Lex

Lex occupies a rare niche: an AI writing tool designed by writers, for writers. The interface is genuinely pleasant—clean, fast, and distraction-free. The AI integrations feel native, not bolted on. You can ask the AI to critique your argument, suggest counterarguments, or flag gaps—features that genuinely improve non-fiction writing. The ability to switch between GPT-4.1 and Claude 4 per document is a powerful flexibility, letting you choose the model best suited to the task (e.g., Claude for nuanced reasoning, GPT for creative brainstorming). Strengths: The 'Critique' mode is unparalleled—it argues against your draft like a sharp editor. 'What's missing?' works well for investor memos and academic arguments. Real-time collaboration is smooth, and sharing via link with no account required lowers friction. The team is responsive to feedback (email gets quick replies). Pricing is fair: $15/mo for Pro is competitive with ChatGPT Plus ($20) and Claude Pro ($20), and you get access to both models. Weaknesses: No native mobile app (though an iOS beta is rolling out to Pro users). Formatting is intentionally minimal—no tables, no footnotes, no advanced layout—so it's not a Word replacement for complex documents. Free-tier model usage is generous but finite; heavy users will hit limits. No built-in plagiarism check or SEO tools. Lex is a complement, not an all-in-one. Who it's for: Writers who value quality over speed. Journalists drafting long-form pieces, authors working on book chapters, founders writing investor updates, academics preparing commentary. Not for marketers cranking out SEO blog posts or teams needing heavy formatting. Bottom line: If you take writing seriously and want an AI that makes your work better (not faster), Lex is worth every penny of its $15/mo Pro tier. It's a premium tool for a specific purpose—and it excels at that purpose.

Lex is a browser-based word processor built around AI assistance. Its minimal interface—reminiscent of Medium—hides deep AI integration: select any sentence for critique, use keyboard shortcuts to continue your draft, chat with the AI about your text, or invoke inline suggestions via 'Ask Lex'. Documents support real-time collaboration with cursors, comments, and tracked changes (coming soon). Lex supports GPT-4.1, Claude 4 Opus & Sonnet, switchable per document. Features like Critique, 'What's missing?', and counterargument generation challenge your thinking—designed for essayists, journalists, and non-fiction writers who want a thoughtful collaborator, not a content mill. Lex was founded by a team with a journalism/publishing background. It prioritizes writing quality over SEO or viral content. Pricing is freemium: Free (unlimited docs, GPT-4 access, collaboration), Pro ($15/mo: higher limits, Claude access, priority speed), Teams (custom: workspaces, SSO). Over 300,000 writers use Lex.