React Sync Tab: Watch Along Extension

Watch along with your favorite creators. Syncs videos across tabs for smooth reactions. Works with Netflix, Crunchyroll & more.

React Sync is a Chrome extension that makes it easy to watch two videos — a reaction and the original content — in perfect synchronization. Built for creators and fans, React Sync links browser tabs and uploaded or externally linked videos using countdowns, sync points, and smart playback controls. Whether you’re reacting to a movie or show, React Sync eliminates manual syncing and keeps both videos aligned throughout the entire experience. Key Features: • Countdown sync timing • Custom timestamp offsets for precise alignment • Master controls: play, pause, rewind, and fast-forward across both tabs • Flexible layouts: Side-by-Side, Picture-in-Picture, and Top-Bottom • Supports Crunchyroll, Netflix, Amazon Prime, YouTube, Vimeo, uploaded content, and more Note: Streaming support may vary by platform and requires users to be logged into their own accounts. For best results, we recommend using ad-free versions. Designed for creators who film reactions and fans who want to watch along — with no editing or complicated setup required. This extension does not collect any user data and runs entirely within the browser for enhanced privacy.