SimilarTube is an AI-powered Chrome extension that scans YouTube to find similar channels based on a given channel. It provides real-time results with key metrics like engagement rate (ER) and video view rate (VVR) for quick influencer screening. The tool automatically extracts public email addresses and social media accounts, and offers email matching and template filling for faster outreach. It also helps YouTubers analyze competitors and assess niche value, making it useful for marketers, sales teams, and analysts.