Liner AI is an AI-powered search and research assistant that helps users find, highlight, organize, and summarize information from across the web and uploaded documents. Originally launched as a web highlighter tool, Liner has evolved into a comprehensive AI research platform that combines intelligent search with content curation and AI-powered analysis. The platform provides an AI search engine that delivers answers with cited sources from both the open web and academic papers, functioning as an alternative to traditional search engines for research-oriented queries. Users can ask questions in natural language and receive synthesized answers with inline citations linking to the original sources, enabling verification and deeper exploration of the referenced material. Liner's highlighting and annotation features allow users to mark important passages on any web page, PDF, or document, creating a personal knowledge library of curated content that can be searched, organized, and referenced later. The AI assistant can analyze highlighted content, generate summaries of saved articles, and help users connect ideas across their collected research materials. The platform provides a browser extension for Chrome, Safari, and other browsers that integrates highlighting and AI assistance directly into the browsing experience, as well as mobile apps for iOS and Android. Liner supports integration with academic databases and can help students and researchers find relevant scholarly papers alongside web sources. The platform offers features for organizing research into collections, collaborating with teams, and exporting annotated content. Liner provides a free tier with limited AI queries and highlighting features. Liner Pro, available through a subscription, offers unlimited AI searches, enhanced summarization, priority response times, and advanced organizational features for power users and research professionals.
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