Are you sure you didn't mean you created a tool to help web developers create logos quickly? I'm a designer and I really can't see myself ever using this tool. I have Photoshop open at all times and know all the typefaces I have on my system, so I can bust out something incredibly simple in seconds. Plus, for logos, there's just not much benefit of using a web font since you typically won't use the same font from your logo elsewhere on the site, and the selection of good web fonts is limited and their kerning sucks and/or can't be adjusted at a precise level.

Just my 2 cents.

Edit: One more thing, designers don't create logos quickly. They're sweated over and tweaked and modified over and over until they're perfect. It's not something that we quickly generate or don't care about if there are small alignment/kerning issues. I'm sure there are some good use cases here but they don't immediately pop into my mind.