Lex
Lex (spun out of Every) · Productivity
Lex is an AI word processor that pairs a clean writing canvas with inline AI editing, chat, and style tools so you can draft and revise in one place.
About Lex
What Is Lex
Lex is an AI word processor and online document editor built for people who want AI help while they write, not bolted on after. It came out of Every in late 2022 and now serves more than 300,000 writers. The pitch is simple. You get a distraction-free editor, and a handful of AI tools sit right next to your text.
As an AI writing editor and AI proofreading tool, Lex keeps editing at the center. Its Checks feature highlights line-level suggestions inside your document, so you keep control of the wording instead of pasting in generic AI output. Ask Lex opens a chat panel for brainstorming, research, and rewrites. Because it runs on models from OpenAI, Anthropic, and TogetherAI through enterprise APIs, your drafts aren't used to train those models.
The main catch is the free tier. It caps AI messages, Checks, and saved prompts per month, so heavy writers hit the wall quickly and moving to Lex Pro becomes the practical step. There's no desktop app either. Lex runs in a browser, with a companion iOS app on the paid plan.
Getting Started
- Sign up at lex.page with an email or a one-click login, then create a blank document or start from a template.
- Type your draft on the minimalist canvas. Hit the AI shortcuts when you want a suggestion, a title idea, or a full rewrite of a selection.
- Open Ask Lex to chat with a model about your document, or run Checks to get line-level edits highlighted in place.
- Save reusable prompts and knowledge bases so the AI carries your tone and background facts into every future draft.
- Share a read-only link to publish, or invite collaborators to edit together in real time.
Product Information
A quick look at Lex's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Professional writers
- Students and academics
- Marketing and content teams
- Non-native English writers
Tasks
- Line-level editing and proofreading
- Brainstorming and research
- Rewriting and rephrasing
- Drafting with reusable prompts
Scenarios
- Polishing a draft you already wrote
- Co-writing with a teammate
- Writing on the move
- Turning notes into a publishable piece
Key features
Ask Lex Chat
A chat panel sits beside your document so you can ask questions, brainstorm angles, or request a rewrite of any selection. It handles the exploratory part of writing, and you can upload files for extra context. Custom prompts and a built-in prompt library speed up the questions you ask most.
Checks
Checks scan your draft and highlight line-level suggestions directly in the text. You review each one and keep or dismiss it. The feature targets grammar, clarity, and tone, which is why it feels closer to an editor than a generator.
Style Guides and Knowledge Bases
Style guides keep the AI aligned with a specific voice or set of rules. Knowledge bases give the assistant persistent background facts, so the suggestions stay relevant across documents instead of drifting generic. Both matter for teams that need consistency.
Versions and Version Control
Lex saves your document history, so you can scrub back and restore an earlier version. Named save points let you mark a draft you're happy with before you experiment with a new direction.
Live Collaboration and Publishing
Share a link and collaborators can join with a single login and edit in real time on the free plan. When a piece is ready, publish a read-only link so others can read it without an account.
AI Commands and Title Ideas
Keyboard shortcuts apply quick AI actions to a selection, from finding a better word to generating a list of ideas. Title Ideas returns a batch of headline options in one click, handy when you're stuck on the top of the page.
Formatting Tools and Exports
A formatting toolbar covers headings, lists, and emphasis, and the editor exports clean files to Markdown, PDF, and Word. That makes it easy to move a finished draft into another publishing workflow.
Developer API
Lex offers a simple API documented at docs.lex.page. It lets developers connect the writing workflow to other tools, but most individual writers won't need it.
Pros and cons
Pros
- The edit-first design keeps you in control of your words, since Checks suggest changes instead of overwriting your draft.
- A single workspace combines drafting, AI chat, and revision, so you stop switching between a document and a separate chatbot.
- Live collaboration and read-only publishing links are free, which lowers the cost for teams already sharing drafts.
- Custom prompts and knowledge bases carry your tone and facts into every new document, cutting repetitive setup.
- Drafts run through enterprise APIs and aren't used to train the underlying models.
Cons
- The free plan limits AI messages, Checks, and saved prompts each month, so regular writers will likely need Lex Pro.
- There's no desktop app, which means people who want a native Mac or Windows client have to use a browser.
- Premium models sit behind the Pro paywall, so the strongest AI help isn't in the free tier.
- It's not a full replacement for a heavy word processor, since advanced layout and typesetting features are limited.
Frequently asked questions
Lex is an AI word processor and collaborative writing app that handles drafting, editing, and revising in one place. Writers use it for fiction, newsletters, essays, marketing copy, and any document that goes through a real edit process.
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