Screen density is the quantity of pixels within a physical area of the screen; usually referred to as dpi (dots per inch). For example, a "low" density screen has fewer pixels within a given physical area, compared to a "normal" or "high" density screen. This plugin reports the screen density metric of the user's device.
In Countly density metric is reported in different ways for different platforms. For instance for an Android application screen densities will be reported as LDPI (low), MDPI (medium), HDPI (high), XHDPI (extra-high), XXHDPI (extra-extra-high), and XXXHDPI (extra-extra-extra-high) whereas in iOS screen densities will be reported as @1, @2 and @3.