"TikZ ist kein Zeichenprogramm" (German for "TikZ is not a drawing program"). :-)

An explanation for the name from the TikZ docs:

> TikZ’s name is intended to warn people that TikZ is not a program that you can use to draw graphics with your mouse or tablet. Rather, it is more like a “graphics language”.

While making the app I was worried that I was going against the TikZ philosophy. Maybe I should have named it "TikZ ist doch ein Zeichenprogramm" (TideZ)..