Oh, come on, there must be something you've used from their website or perhaps something that was used both by you and by them, taken from another place. Just take a looks at the Logic and Registration button and tell me they aren't remarkably similar, especially when it comes to colors:


Here's something important you should realize. This market is highly competitive, so becoming successful is not going to be easy. Building up the reputation, however, is a necessary (but not sufficient) condition of that happening. And if people see the similarities you can't pretend like they're seeing something which is not there. Oh, and here's the trick I've learned for these kinds of situations: taking a look at the ToS of the companies. It's just an extraordinary coincidence that the first 9 points are the same on both websites?