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Head to head · 2026

Liner vs Petal

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

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)

Petal

MIT-founded document platform with a free reference-manager component

4.2$4/mo

Visit Petal (opens Petal 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

    Petal

    From $4/mo against from $12/mo

  • Free plan

    Tie

    Both have one

  • Higher rating

    Tie

    4.2 against 4.2

  • Same job?

    Yes

    Both are Research tools

Side by side

Compared onLinerPetal
Our rating4.24.2
Starts at$12/mo$4/moBetter
Free planYesYes
CategoryResearchResearch
Plans
  • Free$0/mo
  • Pro$17.99/mo
  • Max$35.99/mo
From $4/mo
Key features
  • 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
  • Chat interface across a shared, uploaded document library
  • Petal CITE, a free cloud-native reference manager
  • Founded in 2018 by MIT graduate researchers
  • Used by research labs, university faculty, and industry teams
  • Browser plugin for adding documents directly
Pros
  • 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
  • Petal CITE provides genuinely free reference management, not just a limited trial
  • Built with research labs and teams in mind, not just individual users
  • MIT origin reflects real academic research-workflow experience
Cons
  • 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
  • More features require a paid plan
  • Team and lab-oriented design may be more structure than a solo researcher needs
  • Less well known than larger competitors in this category
CompanyLINER, founded 2015Paladin Max, Inc., founded 2018

Prices come from each vendor's pricing page, last checked 20260703. Check the vendor before you buy.

FAQ

Questions people ask

Is Liner better than Petal?

In our reviews Liner scores 4.2 and Petal scores 4.2. The better pick depends on the job. Liner: Started as a web highlighter in 2015, later added AI research search. Petal: MIT-founded document platform with a free reference-manager component.

Which is cheaper, Liner or Petal?

Petal has the lower starting price: from $12/mo for Liner and from $4/mo for Petal.

Do Liner and Petal have free plans?

Yes, both have a free plan.

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