Prompt Cast

Useful Chrome extension for broadcasting prompts to multiple AI chat sites at once with robust tab management.

Features

• Multi-Site: Send to ChatGPT, Claude, Gemini, Grok... at once
• Side Panel UI: Persistent Chrome side panel interface for better workflow
• Smart Sites Management: Toggles on/off, prevents duplicate tabs, manages focus, drag & drop to reorder
• Keyboard Shortcuts: Alt+P opens side panel, Alt+Shift+P closes all tabs
• Themes: Light/dark/auto with comprehensive CSS variable system

Installation

Store

• Install from Chrome Web Store

Locally

1. Download the zip file from the Releases page
2. Extract the zip file to a folder
3. Open Chrome and navigate to chrome://extensions/
4. Enable "Developer mode" in the top right corner
5. Click "Load unpacked" and select the extracted folder

Usage

1. Click extension icon or press Alt+P to open side panel
2. Type message in the bottom input area
3. Press Enter to send (Shift+Enter for new line)
4. Toggle sites on/off as needed (you have to configure enabled sites first)
5. Drag sites to reorder them for your preferred workflow
6. Use Alt+Shift+P to quickly close all AI site tabs

Sites

Site	URL	Status
ChatGPT	chatgpt.com	✅
Claude	claude.ai	✅
Gemini	gemini.google.com	✅
Grok	grok.com	✅
Perplexity	perplexity.ai	✅
Copilot	copilot.microsoft.com	✅
DeepSeek	chat.deepseek.com	✅
Qwen	chat.qwen.ai	✅

Contribution

Tech Stack

• WXT Framework - Modern web extension development
• Svelte 5 + TypeScript - Reactive UI components
• Tailwind CSS - Utility-first styling
• Playwright - End-to-end testing
• Vitest - Unit testing
• Chrome Extension API (Manifest V3)

Architecture

src/
├── entrypoints/         # WXT entry points
│   ├── background.ts    # Service worker
│   └── sidepanel/       # Svelte side panel UI with stores
├── shared/              # Types, utilities, messaging, focus management
├── background/          # Background script modules
└── types/               # TypeScript definitions

Quick start

git clone https://github.com/dandehoon/prompt-cast
cd prompt-cast
pnpm install && pnpm build

Load in Chrome: chrome://extensions/ → "Load unpacked" → select the dist folder

The extension will appear in your toolbar with the Prompt Cast icon. Click to open the side panel interface.

Commands

# Install dependencies
pnpm install

# Development (hot reload)
pnpm dev

# Build for production
pnpm build

# Run all tests (Vitest)
pnpm test

# Quality checks (type-check, lint, test, build)
pnpm check