Brilliant concept, as I've been struggling with this exact problem for a while. A few comments:
Details on how you decide a fund rating would be nice.
The "Forecasts that drive our models" doesn't tell me what's really going on. First item: "US Small Cap vs Large". So you're biased toward small cap? That's the implication, but it's not explicit. I'd like to read why. Also, two of the three listed items talk about international (without any explanation), yet my specific plan recommendation has just a sliver of international exposure despite several options in that regard.
Usability: after finding my company's plan and creating an account, if I click on "401k guidance" in the top nav, I don't expect it to show the search field to find other company plans. Rather, I expect it to show me my plan(s). (I see it's under My Stuff, but that's less obvious.)
Very good start!