My Mac application (free while still in beta) is downloaded by about 60%. Visitors are mostly Google users looking for that kind of application. (Visitors: 1.5k/mo) I'm really surprised by those numbers, would have never guessed they'd be that high. While starting with your project, only the people that are really keen to use it find the way to you website. So I'm expecting decreasing download rates once my application gets more traction.
Yes, I'm convinced a lot more visitors are possible. I'm intentionally reluctant doing too much marketing now as I'm in beta and that means there are bugs in the application I want to sort out first. The feedback of the people who have found my application is invaluable, though. (And I'm earning my daily bread as a SEO consultant right now, so SEO is definitely way up on my marketing cheat sheet. g)
almost 50% web site visitors downloading your app?
OMG It's a fantastic number!
Where visitors come from? Cause if you can maintain that ratio with visitors coming from paid campaigns (google ads, facebook ads...) you will have a very low cac (user cost of acquisition)