That iconic weather clock has been in place since Sense launched in 2009 on the HTC Hero.While the widgets have changed slightly with each iteration of Sense, the effect is very similar, but so much more refined now.
HTC Sense 4.0 is the latest version of HTC's user interface, layered over the top of Android 4.
It lands on the HTC One series, as seen the HTC One X reviewed here.
Sense 3.6, on the other hand, is something of a halfway house between "old Sense" and the newer cleaner Sense.
If you're interested in HTC Sense 3.6, we gave it a thorough reviewing here when it landed on the HTC Sensation XE.
HTC Sense 4.0 will be present on devices moving forward (until HTC moves on again) with Sense 3.6 landing on devices as they are updated to Android 4.0, Ice Cream Sandwich.
We've asked HTC whether it will be bringing Sense 4.0 to older devices and that doesn't seem to have been determined yet; we suspect not.
So, if you have an existing HTC Android smartphone due for upgrade to Android 4.0, it's almost certain you'll receive Sense 3.6.
Here we'll walk you through the main differences between the two versions, so you can see what you're missing out on, or not.
Sense does differ from device to device: here we are reviewing Sense 4.0 on the HTC One X and Sense 3.6 on the Sensation XE.