The problem with search engines isn’t that they can’t find information, but that there is too much of it. You type in a question, get hundreds of thousands of results, spend time opening them one by one, and read through three articles before finally finding the specific passage you actually need. Liner was built to solve this efficiency problem: an AI-driven search tool that extracts answers directly from search results, with optimizations specifically for academic and research scenarios.
What is Liner?
Liner (getliner.com) is an AI search tool that combines a search engine with AI summarization capabilities. Users input a question, Liner retrieves relevant content from the internet, and the AI synthesizes information from multiple sources to provide a direct answer, complete with source links.
A key feature of Liner is its dedicated academic search mode. In addition to standard web search, it supports retrieving academic papers and research reports, providing students and researchers with a more precise experience for searching academic content.
Initially, Liner launched as a Chrome extension offering webpage highlighting—allowing users to highlight text on any webpage to save and organize those excerpts. It has since evolved into a tool that integrates AI search with content organization.
Core Features
AI Search Answers
Input a question, and Liner searches relevant webpages, using AI to synthesize the content into a direct answer paragraph rather than a list of links. Each answer includes the source website, which you can click to verify the original content.
This approach is highly efficient for questions requiring synthesis across multiple sources—for example, "What are the latest developments in quantum computing in 2024?" Liner can integrate key information from multiple articles into a clear response, saving you from having to open ten different articles to filter through them yourself.
Academic Search Mode
The academic mode is Liner’s differentiating feature. In this mode, the search scope focuses primarily on academic papers, academic publications, and content released by research institutions, filtering out general blogs and marketing articles to directly find academic research results on a given topic.
Suitable scenarios:
- Searching for the current state of research in a specific field
- Finding original literature for a particular theory or method
- Understanding the academic consensus on a scientific question
- Looking for references for paper writing
Compared to Google Scholar, Liner’s academic search adds AI summarization—it doesn’t just find relevant papers but also summarizes their core findings for you.
Webpage Highlighting and Content Saving
Liner’s Chrome extension allows you to highlight and save text while browsing any webpage. All highlighted content syncs to Liner’s knowledge base, accessible and manageable across devices. This feature is particularly useful for users who need to extract key points from large volumes of web content.
Saved highlights can be categorized by topic, forming a personal knowledge library. Paired with AI Q&A, you can review queries like "What did I previously save regarding XX?"
AI-Assisted Questioning and Follow-ups
You can continue to ask follow-up questions on search results, engaging in multi-turn conversations. Liner maintains conversation context, allowing for deep exploration of the searched content, effectively layering AI dialogue capabilities on top of a search engine.
Multi-language Support
It supports search and answers in multiple languages, including Chinese. However, English coverage is more comprehensive for academic content, as a significant portion of academic literature is published in English.
Comparison with Other Tools
vs Perplexity AI: Perplexity is currently the most well-known AI search engine, featuring a clean interface and clear source citations, with a Pro subscription offering more powerful features. The two tools have highly similar positioning; Perplexity has a slight edge in overall maturity and user experience, while Liner’s academic search mode and highlighting/saving capabilities are its differentiating characteristics.
vs ChatGPT (with Search Plugin): ChatGPT’s search function feels more natural within conversational contexts but leans toward general dialogue. Liner focuses specifically on search scenarios, offering higher source credibility and greater focus on research needs.
vs Google Scholar: Google Scholar is the authoritative tool for academic search with the most comprehensive paper indexing. However, it only provides a list of papers, requiring you to read abstracts to judge relevance, without AI summarization. Liner adds AI extraction on top of this, improving screening efficiency.
vs devv.ai: devv.ai focuses on technical developer scenarios, sourcing from GitHub and Stack Overflow. Liner is more general-purpose, with academic search as a specialized feature, but lacks the code-search optimizations found in devv.ai.
vs Elicit (Academic AI Search): Elicit is an AI assistant specifically designed for academic research, offering deeper functionality such as extracting structured information like methodology, sample size, and conclusions from papers. Liner is lighter and more user-friendly, though its features are not as specialized or deep as Elicit’s.
Who Should Use Liner?
Students and Researchers: The academic search mode can quickly find relevant literature in your field, while AI summarization significantly improves the efficiency of screening references, reducing time spent on irrelevant results.
Content Creators Requiring Extensive Information Retrieval: Writing often requires research; Liner’s AI search can quickly provide a synthesized perspective from multiple sources, helping you rapidly build a basic understanding of a topic.
Knowledge-oriented Users Who Like Organizing Web Content: Liner’s webpage highlighting and saving feature is useful for users who have the habit of "saving good content when they read it," allowing them to build their own knowledge library.
Users Who Work Primarily in Chrome: Liner’s Chrome extension seamlessly integrates highlighting and saving into daily browsing, eliminating the need to switch tools.
Limitations
In the AI search space, Perplexity currently offers a superior overall experience and higher brand recognition. As a smaller competitor, Liner is still catching up in terms of feature refinement and content coverage.
The paper coverage in the academic search mode is not as comprehensive as Google Scholar’s, so it may fail to find obscure literature in specific fields.
The free version has query limits; frequent users will need to subscribe to a paid plan.
Coverage of Chinese academic content is significantly less than that of English content. For users needing Chinese academic resources, the experience may be inferior to the English-language scenario.
Pricing
Liner offers a free version with a daily limit on AI search queries. The Pro subscription provides unlimited searches, access to stronger AI models, and advanced features, costing approximately $9–15 per month. Please refer to the official website for specific details.
Liner has its own unique strengths in academic search and content organization. If you have frequent research or academic search needs, try the free version to see if it fits your workflow before deciding whether to upgrade to a subscription.