Lex AI

Lex is a collaborative document editor from Lex, Inc. that builds AI writing assistance directly into a word processor rather than as a separate plugin or sidebar tool. Typing +++ anywhere in a document triggers AI-generated continuation based on the surrounding context, and a Command+K command bar lets writers generate content, create lists, or restructure headings without leaving the page. An AI Feedback feature can comment on a draft, help brainstorm ideas, or rewrite passages, while a set of AI Checks flags issues with grammar, brevity, cliches, readability, passive voice, and confidence in the text, each shown inline with a one-click fix or explanation. Beyond the AI layer, Lex supports real-time collaboration, comments, version history for comparing alternative phrasings, and publishing documents as read-only links, and it works from a browser on both desktop and mobile without requiring an app download. The company says it serves over 300,000 writers, including employees at companies such as Google, Microsoft, Dropbox, and Stripe, and outlets including BuzzFeed and The New York Times. Lex is built for writers and content teams who want AI assistance woven into everyday drafting and editing rather than a standalone chatbot. Track Changes was listed as a coming-soon feature, so it was not yet available when this description was written, and detailed pricing tiers are covered on a separate pricing page.