diff --git a/docs/ecosystem/renderers.md b/docs/ecosystem/renderers.md
index 2c9e51738..356d17e18 100644
--- a/docs/ecosystem/renderers.md
+++ b/docs/ecosystem/renderers.md
@@ -16,6 +16,7 @@ Community and third-party A2UI renderer implementations.
 | **@zhama/a2ui** | React (Web) | ✅ | ❌ | — | [npm](https://www.npmjs.com/package/@zhama/a2ui) |
 | **A2UI-react** | React (Web) | ✅ | ❌ | ![Stars](https://img.shields.io/github/stars/jem-computer/A2UI-react?style=flat-square&label=⭐) ![Last commit](https://img.shields.io/github/last-commit/jem-computer/A2UI-react?style=flat-square&label=updated) | [GitHub](https://github.com/jem-computer/A2UI-react) |
 | **a2ui-swiftui** | SwiftUI (iOS, iPadOS, macOS, tvOS, watchOS, visionOS) | ✅ | ✅ | ![Stars](https://img.shields.io/github/stars/BBC6BAE9/a2ui-swiftui?style=flat-square&label=⭐) ![Last commit](https://img.shields.io/github/last-commit/BBC6BAE9/a2ui-swiftui?style=flat-square&label=updated) | [GitHub](https://github.com/BBC6BAE9/a2ui-swiftui) |
+| **a2ui-oat** | Web (vanilla JS, no framework) | ❌ | ✅ | ![Stars](https://img.shields.io/github/stars/MisterTK/a2ui-oat?style=flat-square&label=⭐) ![Last commit](https://img.shields.io/github/last-commit/MisterTK/a2ui-oat?style=flat-square&label=updated) | [GitHub](https://github.com/MisterTK/a2ui-oat) · [npm](https://www.npmjs.com/package/a2ui-oat) · [Demo](https://mistertk.github.io/a2ui-oat/) |
 
 ### Notable Mentions
 
@@ -35,6 +36,8 @@ These projects are early-stage or experimental:
 
 **a2ui-swiftui** is a native SwiftUI renderer supporting iOS, macOS, visionOS, watchOS, and tvOS. It covers all 18 standard A2UI components with dual v0.8 + v0.9 protocol support, includes JSONL streaming, and uses the Observation framework for reactivity.
 
+**a2ui-oat** is the first framework-free web renderer, built on [Oat CSS](https://oat.ink/) semantic styling. It provides 37 components and 22 client-side functions with a minimal footprint (~13KB). Key features include a custom catalog with theme support, a dual-mode architecture, and `@a2ui/web-lib` integration. v0.9 only.
+
 ### Python / PyPI
 
 No credible A2UI renderer packages were found on PyPI as of March 2026. A2UI renderers are client-side (UI) libraries, so the ecosystem is naturally focused on JavaScript/TypeScript and native mobile frameworks.