[ytpete]

You can open dev tools on either of these editors, but in both cases you're not making permanent changes to the source that will stick around the next time you launch the app.

Hacking the minified source isn't going to be fun no matter what, but if you clone Brackets from git the original LESS files are very easy to modify. Or you could just write a three line extension (https://github.com/adobe/brackets/wiki/Customize-Your-Code-F...) to adjust the CSS without modifying the core at all. That flexibility is the advantage of building on the web tech stack (an advantage shared by Brackets, Light Table, and Atom alike).