If you want to pare a concave surface square across a board's edge, the scrolled edge of a table apron for example, an in-cannel gouge is the tool: with the bevel ground inside the curve, it pares straight across just like a flat chisel. Two Cherries forges model 1481 in Germany with the steel and finish the brand is known for.
Thirteen widths from 6 to 30 mm, so the sweep matches the curve you are cutting.