I am the person who built this, so take the rest with whatever grain of salt that deserves. Not linking it here - if anyone wants it after reading, it's on my profile / just ask in the comments. Backstory: I went down a rabbit hole a while back after reading that a meaningful share of utility invoices contain some kind of error - wrong billing period, a meter misread, an estimated-vs-actual mixup, sometimes just a flat wrong number. Most people never catch this because checking means pulling your actual meter reading, doing unit conversion by hand, and comparing it to whatever the bill says - which nobody has time for, so the bill just gets paid. So I built a small utility-tracking app (web + iOS) that does three things I actually wanted for myself: You log meter readings (manually, or