Douglas Software is a privately-held technology company based in Hampshire, United Kingdom. The company was founded in 1998 by Douglas Green, an independent software engineer with many years experience of photography. Douglas Software specialises in photographic software and hardware product development. Among our main products there is the Douglas Photo Calculator for iOS, Android, Windows and Mac as well as the Douglas Sun & Moon Calculator and the Douglas Grey Card. The Douglas Sun & Moon Calculator is a Solar and Lunar database for photographers, astronomers, anglers, cinematographers, gardeners and anyone else who needs to know the position of the Sun and Moon from any location at any time. The Douglas Grey Card is an essential tool for the serious photographer and is one of the very few truly neutral and true 18% grey cards.