As tablets become the preferred digital reading device, every publisher out there is creating their own iPad apps. And soon they will have to create Android apps and maybe RIM Playbook apps and HP WebOS apps too. Or they can keep on publishing on the Web and display their websites differently to people who visit them via tablet browsers. OnSwipe is a new digital publishing tools company that wants to make mobile browsing as swipe-friendly as a tablet app. The startup will be showing its software today at TechStars NYC Demo Day. I got a preview from co-founders Jason Baptiste and Andres Barreto when I visited the TechStars New York office last week (see video above). They are setting out to prove that the browser is the only app you'll need.