Instagram Unfollowers is a client-side browser tool that helps users identify Instagram accounts they follow that don't follow them back. The application runs entirely in the browser, scraping data from Instagram's website through authenticated requests. It features a modular React/Preact architecture with localStorage persistence for whitelists, cached scan results, and user settings. The tool includes anti-rate limiting measures, real-time progressive data loading, bilingual support (EN/ES), and comprehensive whitelist management with export/import capabilities. Users can scan their follows, review non-followers with filtering options, select accounts to unfollow, and execute unfollow operations with built-in protections against Instagram action blocks.