Transform passive video watching into active learning and exploration through AI-powered conversation.
Play AI is a browser extension that lets you chat about YouTube videos using your own AI API credentials. It lives inside YouTube — no tabs, no context switching.
- Native YouTube integration — chat overlay in the sidebar, no leaving the page
- Real-time streaming — AI responses stream as they're generated
- Multi-provider — switch between Anthropic Claude and OpenAI (or any OpenAI-compatible endpoint)
- Persistent conversations — chat history saved per video
- Cross-browser — Chrome, Firefox, Edge
bun install
bun turbo devOpens Chrome with the extension loaded and HMR enabled.
YouTube aggressively throttles browsers with fresh/ephemeral profiles (no cookies, no history). To avoid this, set CHROME_USER_DATA_DIR in apps/extension/.env to your Chrome user data directory so the dev runner copies your real profile:
# apps/extension/.env
CHROME_USER_DATA_DIR="/Users/<you>/Library/Application Support/Google/Chrome" # macOS
# CHROME_USER_DATA_DIR="/home/<you>/.config/google-chrome" # Linux
# CHROME_USER_DATA_DIR="C:\Users\<you>\AppData\Local\Google\Chrome\User Data" # WindowsMake sure Chrome is not running while bun dev is active — the profile is copied at startup, so changes made in your regular Chrome won't appear until the next dev session.
If YouTube still causes issues, use Invidious for development. It has no anti-automation measures and the same video page DOM structure:
bun turbo dev # then manually navigate to any Invidious instanceBuild for distribution:
bun turbo build # unpacked extension in .output/
bun turbo zip # .zip for Chrome Web Store| Doc | What's inside |
|---|---|
| Architecture | Layer structure, data flow, communication patterns, directory layout |
| Dev Guidelines | Design system, component workflow, hooks policy, testing |
| PRD | Product requirements, target users, success metrics, roadmap |