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We share a similar vision at Tonic that code snippets should be completely runnable. With Tonic embeds ( https://tonicdev.com/embed ) your code is automatically connected to every version of every one of the 300,000 library on npm (just require("library") or require("library@version"), its already pre-installed). Additionally, the code is run in an actual container, so you can use filesystem examples, spin up a web server, whatever you'd like:

1. Example that spins up an express server in the example you can actually hit: http://blog.tonicdev.com/2016/03/09/snapshots.html

2. A blog post I wrote about hacking JSX with many runnable examples: http://tolmasky.com/2016/03/24/generalizing-jsx/

3. Node's fs docs with the examples converted to embed: http://capicue.com/fs.html

Good to see Tonic Dev is still alive, not sure what you guys are doing though because there have been no new features/fixes for as long as I can remember and performance and bugs are still bad and highly visible.

For other people: Is there anything like Tonic Dev (notebook kind of thing) that runs locally? I want to love Tonic but without offline support, that will never happen...

Lots of stuff in the pipeline, any specific feature requests in particular? With regard to performance, are you by chance using Firefox? We have some known issues there.

Check out jupyter. It hosts a variety of runtimes including JavaScript and has tons of other goodies like an interactive debugger and graphing. Very powerful.

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