I've seen an interesting demo a few weeks ago for calling GTK directly from CL without binding/libraries: (load "./demostuff") (defun gtkapp ()

I've seen an interesting demo a few weeks ago for calling GTK directly from CL without binding/libraries: (load "./demostuff") (defun gtkapp () (sb-int:set-floating-point-modes :traps '(:overflow :invalid)) (gapp testgtk (window win testgtk "Test" 400 200) (box v outerbox1 win) (box v mainbox1 outerbox1) (box h buttons1 mainbox1) (box h numbox1 mainbox1) (box h leftbuttons1 buttons1) (text num1 "Press the OK button." numbox1) (button b1nw "OK" leftbuttons1 (xtext num1 "Button pressed.")) (gtk_widget_show_all win)) (g_application_run testgtk 0 nil) (g_object_unref testgtk)) This is enough to create a window with a button and a text object, in less than 20 lines. The "demostuff" part contains a few function and macros that are used in the author's demo. The zip archive distributed in his GitHub page[0] also contains a dumped SBCL image at around 40 MB and a script to build it for people who want to try it without installing SBCL. Not small in absolute terms but, even without function tree-shaking, its size can be reduced with core compression to a little more than 10 MB (12MB on my Debian installation, your SBCL needs to be built with "--with-sb-core-compression"), anyway still an order of magnitude smaller than Electron... ^__^; [0] https://github.com/mifpasoti/Gtk-Demos https://github.com/mifpasoti/Gtk-Demos