Sketch Styler
Styler assigns styles automatically to all of your unstyled
Screenshots

Hunter's comment
Styler scans your Sketch files for unstyled layers and looks which of the existing styles (in the file or in linked libraries) matches for them
if you are a sketch type of frontend mockup designer then your probably gonna love this tool, kinda great for an optimizing geek that wants to minimize bloat and product swell -- Consistency everywhere ftw.
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