Footcandle: Lux Light Meter

See how much light a spot really gets, in lux and foot-candles, using your iPhone's camera. Free to measure. No battery, no trial tricks, no ads. Pro is a one-time purchase. THREE WAYS TO MEASURE • Flat: lay your phone face up and cover the front camera with one sheet of plain printer paper. Best for window sills, desks and plant shelves. • Card: point the back camera at a sheet of white paper lying where you want to measure. No accessory needed. • Quick: no paper, a rough reading in a second. Each method shows a short guide before your first reading, never a popup over the number. HONEST NUMBERS • Estimates from your iPhone's camera. Calibrate with one tap if you have a meter. • Calibrate your own paper: measure the same spot with Card, then Flat. • "Steady" tells you when the reading has settled. Hold keeps the number after you pick the phone up, with an optional beep. • Too dark or…