ChatLayer

ChatLayer adds a small power-user layer to ChatGPT and Gemini: reply outlines, diagram rendering, and lightweight navigation without replacing the original UI.

Features

• Floating table of contents for every AI reply, including replies without headings.
• Clickable Reply n labels that include the start of the matching user message (up to two lines) and jump to that AI response.
• Inline Mermaid rendering through a sandboxed extension page.
• PlantUML rendering through a configurable PlantUML server.
• Diagram viewer with zoom, pan, reset, copy source, and open-on-server controls.
• Auto/Light/Dark TOC theme controls.

Supported Sites

• https://chatgpt.com/*
• https://chat.openai.com/*
• https://gemini.google.com/*

Install

Download chatlayer-vX.Y.Z.zip from the latest GitHub Release, extract it, then load the folder from chrome://extensions/ with Developer mode enabled.

To build from source:

make install
make build

Load the generated dist/ directory in Chrome.

Development

make dev # Vite development mode
make ci # typecheck, lint, tests, and production build
make clean # remove generated output

Privacy

Mermaid runs locally from bundled extension code. PlantUML source is sent to the configured PlantUML server; use a local or self-hosted server for private diagrams.