Liner

Liner platform overview and academic research engine

Liner (accessible at liner.com, founded by Luke Jinu Kim) is an artificial intelligence research assistant, academic discovery engine, and web productivity workspace. Originally developed as a popular web and PDF highlighting tool, Liner has evolved into an academic research platform centered around Liner Scholar.

The platform indexes over 460 million academic papers, peer-reviewed journals, and scientific publications. Liner combines academic search with agentic multi-step research, automated citation generation, web page highlighting, and AI document writing (Liner Write), delivering verified scientific insights with high factual grounding.

Core research capabilities and Liner Scholar tools

Liner delivers features for academic investigation and literature review:

• Liner Scholar database: Direct access to 460M+ academic papers with filterable publication dates, citation counts, and authors.
• Agentic Deep Research: Dispatches AI agents to review dozens of scholarly publications and draft structured research syntheses.
• Verifiable scholarly citations: Automatically formats and embeds citations in APA, MLA, Chicago, and BibTeX styles.
• Web & PDF highlighter: Highlight critical passages across web pages and PDF files with synchronized cloud notes.
• Liner Write document editor: Draft essays, literature reviews, and research briefs with real-time citation assistance.
• Browser extension integration: Access Liner AI side-by-side on any webpage, Google Scholar search, or PDF reader.

Comparative benchmark: Liner vs. Consensus and Scite.ai

Liner combines a massive academic index with web highlighting and document writing tools.

Practical applications and operational limits

• Literature review synthesis: Query complex biomedical, engineering, or social science topics to aggregate key papers and methodologies.
• Dissertation & thesis authoring: Draft academic chapters while automatically generating verified bibliography entries in APA or MLA format.
• Web research organization: Highlight key passages across web pages and compile organized research summaries.
• Scholarly source verification: Cross-check claims against peer-reviewed publication databases to avoid AI hallucinations.

Operational limits: Free tier restricts the number of monthly deep research runs and advanced model queries. Accessing full-text PDFs of closed paywalled journals requires institutional library access.

Subscription plans and Pro pricing

Liner offers free basic research and highlighting with an upgraded Pro subscription:

*Pricing and plan details verified as of August 2026.

Step-by-step workflow

1. Open Liner: Navigate to liner.com or install the browser extension.
2. Search academic topic: Enter a research question in Liner Scholar to filter relevant papers.
3. Launch Deep Research: Instruct the AI agent to review findings, compare studies, and compile a structured brief.
4. Export citations & notes: Export formatted bibliographies and notes directly to Word, Notion, or BibTeX.

Editorial verdict

• Best for: University students, PhD candidates, medical researchers, and academics looking for an AI research workspace with scholarly citations and web highlighting.
• Not recommended for: Software engineering teams looking for terminal coding agents (like Cursor).
• Learning curve: Minimal. The browser extension and web dashboard are intuitive.
• Value threshold: The Pro plan ($14.99/mo annual) is cost-effective for active researchers writing literature reviews and papers.
• Bottom line: Liner provides a specialized academic AI assistant, combining a 460M+ paper database with automated citations and web highlighting.