Setting up new project locally just for quick ideas and snippets usually is a bit of overkill, since it takes time to set up, requires use of many tools (like editor, browser and terminal) and you end up with extra files in your machine.

That's where online code sandboxes come in. These requires no setup, includes all tools for tests/preview in single space and allow to quickly get rid of your snippets with just of a press of a button.

For a long time I used a combination of jsbin.com and codepen.io, recently moved to codesandbox.io and never really looked back.

What is your current favorite online code sandbox and why?