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Unix/Mac: Unix Build Status    Windows: Windows Build Status

Seeing Is Believing

Evaluates Ruby code, recording the results of each line. Integrates with any extensible editor (I've integrated it with many already, see the list). If you like Swift Playgrounds, you'll like SiB.


Helpful links


  • Watch a longer video.
  • Watch John Cinnamond use it in a presentation at the 10:22 minute mark.
  • Avdi uses it in Ruby Tapas, an amazing resource for developers in general and Ruby Developers in particular!

Known Issues

  • Assumes utf-8 everywhere. If this is an issue, please see the encodings section of the wiki.


Shout outs

  • Whitequark for all the work on Parser, which dramatically dramatically improved SiB (I used to have my own horribly shitty line-based parser)
  • Travis CI... I love you times a million! So many difficult bugs have been caught by this. It's so easy to work with, astoundingly convenient, helps me guarantee that SiB works on everyone else's computers, too. And it's free since SiB is open source. I literally have a Travis CI sticker on my laptop, I love you that much.



Copyright (C) 2014 Josh Cheek <>

This program is free software. It comes without any warranty,
to the extent permitted by applicable law.
You can redistribute it and/or modify it under the terms of the
Do What The Fuck You Want To Public License,
Version 2, as published by Sam Hocevar.
See for more details.
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