AI replies for YouTube comments, right where you read them.
Install the ReplySpark extension and every YouTube comment gets a one-click reply draft in your chosen tone. Free, no signup, nothing leaves your browser.
Draft replies inside YouTube
A ✨ ReplySpark button appears under every comment on youtube.com. One click writes a reply you can copy or edit.
Three tones, instantly
Warm & friendly, Funny & playful, or Clear & professional. Your choice is remembered across every video.
Works offline, no signup
The extension drafts locally in your browser. No account, no API key, no comment data leaves your machine.
Upgrade to full automation
Connect your channel on replyspark.ai and ReplySpark replies automatically in your own trained voice, 24/7.
How to install
- Download the ZIP below and unzip it.
- Open chrome://extensions in Chrome, Edge, Brave, Arc or Opera.
- Turn on Developer mode (top-right toggle).
- Click "Load unpacked" and select the unzipped folder.
- Open any YouTube video and look under the comments.
Works in every Chromium browser. A one-click Chrome Web Store listing is on the way — start free to get notified.