I’ve been steeped in comics for awhile now, but I remember a time when I struggled with grading. In the beginning I used to use e-bigs and I haven’t heard anyone talk about it in a while. With a lot of new collectors out there since Covid I thought I’d drop this link.
https://web.archive.org/web/20170315143823/http://www.e-bigs.net/freetool.php