Browser based editors and hosts for UI development

Plunker

• This is my default site.
• Has templates
• Supports multiple files.

CodePen

• Supports SASS, LESS, TypeScript and others.
• Doesn’t have files, but 4 panels
  • HTML
  • CSS
  • Script

jsfiddle

• Supports SCSS, CoffeeScript and others.
• Doesn’t have files, but 4 panels
  • HTML
  • CSS
  • Script
  • Starting to look dated.

Of these 3 sites, Plunker is on my high win, except for the TypeScript and LESS support failure.

CodePen’s support for LESS and TypeScript is a win for me. However to not being able to create multiple files to test templates and other features of angular and other files fails.