Lex vs Notion AI: pricing, features and which to choose

Lex is an AI-focused word processor founded by Nathan Baschez and spun out of Every. TechCrunch reported a $2.75 million seed round led by True Ventures on August 23, 2023, after Lex attracted about 25,000 sign-ups during its first day. Lex’s 2024 annual letter reported 47,000 users making 15 million edits across 400,000 documents, alongside more than 14 trillion language-model tokens processed. The product targets substantial writing and revision rather than standalone text generation. It combines a document editor with AI assistance, comments, shared documents, folders, and model selection. Its current pricing page says Lex is no longer accepting new customers, which materially changes its usefulness for new buyers while existing accounts continue working. Lex remains positioned around AI-assisted writing inside an integrated word-processing workspace.

Lex’s workflow keeps drafting, reference material, conversation, and revision in one browser-based writing environment. Users can write documents, collaborate through comments and sharing, open Ask Lex, attach files or PDFs, and request ideas, counterarguments, rewrites, summaries, or feedback on selected text. Context tags collect reusable background information from files, URLs, Lex documents, and folders, then let users add that material to chats when needed. The 2024 annual letter describes context tags as buckets of reusable information that can be shared across teams, allowing one person to maintain reference material for others. Checks provide inline suggestions, including a Brevity Check, while folders organize documents and shared work. The workflow is aimed at writers who want AI to support judgment, editing, research, and iteration rather than replace authorship.

Lex’s main caveat is availability: new customers cannot subscribe according to the current pricing page, while existing accounts continue working. The free plan’s complete numerical limits are not publicly stated, and Pro usage limits are described as generous rather than given as a fixed quota. Lex’s privacy notice says it collects documents, comments, chat inputs, assistant outputs, account information, usage information, and related metadata. Its terms grant Lex a license to operate the service and provide personalized suggestions, while stating that uploaded content is not used to train its models. Google Docs, ChatGPT, and Grammarly are named direct competitors, with Notion AI, Hemingway Editor, and Writer also relevant alternatives. Existing Lex users should pick it when integrated document editing and reusable context matter most.

Notion AI is Notion Labs’ embedded assistant for workspaces combining notes, documents, tasks, and databases. Launched in 2022 and generally available in 2023, it now drafts and edits pages, answers workspace questions, researches topics, transcribes meetings, searches connected apps, generates formulas, autofills databases, and runs scheduled Custom Agents. Auto routes requests among available models, while named options include Opus 5.5, Astra, Fable, Claude Sonnet 4, GPT-5, GPT-4.1, and Claude 3.7 Sonnet, with availability varying by plan. Free costs $0 and Plus $10 per member monthly, both offering limited AI trials; Business is $20 with AI included, while Enterprise is custom priced. Compared with ChatGPT and Claude, Notion offers deeper page context; Otter.ai remains stronger for dedicated transcription. It suits teams already organized in Notion, but users should verify outputs and monitor credit limits.

A typical request starts in a Notion page, database, or chat, where users can ask Notion AI to draft, summarize, rewrite, translate, generate formulas, create databases, or answer workspace questions. Notion Agent extends this workflow by creating and editing pages and databases while using permitted workspace, connected-app, and web context for multi-step tasks. Research Mode builds detailed reports from workspace and web information, while AI Meeting Notes transcribes conversations, summarizes key points, and extracts follow-ups. Enterprise Search combines Notion with Slack, Google Drive, and GitHub, returning answers with citations. Custom Agents automate recurring work through schedules or triggers, and AI blocks insert generated content into ordinary pages. Database Autofill populates properties, making routine classification and enrichment faster without leaving the workspace.

Notion AI is best understood as an AI layer inside a team workspace rather than a purely standalone chatbot. Its value comes from combining page-aware answers, writing assistance, database autofill, meeting transcription, research reports, and agents that can create or edit Notion content while using connected-app and web context. Auto routes tasks among available models, while users may access named options such as Claude Sonnet 4, GPT-5, GPT-4.1, Opus 5.5, and Astra, depending on plan and availability. Free and Plus include limited trials; Business costs $20 per member monthly, and Enterprise is custom priced, with credits, limits, and provider-retention policies requiring attention. ChatGPT and Claude are stronger general assistants, while Otter.ai focuses more narrowly on transcription. Notion AI suits knowledge-centered teams that accept usage controls and fact-checking.