Lex
Lex is a collaborative document editor with AI tools for drafting and revising writing.
What Lex is
Lex is a collaborative document editor with AI tools for drafting and revising writing. It can provide feedback, support brainstorming and rewrites, take commands and generate one-click title ideas. Documents can be shared for live collaboration, comments or read-only publishing, and collaborators can join from a link without downloading an app. Teams can create reusable prompts and shared context tags to give the AI background about their voice, goals and past work. The Kit integration can analyze recent and high-performing newsletters to shape custom drafting prompts and suggest subject lines, then send finished writing to Kit. Lex also offers a developer API. It is intended for writing that benefits from editing, including academic papers, customer-facing copy, important emails and fiction. The free account limits Ask Lex to 30 messages per day, saved prompt runs to five per month and a low daily AI processing budget. Lex is available on the web and iOS; mobile web collaboration is supported, and Pro includes iOS app access. Lex says customer content is not used to train AI models without explicit written permission.
Good
- Supports live collaboration, comments and read-only sharing.
- Custom prompts and context tags can guide the AI.
- Kit integration supports newsletter drafting workflows.
- Offers a developer API.
- Free plan is available.
Watch out
- Free accounts have daily and monthly AI-use limits.
- No browser extension or desktop app.
- Pro pricing is not displayed.
Who it suits
Lex may suit individuals and teams working on drafts that need revision, from academic papers and fiction to customer-facing copy and important emails. Its shared prompts and context tags may help teams give AI guidance about their voice and goals.
Verdict
Lex combines collaborative documents with AI editing and team-specific writing context. The free plan has usage caps, and buyers will need to check pricing for Pro, which includes iOS app access and priority email support.
Plans and prices
From Lex's own pricing page, checked 21 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | 30 Ask Lex messages per day · 5 saved-prompt runs per month · low daily AI budget |
| Lex Pro monthly | $24.99 a month | premium AI models · early feature access · iOS app · priority email support · monthly; price announced effective July 18, 2025 |
| Lex Pro annual | $179.88 a year | premium AI models · early feature access · iOS app · priority email support · annual; equivalent to $14.99/month; price announced effective July 18, 2025 |
| Lex Pro | — | Access to premium AI models · early access to features and the iOS app · priority email support · Monthly version mentioned; price not displayed on the opened pricing page. |
The facts
Each one read from Lex's own pages, with the date it was checked.
What it does
- AI feedback
- Users can ask AI for draft feedback, brainstorming and rewrites.checked 21 Oct 2026
- AI privacy
- Lex says it does not train AI models on customer content without explicit written permission and uses OpenAI, Anthropic and Together.ai vendors with policies against training on customer data.checked 5 Oct 2026
- AI training policy
- Lex says it does not train models on customer content without explicit written permission and would notify users if that policy changed.checked 21 Oct 2026
- AI writing tools
- Lex offers AI feedback for drafts, brainstorming and rewrites, plus commands and one-click title ideas.checked 5 Oct 2026
- API
- Lex publishes a public API documentation site at docs.lex.page.checked 21 Oct 2026
- API documentation depth
- The public documentation currently exposes an introduction and documentation index, with no detailed endpoint or SDK material visible on the opened page.checked 21 Oct 2026
- Ask Lex chat
- Ask Lex provides conversational help about a document or highlighted passage.checked 21 Oct 2026
- Backups
- Lex says Heroku Postgres continuous protection allows database rollback to any point during the previous four days.checked 21 Oct 2026
- Brand voice controls
- Yeschecked 23 Sep 2026
- Checks
- Checks provides line-level suggestions for brevity, grammar, readability and related edits.checked 21 Oct 2026
- Collaboration
- Documents and folders can be shared, and collaborators can edit together in real time through links.checked 21 Oct 2026
- Customization
- Lex supports custom reusable prompts and shared context tags that give its AI background about a team's voice, goals and past work.checked 5 Oct 2026
- Custom prompts
- Users can create reusable prompts and share them with collaborators.checked 21 Oct 2026
- Founder
- Citybiz identified Nathan Baschez as Lex’s 2023 founder and said Lex spun out of Every Media.checked 21 Oct 2026
- Funding
- Citybiz reported on August 24, 2023 that Lex raised $2.75 million in seed funding led by True Ventures.checked 21 Oct 2026
- Integration
- The Kit integration analyzes recent and high-performing newsletters to create custom prompts for drafting in the user's voice and suggesting subject lines, and can send finished writing to Kit.checked 5 Oct 2026
- Integrations
- The documented native integration is with Kit, formerly ConvertKit, for analyzing newsletters and sending drafts back to Kit.checked 21 Oct 2026
- Intended users
- Lex says it is for writing that needs editing and revision, including academic papers, customer-facing copy, important emails and fiction.checked 5 Oct 2026
Where it runs
- Browser extension
- Nochecked 23 Sep 2026
- Desktop app
- Nochecked 23 Sep 2026
The company
- Company facts
- LinkedIn lists Lex as privately held, founded in 2023, headquartered in San Francisco, with 2–10 employees.checked 21 Oct 2026
- Company legal name
- Lex’s Terms identify the provider as Lex, Inc.checked 21 Oct 2026
Money
- Free account limits
- Free users are limited to 30 Ask Lex messages per day, five saved prompt runs per month and a low daily AI processing budget.checked 5 Oct 2026
- Free plan
- Yeschecked 23 Sep 2026
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