Liner Review, Pricing & Alternatives (2026)

Liner is an AI research workspace operated by a company whose principal place of business is in Seoul, South Korea. It serves students, academic researchers, professionals, and developers with web search, Scholar search, writing tools, document analysis, and research agents. The company introduced Deep Research on March 20, 2025, with source discovery, citation checking, and long-form reports. Liner also offers developer access through search, visualization, agent, and Router APIs. Its terms say users retain ownership of submitted content while granting Liner a limited license to operate, promote, improve, and develop its services. Liner does not publish a founding year, user count, employee count, or funding total on the cited pages.

A typical Liner session starts with a question, uploaded file, or academic search request. Deep Research breaks the request into related subtasks, searches multiple sources, and returns a report with references, tables, graphs, and additional findings. Related research calls can run concurrently, which the company says reduces repeated prompting. Users can export findings to PDF, Microsoft Word, OneNote, or text. Scholar emphasizes papers, source reliability, and citation volume, drawing from more than 50 academic sources, while file uploads support questions about personal documents. Developers can call Web Search, Scholar Search, Visualization, Quick Answer Agent, Search Agent, Deep Research Agent, and Visual Answer Agent endpoints. API charges vary by feature and complexity, with requests or tokens deducted from prepaid credits. Pick Liner for cited research workflows involving papers, documents, reports, or developer integrations.

Liner combines search infrastructure, source ranking, intent-aware language models, and third-party generative models. Its Deep Research announcement says Scholar draws from more than 50 trusted academic sources, including arXiv, PubMed, Nature, and IEEE, while citation volume helps users assess credibility. Liner also describes an advanced ranker for high-quality references, a fine-tuned language model that understands user intent, and another fine-tuned model that uses selected references. Its pricing page lists 309 generation models, spanning GPT-6.1 and GPT-6 variants, Gemini image models, Claude-related offerings, and other providers. In 2025, Liner announced agents for hypothesis generation, citation recommendation, peer review, and survey simulation. Its API documentation lists Router models including liner-mark-1.3 and liner-gemini-router-1.0.

The free offer includes up to 10 Deep Research reports daily, but Liner says this allowance may change under promotional offers, terms, and subscription policy. Pro costs $17.99 per month or $14.99 per month when billed annually, and includes 20 daily uploads of up to 100 MB each. Max costs $35.99 per month or $29.99 per month annually, with unlimited daily uploads and files up to 200 MB. Team costs $26.99 per user monthly for teams of 2 to 20 seats. API pricing is usage based: Web Search costs $1 per 1,000 requests, Scholar Search costs $0.30, Quick Answer Agent costs $3, Search Agent costs $20, Deep Research Agent costs $200, and Visual Answer Agent costs $150 per 1,000 requests. Router access costs $0.60 to $1 per million input tokens, plus output charges.

Citations do not eliminate the need to verify important claims. Liner warns that generated material can be inaccurate or biased, and its Deep Research announcement says results vary with query complexity, context length, and data recency. Its privacy update also says submitted content may be shared with third-party service providers to process requests and provide AI-powered features, so users should review the current policy before uploading confidential documents. Perplexity is a closer general web research alternative, while Elicit and Consensus focus more tightly on academic literature. ChatGPT and Claude provide broader document and writing tools. Liner’s API also has published endpoint rates, from Web and Scholar Search to long-form Deep Research Agent requests. Pick Liner for cited web and paper research with file handling, exports, and metered developer endpoints.