When comparing Plunker vs Codeply, the Slant community recommends Codeply for most people. In the question“What are the best web development playgrounds?” Codeply is ranked 8th while Plunker is ranked 9th. The most important reason people chose Codeply is:
Bootstrap, Foundation, Materialize, Pure CSS, Skeleton, Semantic can all be referenced simply.
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Pros
Pro Test actual HTML files
You can sandbox your actual html files with a head section, script tags, etc.
Pro Fill size preview
Can open in a fill-sized web page like preview.
Pro Multiple files and file structure
You can simulate actual website structure allowing you to sandbox multiple file situations such as Angular rather than just a single concept such as "how do I make this div work better."
Pro Responsive frameworks included
Bootstrap, Foundation, Materialize, Pure CSS, Skeleton, Semantic can all be referenced simply.
Pro Responsive preview
Test different screen widths and standard viewports.
Pro Snippets in editor
Grab code snippets right from the editor UI.
Pro Free
Cons
Con Outdated and confusing UI
Con Private and upgrades not available
One time donation unlocks Private Ply's.