[pedalpete]

Sorry to disagree, but I don't see where you're going that you think you're an 'email client killer'. Again, I would still need an email client for everything outside of comptify.

Neither of the apps you pointed to suggest they are killing email or email clients.

I'd suggest that if you're going to be a collaboration tool, focus on that. Note that Fleep is a messaging platform and front seems to be organized group emails. Neither of these guys are claiming to be a collaboration app.

What are you trying to do? Figure that out, and do it. But only one thing, or else the market is going to get confused as to what they are supposed to use your product for.