# Liner > AI search and research agents that give cited answers, find academic papers and draft documents. Liner is a set of AI agents for search, academic research and writing. Liner is used to ask questions and receive answers with clickable citations, to find and compare papers and build literature reviews in Liner Scholar, and to draft emails, reports and newsletters in Liner Write. One subscription covers all three products. **Best for:** Students, researchers and professionals who need sourced answers and help with literature reviews and citations more than open-ended chat. - Official site: https://liner.com - Listed in: [Research & AI Search](https://trendhub.net/ai-tools/category/research-tools), [Academic & Essay Writing](https://trendhub.net/ai-tools/category/academic-writing), [AI Writing Assistant](https://trendhub.net/ai-tools/category/ai-writing-assistant) - Last checked: 2026-10-09 (facts taken from liner.com) - Source page: https://trendhub.net/ai-tools/liner-ai-search-academic-research-agents ## Key facts - Platforms: Web, iOS, Android, macOS, Windows, Browser extension, API, MCP - Pricing model: Freemium - Free plan: Yes - API: Yes - Made by: Liner ## What is Liner? Liner is an AI research assistant organised into three products that share one account. Liner itself is a search tool that answers questions with cited sources, supports follow-up questions and can present complex subjects as mind maps. Liner Scholar is aimed at academic work: it finds and compares papers on a topic, recommends citations and produces literature reviews, with specialised agents such as Hypothesis Generator, Citation Recommender, Research Tracer and Survey Simulator. Liner Write turns a topic into a draft and helps shape and polish emails, newsletters and reports in the same window. Users can upload files for summaries, run Deep Research reports and, on paid plans, choose models from ChatGPT, Gemini and Claude. Liner is offered on the web, as mobile and desktop apps and as a browser extension, and developers can use its search APIs and MCP servers. ## Key features - **Cited Search Answers**: Returns answers with line-by-line citations that open the source in one click. - **Deep Research**: Gathers information on a topic and delivers it as an organised report. - **Paper Discovery and Comparison**: Finds academic papers on a subject and sets them side by side in Liner Scholar. - **Research Agents**: Runs dedicated agents for literature reviews, citation recommendations, hypothesis generation and survey design. - **Document Drafting**: Creates drafts from a topic and edits them into emails, newsletters or reports in Liner Write. - **File Upload Analysis**: Summarises uploaded PDFs and papers and extracts their key points, with size and daily limits by plan. ## Use cases - **Literature Reviews**: Assemble a structured review of prior work for a thesis chapter. - **Finding Supporting Citations**: Locate sources that back a claim in a paper you are writing. - **Fact-Checking Client Reports**: Verify figures and statements against cited sources before sending. - **Product and Market Research**: Break down an unfamiliar topic while planning a feature. - **Weekly Newsletter Drafts**: Turn notes into a formatted first draft and refine it. ## Things to know - **Agent features consume credits**: Tasks such as Deep Research, literature reviews and citation recommendations each deduct a set number of credits per request. - **No refunds**: Payments are not refunded; cancelling stops the next renewal. - **Free answers show ads**: The free plan displays ads in answers, which paid plans remove. - **Team size limits**: The Team plan is for 2 to 20 members; larger organisations are directed to Enterprise. ## FAQs ### What is Liner? Liner is an AI search and research tool that provides cited answers, academic paper research through Liner Scholar and document drafting through Liner Write. ### Is Liner free? Yes, Liner has a free plan with unlimited Advanced Search, one file upload a day and ads in answers. Liner notes that free credits for agent tasks are limited. ### How much does Liner cost? Liner: a free plan is available. Paid plan rates are published on liner.com. Check the official pricing page for current amounts. ### Do I need separate subscriptions for Liner Scholar and Liner Write? No. Liner's pricing page says a single plan covers all three products: Liner, Scholar and Write. ### Does Liner work on mobile? Yes. Liner lists downloads for iOS and Android, as well as Mac, Windows, Chrome and Edge. ### Does Liner have an API? Yes. Liner offers search and model APIs, an actions API and MCP servers for search and scholar functions, with separate API pricing. ### Does Liner offer refunds? No. Liner states that it does not offer refunds, though a subscription can be cancelled before it renews or before a free trial ends. --- Source: https://trendhub.net/ai-tools/liner-ai-search-academic-research-agents (trendhub)