YC active company list audit

Dex

Dex: The AI Coworker in Chrome. Headquartered in San Francisco, CA, United States. Current operating status: active.

Oomira checked this YC company record against source evidence and keeps the current facts, observed dates, and provenance visible before the interactive app loads.

21 facts4 sources3 superseded claims

What changed in the audit

external name

Dexterity -> Dex
2026-06-12 · yc-oss record id 30351: field "former_names" includes "Dexterity"

external name

Dexterity AI -> Dex
2026-06-12 · yc-oss record id 30351: field "former_names" includes "Dexterity AI"

external name

ThirdLayer -> Dex
2026-06-12 · yc-oss record id 30351: field "former_names" includes "ThirdLayer"

Summary: The AI Coworker in Chrome
Description: 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...
Website: https://joindex.com
Hiring: yes
Headquarters: San Francisco, CA, United States
Operating status: active
Industry: B2B

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