If you find yourself reading code on GitHub a lot, or cloning repos to open and read in your editor, you'll find Sourcegraph useful. If not, then you probably won't find it useful yet, but you might like our Chrome extension, which adds these features inline on GitHub.com (https://chrome.google.com/webstore/detail/sourcegraph-for-gi...).
We'd love feedback. Try hovering over some tokens at https://sourcegraph.com/github.com/sourcegraph/checkup@maste..., for example. Click on the smiley in the bottom right to give feedback.
Huge thanks to the VS Code team for building an amazing and extensible open-source code editor that we can build on.