When compared to InvisionApp, which is what I use currently for sharing mocks and annotations capability - they have more features and for the same/similar price. You won't beat them in features (atm) so you gotta beat them in price. If you guys are cheaper, I'd give it a whirl!
Hi Jimmy, we've since simplified pricing so there are now only two options - https://www.draftapp.co/plans
For an individual there is a Solo plan at $10 per month. This gets you 5 projects, unlimited storage.
For teams there is a Team plan at $25 per month. This gets you unlimited projects, unlimited storage.