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 Documentation Notes
AI Model Access
Lex integrates with multiple leading LLM providers via enterprise APIs:
- OpenAI: GPT-4.1
- Anthropic: Claude 4 Opus & Sonnet
- TogetherAI
Premium model access (GPT-4.1, Claude 4 Opus & Sonnet) is gated behind the Lex Pro paid plan.
Privacy & Data Handling
Lex routes AI requests through enterprise-tier API agreements with OpenAI, Anthropic, and TogetherAI, providing enterprise-grade privacy protections at the model-provider level.
Collaboration Architecture
- Real-time, live collaboration is supported natively in the browser — no client download or installation required.
- Document sharing is available via read-only links and publishing.
AI Commands
In-document AI commands include:
- Title idea generation
- Word suggestions
- List generation
- AI feedback and editing tools
Plans & Billing
| Plan | Details |
|---|---|
| Free | No credit card required |
| Lex Pro | GPT-4.1, Claude 4 Opus & Sonnet, early feature access, iOS app, priority support |
| Lex Teams (add-on) | Unlimited group use of Lex folders |
Billing is monthly; refunds are offered.