We envision a world where the overwhelming flood of information becomes a wellspring of clarity and trusted knowledge, empowering every scholar, student, and professional to reach new heights of understanding and innovation. At Liner, our mission is to transform research by seamlessly integrating AI with a vast, academically validated database to deliver precise, source-backed insights faster than ever before.
By harnessing the power of advanced language models and pioneering features like line-by-line citations, scholar mode, and multimodal content analysis, we are building an intelligent research companion that not only turbocharges efficiency but also elevates critical thinking and trust in information. Our platform is designed to help users navigate complexity with confidence in an age where credible knowledge is paramount.
Liner exists to shape the future of research, enabling a global community to work smarter, learn deeper, and generate impact through faster access to reliable, verifiable data. We are dedicated to fostering a smarter knowledge ecosystem that fuels progress, discovery, and lifelong learning worldwide.
Our Review
We've been testing Liner for a few weeks now, and honestly, it feels like someone finally cracked the code on AI-powered research. While most AI tools give you answers that sound convincing but leave you wondering about their accuracy, Liner takes a refreshingly different approach — every single line comes with citations you can actually verify.
The platform serves over 10 million users across 218 countries, which initially made us skeptical. Could something this popular actually live up to the hype? Turns out, yes.
What Sets It Apart
Here's where Liner gets interesting: instead of pulling from the entire chaotic internet, it's been curating a database of trusted academic sources since 2015. When you ask a question, you're not getting a hallucinated answer — you're getting responses backed by peer-reviewed papers with line-by-line citations.
We particularly love the Scholar Mode, which restricts searches to purely academic sources. It's like having a research librarian who never sleeps and can instantly cross-reference thousands of scholarly papers.
The Multimodal Magic
What really impressed us was dropping a dense PDF into Liner and watching it break down complex research into digestible summaries. The tool handles PDFs, PowerPoints, Word docs, and even images with surprising accuracy. We tested it with a 50-page academic paper on climate policy, and within seconds, we had a clear summary with actionable insights.
The highlighting feature syncs across all your devices too, which sounds basic but proves incredibly useful when you're jumping between your laptop and phone during research sessions.
Who Should Consider This
Liner clearly targets students, researchers, and professionals who need reliable information fast. If you're writing academic papers, conducting market research, or just tired of fact-checking every AI response, this feels purpose-built for you.
The $200 million in funding shows serious investor confidence, though the company's still in growth mode with under 25 employees. That lean team has managed to integrate multiple top AI models (ChatGPT-4o, Claude, Gemini) into one coherent platform, which is no small feat.
We'd recommend Liner if you value accuracy over speed and need sources you can actually cite. It's not perfect for casual queries, but for serious research work, it's become an essential tool in our workflow.
Features
AI-generated answers with line-by-line citations
Multimodal content processing (PDFs, PPTs, DOCXs, images)
Highlighting and organization tools syncing across devices
Advanced AI models selection (ChatGPT-4o, Claude, Gemini, Llama 3.1)
Dedicated Scholar Mode for trusted academic sources
AI Copilot for follow-up queries
Integration with Google searches and AI coding assistance
FAQs
Ploy was founded in 2024.
Liner is an AI search engine built for students, researchers, and anyone who needs trustworthy information. It delivers fast, verifiable answers backed by credible sources: academic papers, authoritative publications, and high-quality references. Over 10 million users rely on Liner worldwide, and a16z ranked it as the 4th most-used generative AI product on the web. We are committed to making high-quality information accessible so users can push human knowledge forward.
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