I'm often annoyed with codepen.io (sorry codepen peeps; love ya though!). Looking for alternatives...
See also:
https://www.reddit.com/r/javascript/comments/c13c4t/what_are_some_of_the_alternatives_to_codepenio/
Flems
Interesting and uses unpkg.com for dependencies. Not sure how that works until I try it...
https://flems.io/
JSFiddle
It's grown a lot since the old days, but still feels a little back-woods to me.
https://jsfiddle.net/
CodeSandbox
This may become my new goto.
https://codesandbox.io/
rainbow9.org
Just noting it here because I miss it.
AWS Cloud9
This is more of a full-fledged development environment.
https://aws.amazon.com/cloud9/
https://console.aws.amazon.com/cloud9/home/product
Repl.it
I used this years ago when learning Scheme. Looks like it's evolved to include tutorials and a community feel.
https://repl.it/
Practice Board
New to me, but omg this looks like one of the originals!
https://www.practiceboard.com/
Outpan
Seems like a hot spot for me to publish quickie apps. Although I must say many of the apps here do not look like quickies. As their tagline says: awesome apps in your browser.
https://www.outpan.com/
Glitch
Collaborative development sandbox.
https://glitch.com/
Update 2020 June 29
Just saw this one here on dev.to. Nice work!!
https://dev.to/chr15m/i-built-an-online-code-editor-3aj5
Update 2020 May 18
Snack
I didn't know it was possible, but snack has iOS, Android, and browser previews for React Native code. e.g. This demo from Formik. Do other playgrounds have this option?
Look for more alternatives...
Several more alternatives nicely organized with pros, cons, and screenshots.
https://www.slant.co/options/5535/alternatives/~codepen-alternatives
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