Dex by Thirdlayer
Dex is an AI browser copilot that transforms Chrome into an intelligent workspace by providing context-aware assistance, cross-app integration, and seamless workflow automation directly in your browser.
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Product Information
Updated:Dec 12, 2025
What is Dex by Thirdlayer
Dex by ThirdLayer is a Chrome extension that serves as an AI-powered second brain for your browser. Developed by ThirdLayer, an applied research and product lab, Dex reimagines browser interaction by adding a personalized AI action layer across all your workflows. It's designed to be private by default and integrates with 14+ popular apps including Asana, Google Workspace, Notion, and Slack. The tool is backed by top-tier investors and is part of Y Combinator's W25 batch.
Key Features of Dex by Thirdlayer
Dex by ThirdLayer is an AI-powered browser copilot that transforms Chrome into an intelligent workspace. It integrates directly into existing workflows, offering real-time assistance through voice and text commands, cross-app memory, and context-aware automation. The tool understands user intent, maintains task history across different applications, and provides personalized assistance while ensuring data privacy and security through granular permissions.
Context-Aware AI Integration: Embeds directly into browser workflows, understanding on-screen activity and user intent to provide relevant assistance in real-time
Cross-App Memory: Maintains long-term memory across different applications and tabs, eliminating the need for constant context switching
Voice and Text Control: Offers multiple interaction methods through voice and text commands for enhanced accessibility and efficiency
Privacy-First Design: Features granular permissions and user control over data, with options to disconnect or delete data at any time
Use Cases of Dex by Thirdlayer
Meeting Management: Streamlines scheduling and preparation by handling calendar coordination and gathering relevant information across tabs
Data Analysis: Assists in building lead lists and analyzing data across multiple sheets and sources with single-click automation
Email Communication: Enables sending personalized emails to multiple recipients while maintaining context and efficiency
Task Management: Integrates with various productivity apps to track and manage tasks across different platforms
Pros
Seamless integration with existing browser workflows
Strong privacy controls and data protection
Comprehensive cross-app functionality
Cons
Limited to Chrome browser platform
Requires subscription for advanced features
May have learning curve for optimal usage
How to Use Dex by Thirdlayer
Install Chrome Extension: Dex is available as a Chrome extension. Install it from the Chrome Web Store (Note: Currently in private Beta)
Request Access: Request early access through their website (getdexterity.com) to start using Dex for free during the Beta period
Connect Your Apps: Connect Dex with your existing work apps like Gmail, Google Drive, Slack, Asana, Notion, and other supported integrations (14+ apps supported)
Grant Permissions: Set up granular permissions to control what data Dex can access. You can disconnect or delete your data anytime as Dex is private by design
Start Using Features: Begin using Dex's features directly in your browser: manage tasks across tabs, schedule meetings, analyze data, send emails, and access AI-powered assistance
Use Voice or Text Commands: Interact with Dex using simple voice and text commands to automate tasks and get assistance within your browser
Save and Organize Notes: Use Dex to capture and organize thoughts and notes with zero friction - Dex will maintain context and make them retrievable
Let Dex Learn: As you use Dex, it learns from your interactions and remembers your preferences to provide better personalized assistance over time
Dex by Thirdlayer FAQs
Dex is an AI copilot for browsers, developed by ThirdLayer, that turns your browser into a single AI workspace. It's a Chrome extension that helps manage tasks, context, and workflows across multiple tabs and applications.
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