The Newton had an SDK, a vibrant developer community, and a user interface that was one big touchscreen rather than having physical buttons - in 1993. Palm actu

The Newton had an SDK, a vibrant developer community, and a user interface that was one big touchscreen rather than having physical buttons - in 1993. Palm actually got its start selling software for the Newton, specifically their "Graffiti" recognition engine. If you want to argue about who had specific features first, Newton will usually win - PalmOS was stripped-down to be cheap and dependent on the PC it docked to whereas Newton was conceived as a standalone device so Newton could do things like print or send and receive a fax from day one - Palm got most of those features later if at all.