Developers should choose the Ruby API if they want to build tools that run inside SketchUp, and the SketchUp C SDK if they want to process files outside of SketchUp.
The choice between the SketchUp Ruby API and the SketchUp C SDK is entirely dictated by where your code executes and what it needs to accomplish. The two tools do not directly compete; they serve completely different environments. Direct Comparison Overview New developer guidance – GUI extension – SketchUp Forum
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