Not a Clue

I have no idea how they were abble to obtain ANY of their examples. Outline WITH colors, impossible!
The sketch efects listed on the right were mostly solid black or solid white. At best, a few had tiny wisps of line segments.
3 “sketch” effects at the bottom of the list did do something, but they were preset and unable to customize them with the effects on the left, nor alter the intensity of their effect.
As such, the effects on the left did nearly nothing unless you were messing with the original “normal” image. Even then, all the effects on the left were very generic, many sliders had no effect; didn’t work.
I used a variety of images (all jpegs), light, dark, color, B&W….Nothing!

Here, you get everything you pay for.
I’m wondering how much they paid for the 5-stars in 50+ comments.
I’ve been doing consumer art since Commodre 64.

Conclusion:
Not one effect or combination of effects and “sketches” here is capable of creating any kind of “sketch” unless you create your art on drugs. Very useless efects found on any $15 mobile phone…. no, wait… most of the effects on those phones actually work.

Aryu Gaetu about uSketch, v1.0