Out of the box, Tk still looks like it's ten years old. None of those "good looking" applications really fit in with the host operating system's theme either; t

Out of the box, Tk still looks like it's ten years old. None of those "good looking" applications really fit in with the host operating system's theme either; they sort of fall into the uncanny valley of GUIs where they don't look like they're using an intentionally stylized custom theme, but they don't look native either. It's not just the theme that makes Tk seem like an antique; there are many commonly used widgets missing also. For example, I had difficulty making an editable listbox. I googled for a while and while other people had tried to implement it, most of the implementations were glitchy and didn't work the way you'd expect them to. Given the state of Tk right now, it can be easier to just whip up a GUI in Qt or GTK+. On the plus side, Tk does have excellent documentation.