Which linguistic product innovation first introduced widespread adaptive text prediction that learned from individual users' writing patterns?

Language technology has evolved dramatically over the past decade, changing how we interact with digital products. From basic spell-checkers to sophisticated natural language processing systems, the intersection of linguistics and product design has created tools that transform how we communicate. This trivia question focuses on a significant innovation in language product development that changed user experience across multiple platforms.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

SwiftKey's Neural Network keyboard (2016)
Google's Smart Compose in Gmail (2018)
Apple's QuickType keyboard (2014)
Grammarly's writing assistant (2015)