Liner

Liner is an AI research and highlighting tool used by students, researchers, and knowledge workers. It combines a browser extension for highlighting and saving web content with an AI assistant that can search the web, summarize sources, and answer questions with citations.

## What Liner Does Well

**Highlighting and annotation** is Liner's original feature. The browser extension lets users highlight text on any webpage and save it to a personal library. Highlights can be color-coded, annotated, and organized by topic. This creates a research archive that persists beyond browser history.

**AI search with citations** differentiates Liner from a simple bookmarking tool. When users ask a research question, Liner searches the web and constructs an answer with direct citations to the sources used. The answer includes confidence scores and links to the original articles, letting users verify claims.

**Source quality emphasis** prioritizes research papers, academic publications, and authoritative sources over general web content — useful for students and researchers who need credible citations rather than blog posts.

**YouTube summarization** extends the research capability to video content. Liner can summarize YouTube videos with timestamped key points, letting users extract the key content without watching the full video.

**PDF highlighting** lets users upload PDFs (research papers, reports, ebooks) and highlight/annotate them in the browser alongside web content.

## Who Liner Is For

Liner is used primarily by students, graduate researchers, journalists, and knowledge workers who do significant reading and research online. It integrates with popular note-taking tools. Pricing starts free with a $9.99/month plan for full AI features.