Any solution to smooth line drawings, maybe converts to bezier?

A few weeks (?) ago I came across a website for drawing and sketching which smoothes everything. So instead of an oneven clearly hand drawn result, all lines become smooth. Maybe everything was converted to bezier curves or something. The result could be saved as a svg?

At that moment I did not see a use case. But now I think it is useful for drawing logo's by hand.

I think I saw it on HN, maybe even as a Show HN, but I am not sure and cannot find it. Maybe someone else knows?