but I think the biggest differentiator is that their coding playgrounds are right in the browser
To be fair, this isn't really a big differentiator nowadays. Lots of platforms have that feature (e.g., Codeacademy and Scrimba, to name two).
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To be fair, this isn't really a big differentiator nowadays. Lots of platforms have that feature (e.g., Codeacademy and Scrimba, to name two).