Crosspost Checker

Detect crossposts and track reposts across Reddit.

Crosspost Checker helps you understand how content spreads across Reddit. FEATURES: • Crosspost Detection — Instantly see if a Reddit post has been crossposted to other subreddits • Crosspost Chain — View the full lineage from the original post to the latest crosspost • Duplicate Finder — Discover other posts sharing the same URL across Reddit • User History Analysis — Check if a user frequently posts the same content in multiple subreddits • Timeline View — See when crossposts were made and in what order • Favorites — Save interesting crossposts for later reference • Auto-Open — Automatically opens the analysis panel when visiting a Reddit post • Dark & Light Theme — Toggle between dark and light mode to match your preference HOW IT LOOKS: 1. Visit any Reddit post and click the "Crosspost Checker" button next to the share button 2. The side panel opens with detailed crosspost analysis 3. Switch between Crossposts, Timeline, History, and Favorites tabs 4. Right-click any Reddit link and select "Check crossposts" from the context menu PRIVACY: • No data leaves your browser — all requests go directly to Reddit's public API • No tracking, analytics, or third-party services • Settings and favorites stored locally on your device Requires you to be logged into Reddit for full functionality.