Holy crap does the site's landing page look like Simple.

I don't think these are the only two sites using a big hero image overlaid with white Gotham/Lato/Proxima Nova headers...

It instantly reminded me of simple as well. Both top fixed headers with orange buttons and large BG image with a white background. There are more for sure. The basic app/tool website layout.

Both sites use twitter bootstrap with a few font changes, among other things.

Didn't mean to come off so accusatory. I had simple open in another tab at the time and thought it was weird that the sign in link had changed text before I realized what was going on :)