Having recently had a smart meter fitted there are apps out there that can tie into your meter giving you accurate half hourly monitoring without additional hardware.

For example I found an app called Octopus Compare that I can code to my smart meter and look at what different tariffs would cost me. I can also see from the Octopus dashboard my usage and export in half hourly blocks so this data should also be available with the right logins.

So there must be some cool apps out there that monitor, advise, correlate but when I search I'm mainly finding proprietary software that talks to specific brand inverters.

Any recommendations?