SketchBook hasn’t been out that long, but it’s already a pretty popular app in the BlackBerry 10 community. When it was first released, users begged for compatibility on the Classic and Q10.

ReFocus Technologies has granted that request with a new update that adds support for those two smart phones.

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The update also adds a couple new features: image overlay and undo.

If you haven’t already, you can download SketchBook from BlackBerry World for $1.99