Which innovative product design feature first introduced widespread natural language processing for consumers?

The field of language technology has revolutionized how we interact with digital products. From simple spell-checkers to sophisticated language models, product development in linguistics has seen remarkable advancements. This trivia question focuses on a pivotal development in language product design that changed how we interact with our devices daily. Test your knowledge of how linguistics and product development intersect in the digital age!

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Apple's Siri (2011)
Google Translate mobile app (2008)
Microsoft's Clippy assistant (1997)
Amazon's first Kindle text-to-speech (2007)