Wow no, it's not just the colors. Putting their front page and yours side by side the similarities are unmistakeable (nav position and style, button styles, use of centered line drawing on landing page, some of the copy). Whether it was intentional or not, I would change some things up to avoid confusing people and any legal implications that might have.
Sooo... basically they used Bootstrap like every other site?
The thing that's throwing you is the hand-drawn picture of a computer, like Dropbox has. Other than that, it looks like every other site that uses Bootstrap.
I'm sad you were down voted because I felt this was a Dropbox project, too. Especially with the graphic element. It DOES feel a little too familiar. If multiple people's opinions are to be rejected, well...
