Quick verdict
Bottom line up front: Lex flips the usual AI writing pitch. Instead of generating a first draft from a prompt, it sits inside a clean, minimal editor and works on words you already wrote — feedback, rewrites, checks and continuations, in the document, alongside your human collaborators. Writers who revise more than they generate will feel the difference immediately. The free plan is a real writing home with capped AI; Pro, at $14.99/month billed annually, buys the premium models and a monthly pot of AI credits.
What is Lex?
Lex (lex.page) is a collaborative AI writing editor built for long-form work — essays, newsletters, fiction, articles and academic writing. The editor itself is deliberately plain: a distraction-free page with version history, comments and real-time collaboration through shared links, no separate app to install. The AI lives inside that page. Ask Lex gives feedback and rewrites on selected text; Checks scan a draft for issues like grammar, clarity and repetition; saved custom prompts put your repeat instructions one click away; and Style Guides plus Knowledge Bases teach the assistant your voice and your project’s context across sessions. Lex says more than 300,000 authors use the editor.
What does Lex do well?
It respects the draft. Because the AI starts from your text, the suggestions tend to sound like editing rather than replacement — tighten this paragraph, check that claim, try a stronger opening for the section you highlighted. Rewind and named Versions make experiments safe: branch a passage, compare, restore. Collaboration is genuinely frictionless — share a link and a co-writer is in the document, human and AI feedback in the same place. Pro routes requests to premium models from OpenAI, Anthropic and TogetherAI through enterprise APIs, and Lex states it does not train its own models on your documents.
Lex pricing
| Plan | Price | What you get |
|---|---|---|
| Free | $0 | Unlimited documents, real-time collaboration, basic AI models with usage limits on Ask Lex, Checks and custom prompts |
| Lex Pro | $14.99/month billed annually ($179.88/year) | Premium AI models, $30 of monthly AI credits, iOS app access, priority email support, money-back guarantee |
| Lex Teams | See lex.page | Shared folder workflows for teams collaborating at volume |
The public pricing page leads with the annual Pro figure; a separate monthly Pro price is not listed there. Students, academics and nonprofits can ask about discounted Pro pricing by email.
Pros and cons
Pros
- AI that edits your words instead of replacing them — feedback, checks and rewrites in context
- Real-time collaboration through a shared link, free, with no app install for guests
- Style Guides and Knowledge Bases carry your voice and project context between sessions
- Versions and Rewind make it safe to try radical rewrites
Cons
- Free plan caps AI usage, so heavy Ask Lex users will hit the ceiling
- iOS app access is a Pro benefit, not part of the free plan
- Track Changes has been listed as coming soon rather than shipped
- Writers who want template-driven bulk generation are better served elsewhere — that is not Lex’s bet
Who is Lex for?
Newsletter writers, essayists, novelists, journalists and students whose work goes through real revision, and small editorial teams who want human and AI feedback in one document. High-volume content marketers who measure output in posts per day will find Lex’s restraint frustrating — deliberately so.
Verdict
Lex is the AI writing tool for people who like writing. It will not produce a month of content from a keyword list, and it is not trying to. What it does — sit beside a draft and make the next version better, with your collaborators in the same room — it does with unusual taste. Start free; if you find yourself rationing Ask Lex, Pro’s annual price is easy to justify.
Frequently asked questions
Is Lex free?
Yes. The free plan includes unlimited documents and real-time collaboration, with basic AI models and usage limits on Ask Lex, Checks and custom prompts. No credit card is needed to start.
How much does Lex Pro cost?
$14.99 per month billed annually, which is $179.88 per year. Pro includes premium AI models, $30 of monthly AI credits, iOS app access and priority support.
Which AI models does Lex use?
Free accounts use basic models. Pro unlocks premium models from OpenAI, Anthropic and TogetherAI — recent listings include GPT-5 class and Claude Opus class models — routed through enterprise APIs.
Can I collaborate in Lex for free?
Yes. Real-time collaborative documents and shared edit links work on the free plan; Lex Teams adds shared folder workflows for teams working at volume.