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Head to head · 2026

ChatDOC vs Liner

Pricing, free plans, ratings, features, pros and cons, side by side. Where one comes out ahead, we mark it.

ChatDOC

Chat with PDFs where every answer cites the passage it came from, backed by its own…

3.9Free

Visit ChatDOC (opens ChatDOC in a new tab)

Liner

Started as a web highlighter in 2015, later added AI research search

4.2$12/mo

Visit Liner (opens Liner in a new tab)

Who comes out ahead

Based only on the facts in our directory. The right pick still depends on the job you need done.

  • Lower starting price

    Not comparable

    Not comparable: ChatDOC does not list a price

  • Free plan

    Tie

    Both have one

  • Higher rating

    Liner

    3.9 against 4.2

  • Same job?

    Yes

    Both are Research tools

Side by side

Compared onChatDOCLiner
Our rating3.94.2Better
Starts atFree$12/mo
Free planYesYes
CategoryResearchResearch
PlansFree
  • Free$0/mo
  • Pro$17.99/mo
  • Max$35.99/mo
Key features
  • Answers cite the source passage in the document
  • Standalone PDF parser available as an API
  • ChatPaper for academic reading
  • Chrome and Edge extensions
  • Unlimited pages, files and folders on paid tiers
  • Browser-based highlighting and annotation across general web content and PDFs
  • AI search grounded in a user's own saved highlights
  • Free tier for standard use
  • Operating since 2015, older than most competitors in this category
  • Not scoped only to academic content
Pros
  • Visible citations make answers checkable rather than merely plausible
  • Separate parser API signals effort went into the hard foundation
  • Handles document collections, not one file at a time
  • Broader scope than academic-only competitors, covers general web reading too
  • Long operating history refining the annotation experience specifically
  • Free tier available for standard use
Cons
  • A citation proves provenance, not correct interpretation
  • Complex tables and scans remain hard for any parser
  • Unlimited usage sits behind the paid tiers
  • Less specialized for formal academic citation workflows than research-specific tools
  • More features require a paid plan
  • Highlighter-first design may feel less structured than a dedicated research platform
CompanyChatDOCLINER, founded 2015

Prices come from each vendor's pricing page, last checked 20260901. Check the vendor before you buy.

FAQ

Questions people ask

Is ChatDOC better than Liner?

In our reviews ChatDOC scores 3.9 and Liner scores 4.2. The better pick depends on the job. ChatDOC: Chat with PDFs where every answer cites the passage it came from, backed by its own document parser and API. Liner: Started as a web highlighter in 2015, later added AI research search.

Which is cheaper, ChatDOC or Liner?

ChatDOC: free. Liner: from $12/mo.

Do ChatDOC and Liner have free plans?

Yes, both have a free plan.

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