Engain is an AI-powered Reddit marketing platform that helps brands discover high-intent threads, post comments, and build visibility across subreddits. It provides access to aged, high-karma Reddit accounts so users can comment and post without managing their own accounts. The platform includes automated upvoting, brand and competitor mention tracking, keyword search, and scheduling tools. Engain also targets LLM and AI search visibility, since Reddit is frequently cited by tools like ChatGPT and Google AI Overviews.