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AI Writing Comparison

Lex vs. Paperpal

At a glance

At a glance

Lex

Best for

Best for writers who want a clean editor with AI feedback built in.

  • Freelancers
  • Small and mid-sized

Paperpal

Best for

Best for researchers and students who write in Word, Google Docs or Overleaf and need submission checks before a journal deadline.

  • Freelancers
  • Small and mid-sized

Cataleo does not name a winner. Both statements come from the vendors themselves.

Full Comparison

Criterion Lex Paperpal
Starting price Not stated Free tier; Prime from $12 / month, Pro from $29 / month Prime is $144 per year ($12 per month billed annually) or $25 billed monthly. Pro is $348 per year ($29 per month billed annually) or $59 billed monthly.
Free trial Free plan available Free plan with 200 language suggestions per month and 5 generative AI uses per day
Commercial use Yes Not stated
Output Written documents Edited academic text, citations and references, plus submission readiness checks
API Yes, a documented REST API with bearer-token keys generated in account settings No, it is delivered as plugins for Microsoft Word, Google Docs, Overleaf and Chrome plus a web editor
Content types Documents, from quick notes to long drafts Academic manuscripts, theses and essays
Brand voice Yes, Style Guides learn your voice from writing samples you supply, with larger guides on the paid plan No brand voice profile to configure. The target register is fixed to academic writing, and the nearest equivalent is the manuscript checker's 30+ pre-submission checks against journal requirements, covering language and grammar, references, structure and counts, figures and tables, disclosures and metadata
Content scoring No score and no readability rating. Lex answers with written feedback on a draft, and the published feature list carries nothing that returns a number Yes, submission readiness checks covering plagiarism and similarity, AI pattern detection, reference verification and journal fit
Drafting tools Yes, AI feedback on drafts, rewriting, brainstorming, word-choice commands and title suggestions Yes, AI writing and essay writer, paraphrasing and sentence rewriting, academic translation, summarizer, PDF chat and reference finder
Templates Shared templates and prompts, on the Lex Teams add-on Yes, template-based writing assistance
Team workflows Yes, real-time collaboration, a comment system and version control Separate offerings for universities and publishers
Deployment Cloud (SaaS), Browser-based Cloud (SaaS), Browser-based
Support more entries Email helpdesk, Community forum Email helpdesk
Onboarding Documentation and knowledge base Documentation and knowledge base
Company size Freelancers, Small and mid-sized Freelancers, Small and mid-sized
Integrations Not stated Microsoft Word, Google Docs, Overleaf, Google Chrome

Compare more tools

Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.

The short version

Key Differences

  • Free trial Lex Free plan available Paperpal Free plan with 200 language suggestions per month and 5 generative AI uses per day
  • Support Lex Email helpdesk, Community forum Paperpal Email helpdesk
  • Output Lex Written documents Paperpal Edited academic text, citations and references, plus submission readiness checks
  • API Lex Yes, a documented REST API with bearer-token keys generated in account settings Paperpal No, it is delivered as plugins for Microsoft Word, Google Docs, Overleaf and Chrome plus a web editor
  • Content types Lex Documents, from quick notes to long drafts Paperpal Academic manuscripts, theses and essays

Every line is one datapoint from the table above, picked automatically. Nothing here is written text.

The trade-offs

Strengths and Limitations

Lex

Strengths

  • Distraction-free editor with AI feedback built into the document
  • Real-time collaboration and comments included on the free plan
  • Version control to compare alternative phrasings

Limitations

  • No SEO or content-scoring features
  • Fewer marketing templates than dedicated copy tools
  • The largest AI models require the paid plan

Paperpal

Strengths

  • Add-ins for Microsoft Word, Google Docs and Overleaf, so writing stays where it already is
  • Grammar checker trained on scholarly writing
  • Reference verification flags broken links and AI-hallucinated references
  • Free plan includes the submission readiness checks

Limitations

  • Free plan allows only 5 uses of the generative AI features per day
  • Monthly billing costs roughly twice the annual rate on both paid plans

Plans

Pricing

Lex

  • Free Free Includes real-time sharing and collaboration, on smaller AI models.
  • Lex Pro Not stated Access to the largest AI models, larger Style Guides, early access to new features, the iOS app and priority support.
  • Lex Teams Not stated An add-on alongside Pro: unlimited documents in shared folders, plus shared templates and prompts.
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Paperpal

  • Free $0 200 language suggestions per month, 5 generative AI uses per day, submission readiness checks.
  • Prime $12 Per month billed annually ($144 per year). $25 billed monthly.
  • Pro $29 Per month billed annually ($348 per year). $59 billed monthly.
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What users say

Review Scores · opens after launch

Lex

Ease of use
Not rated yet
User interface
Not rated yet
Onboarding
Not rated yet
Support and service
Not rated yet
Value for money
Not rated yet
Features
Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

Paperpal

Ease of use
Not rated yet
User interface
Not rated yet
Onboarding
Not rated yet
Support and service
Not rated yet
Value for money
Not rated yet
Features
Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

Where this comes from

Where this comes from

Lex https://lex.page · checked against the official source on 2026-09-03

Paperpal https://paperpal.com · no check date recorded yet

This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.