Liner
AI search engine with cited answers across multiple models.
Liner is a strong pick for anyone who needs cited, verifiable answers—students, researchers, and fact-checkers. The credit system is a real limitation: the free tier now has zero Agent credits, so you'll pay to unlock Deep Research and premium models. If you value source transparency and multi-model access, it's a compelling alternative to Perplexity Pro, but budget for Pro or Max. For academic workflows, Liner Scholar's specialized tools (Literature Review, Hypothesis Evaluator) give it a clear edge over general-purpose chatbots.
Verified 8d ago · liveness 62/100 · cite: rightaichoice.com/tools/liner
- Students and academics needing cited sources
- Researchers analyzing large PDFs
- Professionals who fact-check answers
- Teams requiring multi-model AI access
- Users seeking a free unlimited AI assistant
- Casual users who dislike per-credit systems
- Ad-averse users on the free tier
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Skip Liner if you need unlimited free AI answers, prefer flat-rate pricing without credits, or don't require cited sources in your searches.
Deep Research costs 40 credits per request, which can deplete your monthly 1,000-credit Pro allowance in just 25 requests.
Liner's pricing fits students and researchers who need cited answers but is pricier on a per-credit basis than Perplexity Pro's flat-rate $20/mo. For heavy research, Max at $29.99/mo may be worth it, but casual users might find cheaper alternatives like ChatGPT Plus at $20/mo.
In short
Liner — AI search engine with cited answers across multiple models. Best for Students and academics needing cited sources, Researchers analyzing large PDFs, Professionals who fact-check answers. Free to start; paid plans from $14.99/mo.
What people actually say about Liner — is it worth it?
We ran a structured research pass across product reviews, community discussions, and post-purchase forum threads to surface the patterns vendors won't publish themselves. Below: the recurring strengths, the hidden costs people mention most, and the cohort that consistently regrets adopting this tool.
63 mentions across 4 sources (Reddit, Hacker News, App Store, Lemmy) · researched Jul 3, 2026.
- +Provides more detailed output than Perplexity, according to users.
- +Multi-model access (GPT-5, Gemini, Claude) in one interface.
- +Good for general coding and daily AI queries.
- +Research-focused with cited sources in answers.
- +Deep Research reports and file upload available.
- −Subscription scams: charges without granting access, no refunds.
- −Academic citations are sometimes invented or inaccurate.
- −Customer support unresponsive to billing complaints.
- −Credit system limits free users heavily (100 credits/month).
- −Free tier cannot upload images, limiting functionality.
- • Deep Research costs 40 credits per use
- • Premium external models cost 30 credits each
- • No refunds for yearly auto-renewals
Viability Score
How well maintained and how widely used is Liner? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: August 2026
How we score →Key Features
- Advanced Search with cited sources
- Line-by-Line Citation
- Deep Research report generation
- Image generation
- Multi-model access (ChatGPT, Gemini, Claude)
- File upload and analysis (PDF, up to 200MB on Max)
- Liner Scholar: Literature Review
- Liner Scholar: Hypothesis Evaluator
- Liner Scholar: Survey Generator
- Liner Scholar: Citation Recommender
- Liner Scholar: Peer Review
- Liner Write document drafting
- Chrome and Edge browser extensions
- Mobile apps for iOS and Android
- Research Assistant (10/day free, unlimited paid)
About Liner
Liner is an AI-powered search engine designed for people who need answers they can trust. Instead of relying on a single model, it draws on multiple major AI models—including ChatGPT, Gemini, and Claude—and backs every result with cited sources. The platform centers on three products: Liner Search for everyday queries, Liner Scholar for academic workflows (Literature Review, Hypothesis Evaluator, etc.), and Liner Write for drafting documents. It also includes Deep Research, which compiles comprehensive, organized reports on a topic, and image generation, all accessible through a credit-based system. Liner is built for students, researchers, and professionals who rely on source-backed information. You can upload PDFs (up to 200MB on the Max plan) for summaries and key insights, and the Line-by-Line Citation feature shows exactly where each part of an answer comes from. The free plan gives you 0 Agent credits per month, meaning features like Deep Research and premium models are off-limits without upgrading. Pro is $14.99/month (billed annually) and includes 1,000 Agent credits, while Max is $29.99/month (billed annually) with 2,500 credits. A Team plan at $26.99/seat/month adds admin controls, and an Enterprise plan offers custom solutions. Liner is available as a web app, Chrome and Edge extensions, and mobile apps for iOS and Android. Compared to tools like Perplexity Pro, which offers unlimited queries, Liner's credit system is a deliberate trade-off: you get verifiable, cited answers across multiple models, but heavy usage requires a paid tier. For academic research, Liner Scholar's specialized tools give it an edge over general-purpose chatbots, while its multi-model access sets it apart from single-model assistants. If source credibility is your top priority, Liner is worth the investment.
Behind the Verdict
Liner's core strength is source transparency. Unlike many AI search tools that give you a confident answer with no way to verify, Liner shows you exactly which sources back each claim, down to the line. This is a game-changer for students, researchers, and professionals who need to fact-check before using information. The multi-model access is another differentiator: you can ask a question and get responses drawn from ChatGPT, Gemini, and Claude, all in one interface. You don't have to juggle multiple subscriptions. Liner also shines in academic contexts. The Scholar suite—Literature Review, Hypothesis Evaluator, Survey Generator, Citation Recommender, Peer Review—is purpose-built for research workflows. These aren't generic prompts; they're structured tools that guide you through complex tasks. For example, Literature Review compiles academic sources into a coherent review, and Citation Recommender suggests relevant papers based on your context. The Deep Research feature is also noteworthy. It goes beyond a single answer and produces a multi-section report on a topic, saving you hours of manual research. The file upload capability is practical: you can upload a PDF and get a summary, or ask questions about its contents. Line-by-Line Citation makes it easy to trace where the AI got its information, which is critical for academic integrity. However, Liner's credit system is a double-edged sword. The free tier gives you zero Agent credits, so you can't even try Deep Research or premium models without paying. This is a sharp departure from competitors like Perplexity Pro, which offers unlimited queries for a flat rate. If you're a heavy user, credits can run out quickly—Deep Research alone costs 40 credits per request, and the base Pro plan only includes 1,000 credits. For casual users who just want quick answers, Liner might feel restrictive. Another weakness is that accuracy claims are based on a single benchmark (OpenAI SimpleQA). While Liner reports superior scores, real-world performance can vary. The lack of a free trial for the credit-consuming features is a barrier to evaluation. There's no way to test Deep Research or the Scholar tools without committing to a paid plan. Privacywise, Liner claims secure encryption and privacy-first design, but details are sparse. If your use case centers on academic research, Liner is a clear winner. If you're a professional who needs reliable, cited answers for reports or decision-making, it's also a strong choice. But if you're a casual user looking for an unlimited free AI assistant, you'll be disappointed.
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Real-world workflow fit
Concrete scenarios for the personas Liner actually fits — and what changes day-one when you adopt it.
You need to write a literature review for a thesis.
Outcome: Use Liner Scholar's Literature Review tool (40 credits/request) to gather and synthesize sources, then cite them line-by-line, saving hours of manual research.
You need a comprehensive report on a new market trend.
Outcome: Run Deep Research (40 credits/request) to get a structured, cited report you can trust for your analysis, rather than compiling scattered sources yourself.
You need to draft a document with accurate, cited facts.
Outcome: Use Liner Write to draft, and rely on Line-by-Line Citation to verify every claim, ensuring your final piece is factually solid.
Use Cases
- Search the web with answers backed by cited sources for any question.
- Upload a PDF research paper and receive a concise summary of key points.
- Generate a deep research report on a complex topic for early-stage investigation.
- Use Liner Scholar to conduct a literature review or generate a survey.
- Write or refine documents with AI assistance in Liner Write.
- Ask daily questions and get accurate, model-agnostic answers.
- Use the Chrome extension to search on any webpage with cited results.
Models Under the Hood
as of 2026-08-22
Limitations
- Free tier includes 0 Agent credits, limiting access to premium features like Deep Research and image generation.
- Free file uploads are capped at 25MB per day, with higher limits on paid plans (up to 200MB on Max).
- Paid tiers consume credits for certain features, which may run out quickly for heavy usage.
- Accuracy claims are based on OpenAI SimpleQA tests, but no further performance details are provided.
as of 2026-08-07
Verification history
We have re-verified Liner 5 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — re-checked, vendor evidence unchanged
- — re-checked, vendor evidence unchanged
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-checked, vendor evidence unchanged
Free to cite with attribution — this page re-verifies continuously.
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published Liner tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Free
$0/mo
Ideal for
Casual users who need occasional cited answers and don't mind ads or limited daily file uploads.
What this tier adds
Starting tier with 0 Agent credits, 1 file upload/day (25MB), and ads.
Pro
$14.99/mo (billed annually)
Ideal for
Individual researchers or students who need consistent access to Deep Research, Scholar tools, and multiple AI models.
What this tier adds
Adds 1,000 Agent credits/month, 20 file uploads/day (100MB), and ad-free access to premium models.
Max
$29.99/mo (billed annually)
Ideal for
Heavy researchers and professionals who need unlimited file uploads and higher credit capacity for frequent Deep Research and Scholar tasks.
What this tier adds
Increases credits to 2,500/month and file uploads to unlimited (200MB each), plus all Pro features.
Team
$26.99/seat/mo
Ideal for
Small to mid-size teams (2-20 members) requiring centralized billing, admin controls, and data exclusion from AI training.
What this tier adds
Adds master account, dedicated workspace, admin controls, and team data training exclusion.
Enterprise
Custom
Ideal for
Large organizations needing custom governance, audit logs, and dedicated support with flexible scaling.
What this tier adds
Includes everything in Team plus dedicated manager, onboarding, audit logs, and higher discounts.
Where the pricing makes sense
The company stage and team size where Liner's pricing actually pencils out — and where peers do it cheaper.
Liner's pricing fits students and researchers who need cited answers but is pricier on a per-credit basis than Perplexity Pro's flat-rate $20/mo. For heavy research, Max at $29.99/mo may be worth it, but casual users might find cheaper alternatives like ChatGPT Plus at $20/mo.
Setup time & first value
How long it actually takes to get something useful out of Liner — broken out by persona, not the marketing-page minute.
For a student, you can start searching with cited results immediately after signing up, but need to upgrade to Pro to use Scholar tools and Deep Research (under 10 minutes). For a professional, you can get value within minutes by uploading a PDF and asking questions, though setting up teams may take a few minutes.
Resources & Guides
Tutorials & Learning
Official links
Tools that pair well with Liner
Common stack mates teams adopt alongside Liner, with the specific reason each pairing earns its keep.
Featured Head-to-Head Comparisons
Liner vs Surge Ai
If you need accurate, cited answers for research or daily queries, Liner is your tool with its credit-based freemium model. If you're a frontier AI lab training or evaluating advanced models with expert human feedback, Surge AI is purpose-built with domain experts and rigorous benchmarks. Choose Liner for consumption of verified information; choose Surge for production of high-quality AI alignment data.
Liner vs Praktika
Choose Praktika if you want to improve conversational language skills via AI role-play with instant feedback. Choose Liner if you need accurate, source-cited answers for research or fact-checking. They serve different needs entirely.
Grantable vs Liner
If you need verifiable, cited answers for academic or professional research, Liner's multi-model approach with source attribution is unmatched. But if you're a nonprofit grant writer juggling funder discovery and proposal drafting, Grantable's specialized workflow and funder matching will save you far more time. Choose Liner for research credibility, Grantable for grants management.
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