Adult coloring books face threat from app rivals Colorfy, Recolor and more - Los Angeles Times

Adult colouring books? Inevitably, there's an app for that, Apps

Recolor - Adult Coloring Book - Apps on Google Play

Recolor - Adult Coloring Book - Apps on Google Play

Recolor: Coloring Book. by Sumoing Ltd

New Coloring Books Finds - Friends Coloring Book

New Coloring Books Finds - Friends Coloring Book

Addison Rae Coloring Book : A Cool Coloring Book for Fans of

Apps threatens growth of coloring books publishers

Stress Anxiety Relief Coloring on the App Store