Grammarly
San Francisco, CA
Last updated
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Grammarly launched in 2009, years before the current wave of generative AI, originally built around automated grammar and spell-checking technology that plugged directly into web browsers and word processors to catch writing errors in real time as users typed. The company has steadily layered generative AI features on top of that original grammar-checking foundation over the past several years, adding tone adjustment, full-sentence rewriting suggestions, and AI-generated drafting tools that go well beyond the product's original error-correction scope. Grammarly's browser extension and desktop app integrate directly into the writing surfaces people already use — email clients, Google Docs, Slack, and social media — rather than requiring users to copy text into a separate chatbot window, giving it a genuinely different, more ambient usage pattern than most competing AI writing tools. Grammarly's combination of over a decade of established grammar-checking credibility and its deep, ambient integration across users' existing writing tools has made it one of the most widely installed AI writing products in the world, even among users who don't think of it primarily as an "AI tool" at all.
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