Liner AI

Tool Introduction

Liner AI is a research-first platform built to help users find, verify, and synthesize information with precision. It delivers fast, accurate answers backed by line-by-line citations to original sources. Originally launched as a web highlighter in 2015, it has evolved into a powerful AI research assistant and search engine using large language models and agentic workflows. Designed for academic rigor and trustworthiness, Liner supports the full research cycle—from idea generation to citation management—making it especially useful for students, professionals, and researchers.

Demo Available?

Liner provides a 14-day free trial for Essential and Professional plans without requiring a credit card on the free tier.

Tool's Accuracy

Liner emphasizes sentence-level citation and source transparency for factual queries in English and Korean. Users report reliable, well-referenced answers grounded in authoritative web content, especially for academic research.

Aggregate Rating

4.3/5 stars (estimated from informal sources and limited reviews)

Detailed Overview

Liner combines AI search, multi-agent workflows, and academic tools for transparent, evidence-backed research.

What Liner AI Does

Liner integrates an AI search engine with agentic workflows to deliver reliable answers tied to trusted sources. Users ask complex questions; specialized agents scan over 200 million academic papers and web content. Every sentence is linked to its source. Scholar Mode formats responses for citation-ready output. Deep Research breaks queries into sub-tasks for thorough reporting. The platform also analyzes PDFs and images for summarization or translation. It's available on web, mobile app, and browser extension.

Who Liner AI is for

Liner serves anyone needing credible insights:

Students use it for papers with verified citations.
Researchers generate hypotheses or literature reviews.
Journalists fact-check breaking news.
Consultants analyze markets with evidence-based reports.
Knowledge workers quickly verify information across topics.

Top Differentiators

Line-by-Line Citations: Every claim links directly to its source.
Agentic Workflows: Multiple agents handle literature reviews, fact-checking, hypothesis generation.
Academic Tools: Scholar Mode outputs formatted citations using standard styles like APA or MLA.
Community Curation: Users enhance accuracy by sharing high-quality highlights.
Model Flexibility: Choose from top models like GPT-4o or Claude based on task needs.
Transparency: See how each answer was built through visible reasoning steps.

Introductory Video

Founding Year

2015

Target Industry

B2C, B2B, SMB, Higher education, Scientific research, Journalism, Consulting, Media

Available Integrations

Apple App Store: Provides mobile access to Liner AI’s research and citation tools on iOS devices.
Samsung Galaxy Store: Enables Android users to use Liner AI via native app distribution.
Web Browser Access: Allows direct use of Liner’s AI search and Scholar Mode through browser-based interfaces.

Liner uses a freemium model with four plan options:

Basic: Free. Includes 10 Deep Research uses per day, basic search, and highlighting tools.

Essential: $25.99/month or $19.58/month when billed annually. Offers unlimited AI agent calls and added research features.

Professional: $35.99/month or $27.08/month with annual billing. Adds access to all AI models, unlimited file uploads, and 300 AI-generated images per month.

Team: Custom pricing available upon request. Designed for organizations needing advanced security, centralized billing, and collaboration tools.

A 14-day free trial is available for the Essential and Professional plans. The Basic plan does not require a credit card to sign up.

Pricing last verified: 11/15/2025
Official Source: https://liner.com/
Disclaimer: Pricing is subject to change. Please confirm current pricing on the vendor site.

Features & Specs

Multi-Agent Intelligence: Automates tasks like literature review and hypothesis evaluation using domain-specific agents.
Citation Precision: Each output sentence includes a direct link to the original source.
Scholar Mode: Automatically formats responses in academic styles such as APA or Chicago.
Deep Research Mode: Handles layered queries by breaking them into parts for thorough analysis.
File & Image Analysis: Accepts uploads like PDFs or images to summarize content or extract keywords.
Model Selection: Offers up to eight advanced models including GPT variants and Liner’s own fine-tuned Llama 3 model (Liner 7B).
Custom Agents: Build your own task-specific agents tailored to unique workflows.
Cross Platform Access: Use on desktop via web app, browser extension (Copilot), or mobile app without losing progress.
Speed & Performance: Delivers results quickly—from seconds up to a few minutes—based on complexity of request.
User Reach: Trusted by over 11 million users globally; strong adoption in U.S. higher education sector.
Rate Limits (Free Tier): Up to 10 deep searches per day; paid plan details not publicly disclosed.
Supported Formats: Works with text documents, PDF files, and image uploads across supported platforms.

Security & Compliance

Liner states that user privacy is a core value and emphasizes user control over data usage. While specific encryption standards are not disclosed publicly, the platform prioritizes secure handling of user information.

Industry Use-Cases

Higher Education

Liner AI helps students cite sources accurately and streamline research papers. Scholar Mode and Citation Recommender automate citation formatting and source discovery, reducing plagiarism risk and boosting academic quality.

Academics use Liner to perform efficient literature reviews. The platform scans relevant studies, extracts findings, and highlights gaps, helping researchers stay current and uncover new research questions.

Journalism & Media

Journalists get fast, verifiable information with line-by-line citations. Liner scans trusted sources to support accurate reporting during tight deadlines or developing stories.

Media professionals use Liner to analyze how narratives evolve. The Research Tracer agent identifies shifts in coverage over time, aiding long-form storytelling or trend analysis.

Business & Consulting

Consultants rely on Liner for market intelligence with credible data. The platform delivers source-cited insights from industry reports, supporting evidence-based client recommendations.

Teams synthesize complex material rapidly by uploading documents. Liner summarizes key points with citations, enabling faster decision-making with less manual research effort.

Scientific Research

Scientists use Liner’s Hypothesis Generator to explore new ideas. It evaluates novelty and feasibility using academic literature, accelerating early-stage research design.

Manuscript reviewers upload papers for evaluation. Liner provides structured feedback on rigor and impact, helping streamline the peer review process.

Tool's Alternatives

Perplexity
Offers AI-powered information discovery with strong source transparency and a conversational interface. It supports follow-up questions but may lack academic citation formatting features.

Elicit
Focuses on academic workflows by automating literature reviews and evidence synthesis. Its structured research approach helps with systematic reviews, though its database access can be limited.

Scite
Provides scientific literature support with citation context and evidence classification. It helps assess claim reliability but is less suited for general-purpose or non-academic queries.

Ask Steve
A browser-based tool combining summarization, translation, and content creation. It uses modular skills for customization but lacks Liner's deep focus on academic citations.

AI Blaze
Delivers free tools for student-focused AI summarization and research. It prioritizes cost-effective access but may not offer integrated citation or source tracking.

Powerdrill
Designed for academic users needing automated citations and visual mapping of literature. Its strengths lie in visual synthesis rather than broad-use summarization features.

Frequently Asked Questions

What does Liner AI help users accomplish?
Liner AI helps users research, fact-check, and cite sources using AI search and agentic workflows. It supports academic writing, market analysis, scientific discovery, and journalistic reporting with transparent, source-linked answers.

Which plans are available and how much do they cost?
Liner offers four plans: Basic (free), Essential ($25.99/month or $19.58 billed annually), Professional ($35.99/month or $27.08 billed annually), and Team (custom pricing). Essential and Professional include a 14-day free trial.

What is included in the Basic free plan?
The Basic plan includes 10 Deep Research uses per day, basic AI search features, and highlighting tools. No credit card is required to sign up for the free tier.

How does Liner ensure citation accuracy in responses?
Each sentence in Liner’s output links directly to its original source. Scholar Mode formats citations in APA, MLA, or Chicago styles for academically trustworthy results.

What platforms can I use Liner AI on?
Liner works on desktop browsers, a mobile app via Apple App Store or Samsung Galaxy Store, and as a browser extension called Copilot. Progress syncs across devices.

Can I analyze my own files or images with Liner?
Yes. Users can upload PDFs or image files for summarization or translation. The platform extracts key information while maintaining citation accuracy where applicable.

Which language models does Liner support?
Liner offers up to eight models including GPT-4o, Claude variants, and its own fine-tuned model called Liner 7B based on Llama 3 architecture.

Who typically uses Liner AI for research tasks?
Students use it to write papers with citations; researchers generate hypotheses; journalists fact-check stories; consultants create data-backed reports using uploaded content.

Does Liner offer custom agent creation for specific needs?
Yes. Users can build custom agents tailored to unique tasks like literature review, hypothesis testing, or trend tracking within their own research workflow.

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