This app was mentioned in 2 comments, with an average of 1.00 upvote
Earlier I was researching just making a simple RaspberryPi (or similar) server, but then I realized sinking hours into a project to save me seconds of time is a bad idea when I already have other projects that need to be finished.
I prefer wifi because - like you mentioned - I don't want to invest in any other home automation hub.
edit:
> I suspect the wifi one is cloud-based.
Yeah, I just checked. Here is their app, and confirmed that you must log into their site.
The runtime tracking is accessed through the apps or the website. Website | Android app | iPhone app