The Fitbit Charge 4 and Fitbit Inspire 2 receive new features in their latest software updates

Fitbit has announced in two blog posts that it will bring new features to the Charge 4 and Inspire 2. The company has bundled these features in new software updates for the device that Fitbit will distribute as over-the-air (OTA) downloads. The Fitbit Charge 4's latest update should be available now, while the Inspire 2's will be rolling out throughout next week.

While Fitbit has announced the updates simultaneously, they bring different features to the two devices. Arguably, the Charge 4 has received a more significant update as Fitbit has added three features to the one that it has included in the Inspire 2's update. Specifically, the Charge 4 can now measure SpO2 levels overnight, which can be viewed within the Health Metrics Dashboard. Additionally, the fitness tracker can now detect and record changes in your skin temperature, which Fitbit asserts allows you to monitor for the onset of a fever or even ovulation.

Skin temperature changes can be checked from within the Health Metrics Dashboard, which is the final addition to the Charge 4's feature set. According to Fitbit, the dashboard offers a free 7-day view of health metrics, but you must subscribe to Fitbit Premium if you want to view historical data. Currently, a Fitbit Premium plan runs to US$9.99 per month or US$79.99 annually.

Meanwhile, Fitbit has added Tile tracking to the Inspire 2. Presumably, Fitbit has chosen Tile because the Inspire 2 lacks a GPS modem. Hence, the Inspire 2 relies on Bluetooth location data provided by a paired smartphone. The fitness tracker uses Bluetooth Low Energy to do so, which may prove helpful if you ever lose your Inspire 2 for some reason.

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