ESPEN is designed to strike the perfect balance between professional and engaging, to ensure the site comes across as trustworthy and a reliable source of data, allowing the data to speak for itself and to ensure users can easily find exactly what they're looking for.​ The importance and relevance of the data is promoted by making it clear how the data is separated, and gently guiding the user through their journey. The strong use of icons and minimal copy is intended to prevent the user from needing to think more than necessary, and combine to make for an enjoyable experience.