Dex
The AI Coworker in Chrome
Based based in San Francisco, CA, USA, Dex works in b2b, founded in 2025.
Profile
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 positioned in b2b, a segment that rewards a clear, focused offering.
Its base of operations is San Francisco, CA, USA.
Its current recorded stage is Winter 2025.
Its team size is recorded as 2 employees.
Directory analysis
Dex is an AI copilot for the Chrome browser developed by the startup ThirdLayer. It turns the web browsing experience into an intelligent, multimodal workspace that understands user intent via voice, text, and action, automating routine tasks and reducing friction across tabs and tools. The product is positioned as the next interface for human‑AI collaboration in the browser.
Positioning: Dex targets B2B customers who need integrated AI assistance within web workflows, differentiating itself from other browser agents by focusing on fluid, multi‑tab contexts and long‑term memory. As a very early‑stage startup with only two employees, it remains a niche, experimental offering.
Note: Dex is a browser‑based AI coworker from a tiny startup.
Auto-generated directory analysis from public data · updated 9 Oct 2026. Informational only, not investment advice.
| Sector | B2B |
|---|---|
| Headquarters | San Francisco, CA, USA |
| Country | USA |
| Founded | 2025 |
| Employees | 2 |
| Stage | Winter 2025 |
Website: joindex.com
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