Live2026

WattSnap

Aim your phone the way a solar panel would face, on a balcony, roof, garden or campervan, and see what it could generate and what it's worth.

Visit project

Solar shouldn't be a guessing game. WattSnap turns your phone into a sunlight value meter.

Aim it the way a panel would face (on a balcony, a roof, a garden, a campervan), trace what blocks the sky, and get an estimate of how much electricity, and money, a panel there could generate. It runs in the browser with nothing to download, and it's built around UK plug-in solar. Less a solar calculator, more a way to see what your sunlight is worth before you spend anything on it.