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
• Smart Tabs: Prevents duplicates, manages focus
• Keyboard: Enter sends, Shift+Enter new line
• Toggles: Enable/disable individual sites
• Persistent: Remembers settings
• Status: Real-time connection indicators

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.

Usage

1. Click extension icon
2. Type message
3. Press Enter to send (Shift+Enter for new line)
4. Toggle sites on/off as needed

Sites

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

Development

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
│   ├── content.ts       # Content script
│   └── popup/           # Svelte popup UI with stores
├── shared/              # Types, utilities, messaging
├── content/             # Content script modules
├── background/          # Background script modules
└── types/               # TypeScript definitions

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