Inkscape is a vector graphics editor application. It is distributed under a free software license, the GNU GPL. Its stated goal is to become a powerful graphics tool while being fully compliant with the XML, SVG, and CSS standards.wikipedia:Inkscape
Tooltips unreadable with KDE Plasma
Under KDE's system settings go to colors > options and disable "Apply colors to non-QT-applications". Restart Inkscape if was running before the change.