Big Butterfly Count is an educational iPhone app that allows users to participate in the UK's annual butterfly count. Spend 15 minutes in nature, identify and count butterfly and moth species, and submit your sightings to contribute to understanding butterfly populations. The app features a comprehensive ID guide with information on 21 key species, aiding users in species identification and learning.

Additionally, users can access a map displaying everyone's submitted counts, providing a collective view of butterfly sightings. Big Butterfly Count aims to engage users in citizen science, offering a simple and informative way to help monitor butterfly populations in the UK.