An app from Profile Books and Touchpress has won the adult non-fiction app prize at the Digital Book Awards 2015.
Incredible Numbers, by Professor Ian Stewart, explores the hidden patterns of numbers with a range of articles and interactive demonstrations.
Profile and Touchpress were the only UK winners at the US awards, held as part of Digital Book World, though other UK publishers were shortlisted, including Nosy Crow in the children's app category for Jack and the Beanstalk, and Harlequin UK for its multimedia project, The Chatsfield.
Michael Bhaskar, outgoing digital director at Profile Books, said: "We are absolutely delighted to win this award. Ian Stewart brings the sheer wonder of maths alive like no one else and the Touchpress team did it full justice. Which other app lets you break the Enigma code or visualise the mathematics of music."