WeighUp
An energy bill comparison tool — pick electricity or gas, tell it roughly what you use, and see instantly whether you're overpaying, with plans ranked cheapest-first.
The idea
Most people suspect they're paying too much for energy but never get around to checking — the comparison sites are clunky and ask for too much before they show you anything. WeighUp is our take on doing it well: one screen, a couple of sliders, and an honest, ranked answer.
What it does
Choose electricity or gas, pick a household size (or drag the usage slider), add your solar export and what you pay now — and the plans re-rank cheapest-first instantly, with no page reloads. Each plan shows the estimated annual and monthly cost, how much you'd save versus the dearest option, and badges like cheapest, no lock-in and best solar feed-in. Enter your current bill and it tells you, in plain dollars, how much you could save by switching.
How it's built
A single Blazor Web App on .NET 9 with interactive server rendering — the calculator recomputes on the server as you move a slider and streams the result back, so it stays fast and needs no client-side framework. The comparison engine is a small, testable piece of C# that models supply charges, usage rates, discounts and feed-in tariffs; the plan list is swappable, so a production build plugs straight into the AER's Energy Made Easy / Consumer Data Right plan data.
Honest by design
WeighUp ships with clearly-labelled sample plans for the demo — never fake numbers dressed up as live tariffs — because a tool that helps people with money has to be trustworthy first. It's the same principle we bring to every build.