* Markdown support
* Built on Git
and non-programmers have no idea what these are and why they should care. You should probably do some user testing with non-programmers to figure out what claims are relevant on your front page.
EDIT: pricing is confusing as well. It says "Plans can be paid monthly or annually.", but the paying plans mention that they have to be "(paid annually)" which does not make sense. Can you clarify ? So can you actually pay per month or do you have to pay per year ?
Additionally, what is the license for public projects ? GitHub makes it clear that they have to be open-source. How about on Penflip ? Can they be open, while retain a copyright license ?
Also, why don't you have some intermediate plans ? Imagine I'm writing a book, having the 8 dollars plan for 50 projects seems completely overkill, I'd probably want a plan in there with 2 to 5 project or something like that. 50 seems like a company/organization plan.
And it's not clear what "premium support" means in the pricing, nor why we should care about it.
This being said, it's a good project, but I see many ways you could improve on how you communicate around it.