The iDevices uses the Smart Life app (or one of the many branded off-shoots that are all basically the same app/API). There are actually a LOT of devices that use this app/API platform. I have devices from about 8 different brands that all work with this app/API platform. Many of the cheap(er) devices use this as the API is pretty easy to use and very low licensing costs and pretty robust as it provides a lot of functionality for a lot of devices. I have smart single outlets, smart multi-outlets, lights, etc that work with it. The app itself shows support for a large range of devices that already have integrations with it, such as Rice Cookers, Microwaves, Ovens, Breadmakers, Sous vide devices, washing machines, refrigerators, etc, etc, etc, etc. Granted a lot of these devices are probably not available in the US (yet) as the company behind this is a Chinese company, but I’m sure they’ll eventually show up. I think it would make a LOT of sense (not pun intented) for Sense to start working on integration with this platform as it really has a huge user base (potential).
The platform supports WiFi, Bluetooth and ZigBee devices for sure (I have all of these), not sure about Z-Wave. A lot of the devices I have connected to it do report power usage as well. I have several multi-outlet switches (2 indoor, 1 outdoor) that all report power usage per outlet. The biggest advantage of these devices is that they’re significantly cheaper than known brand products. My multi-outlet switches (3 outlets each) were < $15 each.