Show HN: A web app to show if it's better to plug in your EV today or tomorrow

We're on a dual-rate electricity tariff and often have flexibility about what night to charge the car, but is it better to plug in for tonight or tomorrow night? I got bored of working it out so I made an app for to do it for me.

More info and instructions in this blog post: https://unop.uk/electric-shift-web-app/

If you have any comments or feedback then please reply here or email me (contact details on my blog).