Dex

Dex is an AI-powered browser assistant built by ThirdLayer, Inc. and launched out of Y Combinator's W25 batch. Installed as a Chrome extension, it turns the browser into a shared operational workspace: an "Operational Graph" pulls together messages, meeting notes, deal updates, and workflow events from connected apps into one structured knowledge base, while a "Knowledge Manual" automatically captures a team's priorities and standard operating procedures. On top of this memory layer, Dex runs autonomous agents that trigger workflows on a schedule or in response to events across Gmail, Slack, CRMs, and more than a dozen other tools, and it can act directly inside the browser to navigate tabs and complete tasks. Background agents continuously update the knowledge base and generate new automations tailored to a team's recurring work. It connects to tools including Asana, Google Drive, Linear, Google Calendar, Notion, Google Sheets, Google Docs, Slack, and Attio, and exposes an SDK and MCP server for pulling its context into other systems. Dex targets operators juggling many deals across many tools — the site cites mid-market private equity firms, B2B SaaS startups, and growth-stage companies as target users. It offers a free plan plus paid Pro, Business, and Enterprise tiers, though as a Chrome-extension-based tool it is not yet available as a standalone desktop or mobile app.