Lex

Lex is a collaborative AI writing editor for drafting, revising, and sharing documents in the browser. It supports feedback, rewriting, version history, and team collaboration for writing that needs editing before it is finished.

AI Team Collaboration AI Documents Assistant

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Overview

Lex is a collaborative document editor with built-in AI tools for drafting, editing, and review. It combines document writing, comments, versions, and sharing features with AI assistance that can rewrite text, generate ideas, and provide feedback inside the document.

The product is aimed at people whose writing goes through an edit process and need a focused workspace for content that must be refined before publishing or sharing. The site highlights use for academic papers, customer-facing copy, important emails, and fiction drafts, and it also supports sharing with collaborators through browser-based links.

Key features

AI feedback and rewriting

Ask the AI for feedback on a draft, brainstorm ideas, or rewrite text directly in the document.

Checks

Use line-level suggestions that are highlighted in your document for more targeted editing.

Style guides and prompts

Train Lex to draft and edit in your voice with style guides and custom prompts.

Version control

Save and restore previous versions, including manual named save points and rewindable history.

Live collaboration and publishing

Share a link so others can collaborate in the browser, or send a read-only link for review.

Keyboard-driven AI commands

Use AI shortcuts to find better words, generate ideas, and create title suggestions faster.

Common use cases

Long-form writing and revisions
Draft papers or articles in a workspace where you can get AI feedback, refine wording, and keep version history as you revise.
Editing polished business writing
Work on copy that needs to be polished before sending, including customer-facing text and important emails.
Collaborative document review
Share a document with teammates or collaborators and work in the browser using link-based access.
Prompted writing workflows
Store guidance in style guides, prompts, or knowledge bases so the AI can respond with more context about your project or voice.
Faster drafting
Use saved prompts, title ideas, and keyboard shortcuts to move quickly from rough draft to a cleaner version.

Pros and Cons

Pros

Combines collaborative documents with AI editing tools in one workspace.
Supports feedback, rewriting, versioning, comments, and publishing in the same product.
Allows browser-based collaboration through shareable links without requiring an app download.
Offers style guides, prompts, and AI model choice for more tailored writing help.
States that writing is privately hosted, with no training on customer writing and limited team access to data.

Cons

Track Changes is listed as coming soon rather than fully available.
The pricing page does not publish exact free-tier limits for Ask Lex, Checks, or custom prompts.
Integration details are limited in the provided source set, aside from a documented Kit integration mentioned on the about page.

FAQ

Can teams use Lex together?

Lex offers a free way to collaborate on documents, and the pricing page says team collaboration is free on shared documents. For heavier collaboration, Lex Teams adds unlimited group use of Lex folders.

Is there a team plan?

The pricing page says Lex supports sharing and collaboration on documents for free, and Lex Teams is available for people doing a lot of collaborative work.

What are the limits on free accounts?

Lex says its free users have limits for Ask Lex messages, Checks, and custom prompts, but the pricing page does not list the exact numbers.

Is my writing private?

Lex says it is not training language models and has no immediate plans to do so. It also says writing is privately and securely hosted on Lex’s own database, with team access allowed only in limited cases and with permission.

What kind of writing is Lex designed for?

Lex says it is built for writing that goes through an edit process, such as academic papers, customer-facing copy, important emails, and fiction drafts.