First of all, this is the National Gallery on Trafalgar Square in London, not the National Gallery of Art in Washington, DC. If you're going to the gallery, the app would be a great aid in planning the visit to maximize how much you could see in the time you have. And if you're not planning a visit, the tremendous collection of European art described in the app could give many hours of enjoyment for an art lover.
J. Chambers (Georgia, US) (Review given for Museum Buddy National Gallery on the Amazon Appstore)