Groupy could benefit from some attention in the display of text and icons in the title bar. In the current design, the Groupy icon on the left is barely seen, and the down arrow is completely invisible. To the right of the last tab, the "+" and the down arrow can't be seen. Also, tabs that are not currently in focus can't be read, with their icons being the only thing you can make out.
The software does have the option to alter the color of "unfocused" tabs, but this seems to do only with tabs of windows that are not in the forefront instead of the active window. Ideally, the color adjustment option should apply to unfocused tabs in the active window to improve their visibility.
Given that the title bar's color is determined by Windowblinds, it would be reasonable to expect a higher level of compatibility between the two apps. Are there any plans to address these issues?