitbit Pay as well as music and quick settings . The Ionic is shipped in three color combinations of the wristband and watch case: Charcoal & Smoke Gray, Slate Blue & Burnt Orange, and Blue Gray & Silver Gray . </P> <P> In 2018, the Ionic was updated to Fitbit OS 2.0 alongside the release of the Versa . The most notable change from OS 1.0 is the addition of a new app called Fitbit Today, a much more intuitive and informative dashboard displaying the user's health and fitness data . It is accessible by swiping up from the clock face, while the notification tray is now accessed by swiping down from the clock face . In addition, a long press on the back button now opens up the music controls, payments, and the shortcuts screen, instead of just Fitbit Pay . In July 2018, Fitbit announced the 15 + Best Fitbit OS Apps for Travel, that can be downloaded in Ionic and some are also available in Versa . </P> <P> Released in April 2018, it has a square design with round edges, similar to the Apple Watch and Pebble watches . It retains most of the Ionic's features and interface . It is capable of tracking women's menstrual cycles . It does not have built - in GPS like the Ionic, instead using connected GPS like the Blaze . </P>

How to tell what model of fitbit i have