Although it doesn't appear here, I received an e-mail notification about how there's now a Kasa app in the Microsoft store. It's not clear whether it's from TP-Link directly, and it controls only the switches, not the cameras. It's also been there for almost 2 years.

https://www.microsoft.com/en-us/p/tp-link-smart-plug-utility/9pcd9x9m1p5c?activetab=pivot:overviewtab

@metropical A windows app that also collated / compared / graphed energy use would be amazing. 

We are completely off grid and use the energy feature of the KP115 extensively but find it laborious to work out current total use, for instance, as we need to add up each individual total manually.  A windows app (or even an extra feature of the smart phone app) that allowed for these types of features would be awesome

@metropical Absolutly.