Lex
Free tierCollaborative documents, with powerful AI editing tools.
Free tier available·All audiences·Powered by OpenAI, Anthropic, TogetherAI
Key strengths
AI feedback and editing toolsLive collaboration with no app download requiredMinimalist writing interfaceVersion historyAccess to best-in-class LLMs (GPT-4.1, Claude)Publishing and read-only link sharingAI commands (title ideas, word suggestions, list generation)Enterprise-grade privacy via OpenAI/Anthropic/TogetherAI enterprise APIs
Free tier + paid plans
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Lex — Technical Overview
Lex is a freemium, browser-based collaborative document editor that exposes AI editing capabilities powered by enterprise-grade APIs from OpenAI (GPT-4.1), Anthropic (Claude 4 Opus & Sonnet), and TogetherAI. There is no app download required for collaboration, making it a zero-friction tool for teams.
Key technical characteristics:
- Model providers: OpenAI, Anthropic, TogetherAI — accessed via their respective enterprise APIs, providing privacy guarantees at the infrastructure level.
- AI commands: In-document commands for title generation, word suggestions, list generation, and broader AI feedback and editing workflows.
- Collaboration: Live multi-user document editing without client installation.
- Version history: Built-in document versioning.
- Sharing: Publishing and read-only link sharing supported.
- Pricing tiers: Free tier (no card required); Lex Pro (premium model access, early feature access, iOS app, priority support); Lex Teams add-on (unlimited group use of Lex folders). Monthly subscription with refunds offered.