The hacking of macOS Mojave’s Light and Dark Modes continues. Today I found an app that allows you to run apps in Light Mode and Dark Mode side-by-side.
Gray is a simple little app that just enters a Terminal command that tells the system to run this app or that in Light or Dark Mode. There’s no altering of system files in any way.
So if you want to run Mail in Light Mode, and Notes in Dark Mode, Gray is your app. And it’s free!