Oba draws inside AutoCAD, and reads its work back.

Ask in plain words. Oba draws it in the drawing you have open, measures what it drew, and tells you in millimetres.

Oba is invitation only right now. Request one here.

An example. This is the Oba window itself, at the width it opens at, with a stand-in behind it that draws nothing and says so.

What it does

It draws where you already work.

It asks before it guesses.

It measures what it drew and tells you.

AutoCAD is the one you can use today. The other four are built and waiting on a release.