FretTool - Fretboard diagrams for guitar, bass, ukulele. Chords, scales

I am a guitar teacher and draw a lot of chord and scale diagrams for my students. I was never satisfied with the available online tools. Whether they are paid, or limited, or incomplete. I just needed a fretboard, put points in the proper position, sometimes with names of notes, of finger numbers, maybe a short description. A few extra colors and alternative square, triangle points, that's it. With my son, Robin, we developed a tool that does all that is needed, quick, simple, and exports nicely to pdf file. No paying (unless you wanna), no limits, just everything handy.