Lex
What is Lex?
Lex is a collaborative AI writing editor for writers and marketing teams that helps draft, revise, and tighten copy inside a minimalist document. It combines AI Feedback, Comments, Versions, Knowledge Bases, and a Prompt Library so the assistant can work from your voice and context. Lex is used by teams at Berkeley, Canva, Dropbox, and Google. Lex Pro costs $14.99/month.
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At a glance
- Lex is best for writers and marketing teams who want AI help inside a collaborative document editor.
- Lex Pro $14.99/mo
What does Lex do?
Lex turns drafting into a collaborative editing workflow: you write in a minimalist document, then use AI Feedback, Comments, and Commands to tighten wording, surface alternatives, and keep momentum without leaving the page. It also layers in Checks, Style Guides, Knowledge Bases, and a Prompt Library so the assistant can adapt to your voice and the context of the document instead of giving generic rewrites. The product is built for sustained writing work, not one-off prompts. Lex says it is loved by over 300,000 marketers, and its public examples include teams and people at Berkeley, BuzzFeed, Canva, Dropbox, FT, Google, Harvard, Kit, Microsoft, NYT, Reddit, Stanford, Stripe, and Yale. The site also points to more than 200 drafts moved into Lex by one user, plus a simple API and an iOS app in the product roadmap. Collaboration is free on documents, and the app is designed to help writers keep editing, versioning, and revising in one place.
Why use Lex?
- Its inline editing flow keeps AI suggestions inside the document, so writers can revise without breaking focus.
- Style Guides and Knowledge Bases let teams steer output toward a consistent voice and shared context.
- Version history and Rewind make it easier to recover earlier drafts and compare changes as writing evolves.
- Free document sharing lowers the friction for collaborative editing before teams add more structured folder workflows.
- The simple API and Kit integration give it a path into newsletter and workflow automation without a heavy setup.
Who is Lex for?
- Content marketers who need faster drafting and cleaner revisions in one workspace.
- Editors who want line-level suggestions without switching between separate tools.
- Founders and operators who need polished emails, docs, and internal writing.
- Academic writers who want help refining papers while preserving their own voice.
- Newsletter writers who want AI-assisted drafting tied to their publishing workflow.
What are Lex's key features?
AI Feedback
Get AI comments on drafts to flag weak phrasing and suggest edits, helping teams refine copy faster across more than 200 drafts.
Comments
Leave threaded comments on writing for review and approval, so teams can discuss edits in one place instead of scattered email threads.
Versions
Save and compare draft versions to track how a piece changes over time, which helps writers recover earlier wording and review revisions.
Mobile Web
Write and edit from mobile web, keeping drafts accessible on the go for teams that need to update copy outside desktop workflows.
Live Collaboration
Work in the same document at once with live collaboration, reducing back-and-forth for teams at Berkeley, Canva, and Dropbox.
Publishing
Publish finished writing directly from Lex, giving teams a clear path from draft to live content without moving between tools.
Knowledge Bases
Store reference material in knowledge bases so AI can use approved context while drafting, which helps keep output aligned with team source material.
Prompt Library
Reuse saved prompts from the prompt library to standardize writing tasks and speed up repeat work across teams like Google and Stripe.
What does Lex integrate with?
- Kit
What are Lex's use cases?
Content drafting for marketers
Content marketers use Lex to move from rough ideas to cleaner drafts in one workspace, using AI Feedback to tighten structure and wording before publishing. They can keep iterations organized with Versions, so campaign copy, landing pages, and blog posts stay easy to revise.
Line edits for editors
Editors use Lex to review drafts line by line without bouncing between separate tools, using Comments to leave precise notes and Track Changes to manage revisions. That makes it easier to return polished copy to writers while preserving the original intent.
Founder writing workflow
Founders and operators use Lex to draft polished emails, docs, and internal updates faster, leaning on Commands and Style Guides to keep tone consistent. Knowledge Bases help them pull in company context so recurring writing stays accurate and on-brand.
Newsletter publishing workflow
Newsletter writers use Lex to draft, refine, and publish issues in one flow, using Publishing and Prompt Library to speed up repeatable newsletter work. Live Collaboration helps them coordinate edits with teammates before sending.
How does Lex work?
- Start by opening a new document and adding your first draft, then use AI Feedback to get immediate suggestions on clarity, structure, and tone.
- Refine the text with Comments, Track Changes, and Versions so every edit stays visible and you can compare drafts without losing earlier work.
- Bring in your team with Live Collaboration to edit together in real time, or use Mobile Web to keep working when you are away from your desk.
- Organize repeatable writing with Knowledge Bases, Style Guides, and Prompt Library, then use Publishing to move finished work into your publishing workflow.
How much does Lex cost?
Lex Pro
$14.99/month- AI models (e.g. GPT-5, Claude 4.1 Opus, etc)
- $30 of included monthly AI credits
- Money-back guarantee
- Priority support via email
- Early access to new features
Frequently asked questions
What is Lex?
Lex is a collaborative AI writing editor for writers and marketing teams that helps draft, revise, and tighten copy inside a minimalist document. It combines AI Feedback, Comments, Versions, Knowledge Bases, and a Prompt Library so the assistant can work from your voice and context. Lex is used by teams at Berkeley, Canva, Dropbox, and Google. Lex Pro costs $14.99/month.
How much does Lex cost? Is it free?
Lex starts at Lex Pro at $14.99/month.
What is Lex used for? Who is it for?
Lex is used for AI Feedback, Comments, and Versions. It's built for Content marketers, Editors, and Founders and operators.
Does Lex have an API and what does it integrate with?
Lex doesn't publish a public API. It integrates with Kit.
Editor's read
Check whether Lex Pro's $14.99/month plan covers your expected AI usage, since it includes $30 of monthly AI credits and premium model access. If your drafting volume is high, verify how quickly those credits would be consumed before committing.
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