XT9 is a text predicting and correcting system for mobile devices with full keyboards rather than the 3x4 keypad on old phones. It was originally developed by Tegic Communications, now part of Nuance Communications. It was created for devices with styluses, but is now used for touch screen devices too. It is a successor to T9, a popular predictive text algorithm for mobile phones with only numeric pads.
- Engadget Article "XT9 takes predictive text entry to the Xtreme" (February 14th 2006).
- Nuance Communications press release Archived October 13, 2007, at the Wayback Machine. (2007).
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