Author here. I chose tkinter because it's included in Python, or so I thought. I wanted to minimize the complexity of installation.
The README lists alternatives and why I find them insufficient. Okular allows free-hand annotations, but not saving those for later use. It allows inserting custom saved stamps, but these will not be visible in other PDF readers.
The README lists alternatives and why I find them insufficient. Okular allows free-hand annotations, but not saving those for later use. It allows inserting custom saved stamps, but these will not be visible in other PDF readers.