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The AI Coworker in Chrome
ThirdLayer is an applied research and product lab building the next interface for human–AI collaboration. Our first product is Dex, an AI copilot for the browser. Think Cursor for knowledge work, optimized for speed and embedded directly where you work. Most web agents are built for set-and-forget tasks. But real work is fluid and messy—spread across tabs, tools, and evolving decisions. Dex transforms your browser into an intelligent, multimodal workspace that understands your intent through voice, text, and action. It enhances familiar interfaces, automates tedious steps, and removes the friction of handoffs. Beneath the surface, Dex is more than a browser agent — it’s a foundation for: ● Long-term, cross-modal memory grounded in real workflows ● A new interaction layer to replace static UI with a collaborative canvas ● Personalization: understanding how individuals approach tasks and navigate software We're building the infrastructure for adaptive, intent-aware systems that work the way you do.
Dex is an AI-powered workspace that maintains a full operational memory across your workspace, ingesting and structuring data to drive automated, context-aware actions inside the browser. It acts as a self-driving assistant that orchestrates across Gmail, Slack, CRM and 20+ tools, using agents and browser control to execute workflows and keep knowledge up to date.
Dex creates an operational graph and a knowledge manual that together form a living source of truth. It ingests all workspace datapoints (messages, meetings, deals, workflow events), organizes them into entities and relationships, and updates priorities, SOPs, and operating principles automatically. It deploys autonomous agents to orchestrate across apps (Gmail, Slack, CRM, 20+ tools) and can control the browser to navigate tabs, fill forms, and complete tasks. Users can bring their context via an SDK and MCP to apply Dex’s capabilities across their favorite apps. Features include meeting prep with full context, automated follow-ups, CRM updates without data entry, weekly skill-generation automation, and proactive, self-improving behavior with 24/7 Dreamer Agents.
Who it’s for: Operators and teams at mid-market to growth-stage companies who run multiple deals and use multiple tools, including those in B2B SaaS, finance, and enterprise settings, who need a centralized, browser-first AI agent for work automation and knowledge management.
Customers: Google, OpenAI, Goldman Sachs, Salesforce, Palantir, Meta
Public pricing pages with multiple paid tiers; enterprise and private cloud options; on-site and partner mentions; early access program and rolling waitlist; customer testimonials from established enterprises
Regina is the co-founder & CEO of Dex. She studied Mathematics with a concurrent master's in Computational Science at Harvard (dropped out). She previously co-founded Contour AI, a devOps tool for LLM evaluation, helped build the MVP an ecommerce marketplace with 40K+ customers and worked in various tech investment roles.
Co-founder of Dex. Prev Math & Stat at Harvard, quant/ML researcher at Jump Trading, IBM Research, QuantCo, Meta.
Turn your browser into a smart interface that works alongside you.
Dex launches a browser-based AI interface named Dex that collaborates with users inside the browser. It enables smart navigation, cross-app automation, and context-aware actions to reduce tab-switching and streamline workflows across GSuite, GitHub, and live tabs, with future features like meetings, sales automation, and snippets.
Formerly “Dexterity”, “ThirdLayer” · why startups rename →
Cursor for knowledge workers
Self learning computer use agent for developers
