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Liner

liner.com

From $1.25/mo Free plan WebWindowsmacOSiOSAndroidAPI
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Spec score 8.9 #5 of 28 in AI Research Assistants

What it is

Liner combines AI search, academic research, and writing tools for professional workflows. Its search answers include citations users can follow, and searches can be limited to a chosen pool of sources. Liner Scholar supports paper discovery, citation following, comparisons across papers, literature reviews, and research hypotheses. Liner Write drafts from a topic, adds citations, edits text with AI, and exports to PDF or DOCX. Free accounts get unlimited Advanced Search and access to Image Generation and Deep Research, but have no agent credits, receive answers with ads, and can upload one file per day up to 25MB. Pro and Max list ChatGPT, Gemini, and Claude model access, with larger upload limits and ad-free search. Liner is available on Android, iOS, macOS, Windows, web, as an extension, and through an API. Pro costs $14.99 a month billed annually; Max costs $29.99 a month billed annually. Team includes a dedicated workspace and excludes team data from AI training.

Spec sheet

What it does
Liner provides cited AI search, academic research tools, and professional writing workflows.Read 15 Oct 2026 · liner.com
Product
Liner offers AI search, academic research, and writing tools for professional workflows.Read 29 Sep 2026 · liner.com
Audience
Liner Write identifies sales personnel, marketers, small business owners, and consultants as intended users.Read 29 Sep 2026 · liner.com
Platforms
Liner lists apps for iOS, Android, Mac, and Windows, plus Chrome and Edge browser extensions.Read 29 Sep 2026 · liner.com
Security
Liner says users can request deletion of their account and activity, and that it regularly checks sensitive personal data and securely deletes it.Read 29 Sep 2026 · liner.com
Compliance
Liner lists SOC 2 Type I and II, HIPAA, and ISO 27001:2022 among its security and compliance credentials.Read 29 Sep 2026 · liner.com
Support
The pricing page says Enterprise includes a dedicated manager and onboarding sessions, and lists dedicated customer success support for customized AI solutions.Read 29 Sep 2026 · liner.com
Headquarters
Seoul, Republic of KoreaRead 28 Sep 2026 · liner.com
Founded
2015Read 28 Sep 2026 · liner.com
Academic search
Liner Scholar is designed to find and compare papers, recommend citations, and produce literature reviews.Read 15 Oct 2026 · liner.com
Actions integrations
The Actions API lets an agent create tickets, send messages, or update records in each end user's connected applications.Read 15 Oct 2026 · liner.com
AI models
The Pro and Max plans list access to ChatGPT, Gemini, and Claude models.Read 29 Sep 2026 · liner.com
API coverage
The developer portal documents Model, Search, Visualization, Quick Answer Agent, Search Agent, Deep Research Agent, Visual Answer Agent, and Actions APIs.Read 15 Oct 2026 · liner.com
API pricing
The developer pricing page lists Web Search at $1 per 1,000 requests and Agent API calls at $3 per 1,000 requests, with usage-based billing.Read 15 Oct 2026 · liner.com
Browser extension
The Chrome extension can search, summarize, highlight, and bookmark webpages, PDFs, and YouTube videos.Read 15 Oct 2026 · chromewebstore.google.com
Cited answers
Liner presents answers with source links that users can inspect and supports follow-up questions.Read 15 Oct 2026 · liner.com
Cited search
Liner says its AI search answers cite reputable sources that users can follow and check.Read 29 Sep 2026 · liner.com
Company facts
LinkedIn lists Liner as privately held, founded in 2015, headquartered in San Francisco, and employing 51–200 people.Read 15 Oct 2026 · linkedin.com
Company legal name
Crunchbase lists the legal name as Liner Corp. and identifies Jinu Kim and Chanmin Woo as co-founders.Read 15 Oct 2026 · crunchbase.com
Documentation depth
The developer portal includes quick starts, endpoint references, request-oriented API sections, rate-limit material, legal pages, and support links.Read 15 Oct 2026 · liner.com
File analysis
Paid plans support document uploads for summaries and question answering, with file-size and daily-upload limits varying by plan.Read 15 Oct 2026 · liner.com
File upload limits
The Free plan allows one upload per day up to 25MB per file, while Pro allows 20 daily uploads up to 100MB and Max allows unlimited daily uploads up to 200MB.Read 29 Sep 2026 · liner.com
Funding investors
Seoul Economic Daily reported that LB Investment led the 50 billion won round, with existing and new Korean financial investors participating.Read 15 Oct 2026 · en.sedaily.com
Funding news
A GlobeNewswire release dated August 25, 2026 reported a $36.1 million Series C and approximately $64.3 million cumulative funding.Read 15 Oct 2026 · globenewswire.com
Image generation
The Free, Pro, and Max plans include access to image-generation features.Read 15 Oct 2026 · liner.com
Independent comparison
AI Chat Daily rated Liner 3.9/5, praising citations and highlighter workflow while saying Perplexity is stronger overall and the free tier is more limited.Read 15 Oct 2026 · aichatdaily.com
Independent usability review
AISO Tools rated Liner 4.1/5 overall, praising capture and cross-source search but describing synthesis depth and export portability as weaker areas.Read 15 Oct 2026 · aisotools.com
Limit: highlight export
A Google Play reviewer complained that highlights must be exported individually and said there was no API or download-all function.Read 15 Oct 2026 · play.google.com
Limit: highlighting reliability
A Google Play reviewer reported highlights moving position and the highlight control being hidden behind text-selection controls.Read 15 Oct 2026 · play.google.com
Limit: industry specificity
A G2 reviewer wanted more industry-specific solutions.Read 15 Oct 2026 · g2.com
Limit: Mac app experience
An Apple reviewer described the App Store Mac experience as buggy, slow, and difficult to customize while praising the research answers.Read 15 Oct 2026 · apps.apple.com
MCP
Liner offers a remote Streamable HTTP MCP server for web search, scholarly search, cited answers, and deep research.Read 15 Oct 2026 · liner.com
MCP authentication
The MCP service supports OAuth 2.1 browser sign-in and bearer-token authentication with a Liner API key for headless use.Read 15 Oct 2026 · liner.com
Model access
Pro and Max plans advertise access to more than 350 AI models, including current OpenAI, Google, Anthropic, xAI, Perplexity, and DeepSeek models.Read 15 Oct 2026 · liner.com
Notable news
Liner announced Actions MCP on September 29, 2026, describing a single connection to roughly 1,100 external applications.Read 15 Oct 2026 · liner.com
Praise: academic accuracy
G2 reviewers praised content precision, source-backed answers, ease of implementation, and easy model training or integration.Read 15 Oct 2026 · g2.com
Privacy infrastructure
Liner's privacy policy names Google Cloud Platform for infrastructure and analysis, AWS for marketing, and Customer.io for marketing data processing.Read 15 Oct 2026 · liner.com
Products
The service is organized around Liner search, Liner Scholar for academic work, and Liner Write for drafting and editing.Read 15 Oct 2026 · liner.com
Rating on Apple App Store
4.4 out of 5 from 1.4K ratingsRead 15 Oct 2026 · apps.apple.com
Rating on Chrome Web Store
4.4 out of 5 from 6K ratingsRead 15 Oct 2026 · chromewebstore.google.com
Rating on G2
4.3 out of 5 from 3 reviewsRead 15 Oct 2026 · g2.com
Rating on Google Play
4.0 out of 5 from 4.69K reviewsRead 15 Oct 2026 · play.google.com
Rating on Trustpilot
3.0 out of 5 from 3 reviewsRead 15 Oct 2026 · trustpilot.com
Research
Liner Scholar supports paper discovery, citation following, multi-paper comparison, literature reviews, and research hypotheses.Read 29 Sep 2026 · liner.com
Research agents
Its research agents include Citation Recommender, Hypothesis Generator, Peer Review, Survey Simulator, Research Tracer, and Literature Review.Read 15 Oct 2026 · liner.com
SDK compatibility
Liner says its Model API uses the OpenAI Chat Completions format so existing OpenAI SDKs can be used as-is.Read 15 Oct 2026 · liner.com
Source collection
Liner search lets users ask questions about a specific pool of sources.Read 29 Sep 2026 · liner.com
Team privacy
Team-plan data is stated to be excluded from AI training and the plan includes a dedicated workspace with administrative controls.Read 15 Oct 2026 · liner.com
Trustpilot review quality
Trustpilot warns that Liner's profile has no history of inviting reviews and that the small sample may not be representative.Read 15 Oct 2026 · trustpilot.com
User scale
The August 2026 funding report said Liner had 14 million users across about 220 countries.Read 15 Oct 2026 · en.sedaily.com
Writing
Liner Write can draft from a topic, add citations, edit text with AI, and export documents as PDF or DOCX.Read 29 Sep 2026 · liner.com
Writing workflow
Liner Write combines search, drafting, editing, verification, and document creation in one workspace.Read 15 Oct 2026 · liner.com

Plans and prices

Free Free Unlimited Advanced Search · Image Generation and Deep Research · 1 file upload/day up to 25MB · ads Read 15 Oct 2026 · liner.com
Pro $14.99 a year $14.99/month, billed annually (monthly price shown: $17.99) 1,000 agent credits · Unlimited Advanced Search · Image Generation and Deep Research access · 20 file uploads/day (up to 100MB/file) · ChatGPT, Gemini, and Claude models · Ad-free search Read 29 Sep 2026 · liner.com
Pro annual $14.99 a month billed annually 350+ AI models · Unlimited Advanced Search · Image Generation and Deep Research · 20 uploads/day up to 100MB · ad-free · all Liner products Read 15 Oct 2026 · liner.com
Pro $17.99 a month monthly 350+ AI models · Unlimited Advanced Search · Image Generation and Deep Research · 20 uploads/day up to 100MB · ad-free · all Liner products Read 15 Oct 2026 · liner.com
Team $26.99 a month per seat 2–20 members · centralized billing · dedicated workspace · admin controls · team data excluded from AI training · collaboration access Read 15 Oct 2026 · liner.com
Max $29.99 a year $29.99/month, billed annually (monthly price shown: $35.99) 2,500 agent credits · Unlimited Advanced Search · Image Generation and Deep Research access · Unlimited file uploads/day (up to 200MB/file) · ChatGPT, Gemini, and Claude models · Ad-free search Read 29 Sep 2026 · liner.com
Max annual $29.99 a month billed annually 350+ AI models · Unlimited Advanced Search · Image Generation and Deep Research · Unlimited uploads/day up to 200MB · ad-free · all Liner products Read 15 Oct 2026 · liner.com
Max $35.99 a month monthly 350+ AI models · Unlimited Advanced Search · Image Generation and Deep Research · Unlimited uploads/day up to 200MB · ad-free · all Liner products Read 15 Oct 2026 · liner.com
Enterprise Priced on request Team features · dedicated manager · onboarding · audit logs · volume discounts Read 15 Oct 2026 · liner.com

Every Liner plan and price →

Strong points and limits

Strong points

  • Search answers include checkable citations
  • Scholar supports literature reviews and paper comparison
  • Write exports to PDF or DOCX
  • Available across mobile, desktop, web, extension, and API
  • Team data excluded from AI training

Limits

  • Free plan includes zero agent credits/month
  • Free uploads limited to one 25MB file daily
  • Pro requires annual billing at $14.99 a month

Who it suits

Liner suits professionals who need cited AI search alongside academic research or AI-assisted writing. Its Team plan is relevant to groups seeking shared workspace controls and team data exclusion from AI training.

Liner in depth

Read the full write-up

Liner is an AI search and research workspace with tools for turning findings into cited documents. It best suits professionals who move between web research, academic papers and writing. The trade-off is that its most capable individual plans require annual billing, while free use has tight file and credit limits.

Overview

Liner combines search answers with citations readers can follow, paper research, and AI-assisted writing. That combination is useful when a task involves both finding material and shaping it into a document; it is less compelling for someone who only needs a general chatbot.

Users can direct search to a specific pool of sources, and the product supports web and file sources. A five-source limit constrains work that needs to compare a larger collection in one pass, so researchers handling broad literature sets should weigh that boundary before choosing it.

Key features

Search and Scholar

Cited answers offer a way to check the material behind a response instead of treating it as a standalone conclusion. Liner Scholar adds paper discovery, citation following, comparisons across papers, literature reviews and research hypotheses. Those tools make Liner a stronger fit for synthesis than a search product focused only on quick answers.

Writing and uploads

Liner Write can draft from a topic, add citations, edit text with AI and export to PDF or DOCX. That is a practical bridge from research to working documents, particularly for sales personnel, marketers, small business owners and consultants identified as intended users. Upload allowances vary substantially by plan, making heavier file-based work a reason to move beyond Free.

Models and privacy

Pro and Max include ChatGPT, Gemini and Claude models. Liner says users can request deletion of their account and activity, and that it checks for sensitive personal data and securely deletes it. Its stated credentials include SOC 2 Type I and II, HIPAA and ISO 27001:2022. Team adds a dedicated workspace with admin controls and excludes team data from AI training, advantages for organizations managing shared work.

Pricing

Liner is freemium. Free costs nothing and includes unlimited Advanced Search, Image Generation and Deep Research access, but grants 0 agent credits per month, allows one upload a day up to 25MB per file, and puts ads in answers. It is a way to access the search and research modes, but not a substantial agent-credit allowance.

Pro is $14.99 a year (billed $14.99/month, billed annually; monthly price shown: $17.99). It includes 1,000 agent credits, unlimited Advanced Search, Image Generation and Deep Research access, 20 daily uploads up to 100MB each, the three named AI models and ad-free search. It suits regular individual users who can commit annually; the monthly option shown costs more.

Max is $29.99 a year (billed $29.99/month, billed annually; monthly price shown: $35.99). It raises the allowance to 2,500 agent credits and unlimited daily uploads up to 200MB each, while retaining the search modes, models and ad-free search. Choose it over Pro when the higher credit and file ceilings justify the higher annual-billed monthly rate.

Team costs $26.99 a month per seat for 2–20 members. It includes everything in Max, centralized management and billing, a dedicated workspace with admin controls, exclusion of team data from AI training, and early access to collaboration features. The per-seat price and two-member minimum make it an organizational plan rather than an individual upgrade.

Enterprise has custom pricing. It includes everything in Team, plus a dedicated manager, onboarding sessions, audit logs and higher discount rates; Liner also describes dedicated customer success support for customized AI solutions. This is the plan for organizations seeking tailored support and onboarding.

Platforms

Liner supports Android, iOS, macOS, Windows and web, as well as an extension and API. This broad reach suits users who need access across desktop, mobile and browser workflows.

Who it's for

Choose Liner if your work depends on checking cited answers, following academic references or turning research into exportable drafts. Its named audience of sales personnel, marketers, small business owners and consultants may find Write useful alongside search. It is a weaker fit for high-volume file research on Free, or for projects that need to examine more than five sources at once.

Pros and cons

Research connects to writing: Scholar’s paper tools and Write’s citation and export functions cover several steps in one workflow.

Checkable search answers: citations provide a route to inspect the supporting sources.

Clear plan distinctions: upload quotas rise from one daily file on Free to 20 on Pro and unlimited on Max, with higher per-file limits at each step.

Free is constrained for agent work: it includes 0 agent credits per month and answers with ads.

Annual billing affects individual plan costs: Pro and Max show lower monthly prices when billed annually, while their displayed monthly prices are higher.

The five-source ceiling narrows collection-based work: tasks requiring a larger source pool may need another approach.

Alternatives

AI Research Assistants is a useful category overview if you want to compare the field before choosing a product.

Choose Perplexity if you want freemium cited search across Android, API, iOS, macOS, web and Windows; its Pro plan is $20 a month and is described for serious work with expanded use.

Genspark Design is another freemium option, with a Free plan that provides 100 credits per day.

Consider Fabric if a yearly-billed $96/yr Plus plan with 50GB storage, 50MB file uploads and 100 spaces fits better than Liner’s research-and-writing emphasis.

Innogath offers a free plan with 500 credits per month, basic-depth Deep Research, Markdown export and one concurrent research task.

Kimi Deep Research provides a free monthly allowance measured by token consumption rather than query count.

Gab AI Research Assistant is a freemium alternative with 250 starting credits and access to AI models using credits.

You.com may suit users prioritizing a free allowance of 100 queries per day and web and news results.

Consensus is another freemium research option, with unlimited paper searches and limited Pro messages on its Free Tier.

Verdict

Liner is a strong choice for research-oriented professionals who want cited search, academic paper tools and document drafting in one product. Its main reason to choose it is the connection between source discovery and writing; look elsewhere if the five-source ceiling or the cost and annual terms of larger individual allowances do not suit your work.

Verdict

Liner combines source-based search with research and writing functions, and spans several platforms. Check the free upload and credit limits, and note that the stated Pro monthly price is billed annually.

Where Specifiction places it

Alternatives to LinerAll alternatives →