Brewer's Friend does indeed provide a place to record actual results.
The Brew Session is where you record your actual volumes and gravities on brew day. That's one of the nice things (to me) about BF vs. BS. In BS your recipe is basically a one shot deal; you are expected to record the actual brew results in the same space as the recipe, and annoyingly, it defaults those values to irrelevant amounts, which confuses the heck out of me.
In BF, the recipe stands alone and you can brew it multiple times, recording actuals in each individual session. Each session also contains the efficiency stats for that individual brew attempt. And the Brew Log lets you put in dedicated entries for gravity samples along the way (partial attenuation), packaging, and tasting notes.