Tkinter provides only a small number of basic widgets and lacks a collection of modern widgets. It needs Ttk, Pmw, TIX, and other extensions to provide some really useful widgets. Even with these extensions, Tkinter fails to match the range of widgets provided by other GUI tools, such as the advanced wxPython widget set and PyQt.

For instance, wxPython's HtmlWindow widget lets users display HTML content with ease. There have been attempts to provide similar extensions in Tkinter, but they are far from satisfactory. Similarly, there are other widgets from the Advanced User Interface Library and mixins in wxPython, such as floating/docking frames and perspective loading and saving; Tkinter users can only hope that these widgets will be included in future releases.