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Content & Writing

Lex

Lex is a collaborative document tool designed for note-taking and writing that integrates AI editing capabilities directly within its interface. It supports a range of writing workflows from quick notes to complex documents, offering AI assistance for feedback, brainstorming, rewriting, and editing through inline comments called Ask Lex. The platform enables real-time collaboration via shareable links without requiring app downloads, and includes features such as keyboard navigation and version control within a minimalist interface. Lex also allows users to customize AI behavior through style guides trained to a user's voice and persistent knowledge bases for personalized assistance.

Updated Jan 8, 2026freemium
Visit Lex ↗Visual Guide
Overview

Lex is a collaborative AI-powered writing tool that combines note-taking, editing, and real-time collaboration in a minimalist interface.

Pricing
Free
Category
Content & Writing
Company
Visual Guide
Interactive PresentationOpen Fullscreen ↗
Key Features
01
Interact with selected AI models to discuss and improve writing content within the document.
02
Receive line-level AI suggestions highlighted directly in the document for editing and refinement.
03
Train Lex to draft and edit documents in a specific voice tailored to the user's style.
04
Provide persistent background knowledge to the AI to generate relevant and context-aware suggestions.
05
Access a collection of user-contributed and default prompts, and create custom prompts for various writing tasks.
06
Track changes and revisions within documents to manage edits over time.
07
Share links for real-time document editing without requiring collaborators to download an app.
Real-World Use Cases

Note-taking and Drafting

Users create documents ranging from quick notes to complex papers with AI assistance for brainstorming and editing.

Collaborative Writing

Teams share documents via links to edit in real-time with AI-powered feedback integrated directly in the workflow.

Personalized Writing Style

Writers train style guides to ensure AI drafts and edits match their unique voice and tone.

Quick Start
1
Create an Account
Visit https://lex.page and sign up to unlock writing features.
2
Start a Document
Create a new document for notes or drafts within the platform.
3
Use AI Assistance
Add inline Ask Lex comments to get AI feedback, rewriting, or brainstorming help.
4
Apply AI Checks and Chat
Use line-level AI suggestions with Checks or interact with AI models via Chat for content improvement.
5
Collaborate
Share a link to your document for real-time editing with others without requiring app downloads.
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Strategic Context for Lex

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Pricing
Model: freemium
Free
Free
  • Limited AI messages via Ask Lex
  • Limited AI Checks
  • Limited custom prompts
Lex Pro
Details in Pricing FAQ (not specified)
  • Expanded AI usage limits
  • Additional features for individual users
Lex Teams
Details in Pricing FAQ (not specified)
  • Collaborative features for organizations

AI usage is tracked via token-based processing which affects message and feature limits.

Assessment
Strengths
  • Minimalist interface with keyboard shortcuts for efficient navigation
  • Inline AI editing reduces the need for external tools
  • Real-time collaboration via shareable links without requiring app downloads
  • Customizable AI through style guides, knowledge bases, and prompt libraries
  • Supports a wide range of document complexity from quick notes to detailed papers
Limitations
  • Free tier imposes limits on AI messages, Checks, and custom prompts
  • AI usage depends on token-based processing which can restrict usage
Alternatives
Google Docs→