[slantyyz]

I'm an ex-Mac user, and current Windows user. I'd say do Mac first. Mac users are accustomed to and way more likely to pay for apps.

Also, people are way more accustomed to buying apps on the Mac App Store than the Windows App Store, so discovery is definitely going to be an issue if you're going the App Store route.

On the Windows side, I pay for apps, but because prices tend to be higher for useful Windows apps, I tend to not buy as many.

When I was on Mac, I'd drop $10-15 on an app without blinking. For more expensive apps on the App store, it was also an easy decision because a $50 app could be installed on multiple machines.

In general, the useful apps on Windows aren't on the App store don't have the liberal licensing that Mac App store apps do. Because I want to run my stuff on at least two machines (desktop and laptop), and because usually there's some DRM that binds a license to one machine, I am much more hesitant about buying licenses.

[johnmax]

Thanks a lot for your feedback - eventually, if it is successful, I would launch it for all possible platforms.

So, getting to paying users is not a priority for me at the beginning.

Getting to heavy users definitely is, and discoverability may be better on the Apple App Store I guess, though eventually I would like the product to be so good, that it also gets word-of-mouth attention.

[ekovarski]

Agree with slantyyz... go for the Mac users first. The users tend to be more vested in the apps and you can get good feedback going. Going for a larger audience is not always the best approach especially if you are testing the waters.