I'm genuinely curious because (1) it doesn't seem to be presented in their FAQ nor on-site and (2) the WHOIS info for namegrep.com is private.
While this isn't a huge red flag, it is a little suspicious that I could be handing over my branding strategies (if one could call regexps "strategies) to some unknown 3rd party.
(FWIW, I built a similar tool, but I don't go to any lengths to hide my involvement)
EDIT: removed link to my similar tool, wasn't intending to hijack any clicks, but rather get the discussion going on whether its important to you as a user of this tool to know who you're dealing with