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

Developer behind Repix and Relook photography apps turns its attention to stressed-out smartphone and tablet users

The Best Adult Coloring Apps (Including Free!) - DIY Candy

Coloring Book for Adults App by App Labs

Disney launches its own adult coloring book app

The Best Adult Coloring Apps (Including Free!) - DIY Candy

Coloring Book for Adults. on the App Store

I tried a bunch of coloring apps, and they all miss the point - The Verge

Pigment review: the first coloring book app to get it right

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Adult Coloring Book Apps : coloring book app