The register knows no prices – it lists installations, not tariffs. What a station costs you depends on your contract: the same charge point costs two customers different amounts. Enter your cards once and results will show a price, and the invoice check comes pre-filled.
Everything stays in this browser. Your tariffs are never sent to the server – which provider you are a customer of and what you pay there is none of this application's business. The price for that: the cards live on this device. To take them elsewhere, export them below.
Because the cards live only in this browser, exporting them is the only way to a second device. Importing merges rather than replaces – a card that already exists here under the same name is left untouched.
Compare your cards against each other? Which of your cards is cheapest at which operator is only visible at the individual station today. Calculated across a year of charging it would show which one you actually need – and which one you pay for without using.
One click, nothing more: no address, no account, no mail. All that is counted is how many people wanted it – that is what decides what gets built next.