Blauwtipje.nl app for iPhone and iPad
With this app you have a ID-key, full species descriptions and a load of information on all nudibranch species of the Netherlands. Also included are some species that are regularly confused with nudibranchs. And an extensive glossary. Over 1100 photos of sea slugs and nudibranchs are included. You can upload you own nudibranch pictures to help you with the identification.