Lex

Spec sheet

Product

Lex describes itself as collaborative documents with AI editing tools.Read 5 Oct 2026 · lex.page

Intended users

Lex says it is for writing that needs editing and revision, including academic papers, customer-facing copy, important emails and fiction.Read 5 Oct 2026 · lex.page

Free plan

YesRead 23 Sep 2026 · lex.page

API

Lex publishes a public API documentation site at docs.lex.page.Read 21 Oct 2026 · docs.lex.page

Integrations

The documented native integration is with Kit, formerly ConvertKit, for analyzing newsletters and sending drafts back to Kit.Read 21 Oct 2026 · lex.page

Security

Lex says it encrypts web requests with TLS, restricts and logs database access, requires two-factor authentication for infrastructure access, and backs up its database continuously.Read 5 Oct 2026 · lex.page

AI feedback

Users can ask AI for draft feedback, brainstorming and rewrites.Read 21 Oct 2026 · lex.page

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.Read 5 Oct 2026 · lex.page

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.Read 21 Oct 2026 · lex.page

AI writing tools

Lex offers AI feedback for drafts, brainstorming and rewrites, plus commands and one-click title ideas.Read 5 Oct 2026 · lex.page

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.Read 21 Oct 2026 · docs.lex.page

Ask Lex chat

Ask Lex provides conversational help about a document or highlighted passage.Read 21 Oct 2026 · lex.page

Backups

Lex says Heroku Postgres continuous protection allows database rollback to any point during the previous four days.Read 21 Oct 2026 · lex.page

Brand voice controls

YesRead 23 Sep 2026 · lex.page

Browser extension

NoRead 23 Sep 2026 · lex.page

Checks

Checks provides line-level suggestions for brevity, grammar, readability and related edits.Read 21 Oct 2026 · lex.page

Collaboration

Documents and folders can be shared, and collaborators can edit together in real time through links.Read 21 Oct 2026 · lex.page

Company facts

LinkedIn lists Lex as privately held, founded in 2023, headquartered in San Francisco, with 2–10 employees.Read 21 Oct 2026 · linkedin.com

Company legal name

Lex’s Terms identify the provider as Lex, Inc.Read 21 Oct 2026 · lex.page

Custom prompts

Users can create reusable prompts and share them with collaborators.Read 21 Oct 2026 · lex.page

Customization

Lex supports custom reusable prompts and shared context tags that give its AI background about a team's voice, goals and past work.Read 5 Oct 2026 · lex.page

Desktop app

NoRead 23 Sep 2026 · lex.page

Founder

Citybiz identified Nathan Baschez as Lex’s 2023 founder and said Lex spun out of Every Media.Read 21 Oct 2026 · citybiz.co

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.Read 5 Oct 2026 · lex.page

Funding

Citybiz reported on August 24, 2023 that Lex raised $2.75 million in seed funding led by True Ventures.Read 21 Oct 2026 · citybiz.co

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.Read 5 Oct 2026 · lex.page

Knowledge bases

Knowledge Bases provide persistent background context for more personalized AI assistance.Read 21 Oct 2026 · lex.page

Limit: app support complaint

An App Store reviewer reported being charged $179 after a week trial and receiving no response to refund emails.Read 21 Oct 2026 · apps.apple.com

Limit: enterprise assurance

Cascade Insights found no publicly available SOC 2 or ISO 27001 report, HIPAA statement, SSO details, role-based access controls or audit-log documentation.Read 21 Oct 2026 · cascadeinsights.com

Limit: narrow scope

Cascade Insights said Lex is strong for prose but lacks campaign management, templates, SEO workflows, CRM connections, automation and broader workspace functions.Read 21 Oct 2026 · cascadeinsights.com

Mobile access

Lex describes mobile web collaboration and says Pro includes access to its iOS app.Read 5 Oct 2026 · lex.page

Mobile app

YesRead 23 Sep 2026 · lex.page

Mobile web

Shared documents can be opened and edited from a browser without installing an app.Read 21 Oct 2026 · lex.page

Model providers

Lex says it uses enterprise APIs from OpenAI, Anthropic and TogetherAI.Read 21 Oct 2026 · lex.page

Notable news

Cascade Insights reported that Lex launched in late 2022 and raised its seed round in 2023.Read 21 Oct 2026 · cascadeinsights.com

Outages

Lex reports only minor outages so far and no data loss or security breaches.Read 21 Oct 2026 · lex.page

Praise: critical feedback

Cascade Insights found Lex’s checks unusually useful because they identify weak arguments and unsupported claims instead of merely praising drafts.Read 21 Oct 2026 · cascadeinsights.com

Praise: focused editor

Cascade Insights praised Lex’s stripped-down, Google Docs-like interface and AI that stays available without dominating the writing screen.Read 21 Oct 2026 · cascadeinsights.com

Prompt library

Lex offers a library of contributed prompts covering writing types such as academic papers and scripts.Read 21 Oct 2026 · lex.page

Publishing

Lex can publish read-only links to finished documents.Read 21 Oct 2026 · lex.page

Rating on AppBrain

2.50 out of 5 from 2 ratingsRead 21 Oct 2026 · appbrain.com

Rating on Apple App Store

3.3 out of 5 from 3 ratingsRead 21 Oct 2026 · apps.apple.com

Rating on G2

0.0 out of 5 from 0 reviewsRead 21 Oct 2026 · g2.com

Security controls

Lex states that web traffic uses TLS, infrastructure access requires two-factor authentication, database access is restricted, access is logged, and code receives peer review.Read 21 Oct 2026 · lex.page

Style guides

Style Guides let users train Lex on their writing voice for drafting and editing.Read 21 Oct 2026 · lex.page

Support and refunds

Lex offers Pro members priority support by email and says customers who do not love Lex after a month can contact it for a refund.Read 5 Oct 2026 · lex.page

System requirement

The Lex Writer iPhone app requires iOS 16.0 or later and is 5.2 MB.Read 21 Oct 2026 · apps.apple.com

Version control

Rewind lets users scrub through and restore earlier document versions, while Versions creates named save points.Read 21 Oct 2026 · lex.page

What Lex does

Lex is an AI-powered word processor for drafting, editing, brainstorming and collaboration.Read 21 Oct 2026 · lex.page

Plans and prices

Every Lex plan and price →

Where Specifiction places it

• AI Writing Tools#24 of 2699.0
• Copywriting Tools#4 of 278.9
• Writing Assistants Software#4 of 269.0
• AI writing assistants#13 of 258.7