You can browse your bookmarks/articles from web, browser extension and Android app. Not only Mac App. It syncs with all your devices. In near future we release iOS (iPhone/iPad) app, Windows, Linux client and also API.

In addition, you can get personal RSS feed of your bookmarks and read in your favorite RSS reader.

Ah! Ok, you got me fooled with the title: _Mac app_ for bookmarking and read it later.

And the site doesn't help too much either...

Seems like the mac app is the new thing that he's trying to show off.

He probably thought his audience was existing users, but it may have been better to write to users who have never seen the app.