The magazine was published by Doodle Productions Ltd and created in 2007 by artist Rachel Ortas and scientist Sophie Dauvois.
Starting in 2014, OKIDO was published by Doodle Productions Ltd. Each issue starts with a story from Ortas's character Messy Monster and also includes science answers from Zim, Zam, Zoom, regular character features, stories, puzzles, doodles, games, activities, science experiments, a poem, a recipe and a pull-out card activity.
Regular character stories include "Messy Monster" by Rachel Ortas, "Zim Zam Zoom" by Alex Barrow, "Yoga Monkey" by Paul Noble, and "Squirrel Boy" by Beth Morrison.
In September 2015, Messy Goes to Okido, which has been developed from the magazine, was launched on the BBC's CBeebies channel as a 104-part television series aimed at three to five-year-old children.
The program has also helped to expand the Okido brand overseas, as it airs in numerous foreign nations and has dubs in over 10 different languages.