Not really! CustomFit creates custom patterns, and that means the site will require you to save both measurements, and a gauge, before creating a pattern.
If you don't want to take a full set of measurements, start by copying measurements over from the CYCA standards and tweaking them a bit, or begin with only the Essential measurements. (You can learn more about taking your own measurements via these YouTube videos.)
I think one of the coolest things about CustomFit is that the pattern is written to your specific gauge, rather than the traditional way of you matching the designer's gauge. Learn more about swatching "predictively" by clicking here.