A CLKD file is a file created by Clicker Docs, an iPad app used to help develop document writing skills in young learners. The file stores a document which includes text, fonts, and other page layout elements. The CLKD file also includes word banks that provide vocabulary support for different topics such as fashion, society, and food.

Clicker Docs is part of the Crick Software family that specializes in educational tools. Other apps for iPad include Clicker Sentences, Clicker Connect, and Clicker Books. The Docs app specializes in teaching students to create accurate, flowing documents. It is especially helpful when working with struggling spellers and learners with dyslexia.