I'm slightly biased (as the creator of BlockStudio), but I think Scratch/Snap are basically graphical editors for textual code. They solve a different problem (

I'm slightly biased (as the creator of BlockStudio), but I think Scratch/Snap are basically graphical editors for textual code. They solve a different problem (preventing syntax errors) than what BlockStudio is aiming for: using an extension of Graphical Rewrite Rules for programming, with an emphasis on making it accessible to beginners.