How was this comparison made?

On 17 October 2026 we read each company’s own plan, pricing and help pages and quoted their figures; every page is linked under the sources. We did not run test papers through the other checkers, so this compares what each plan includes, not how well each one detects copying. A monthly allowance resets each month; Scribbr’s prices are per check. Labrix counts a page as 250 words. A full report here means every matched passage shown with its source.

Which free plagiarism checker gives the most words?

Of the five checked on 17 October 2026, Labrix’s free account (30 pages, about 7,500 words a month, with the full report) and Paperpal’s free plan (7,000 words a month, with a standard report) give the most. Grammarly and QuillBot leave plagiarism checking out of their free plans, and Scribbr charges per check.

Will my score match Turnitin’s?

No checker matches Turnitin exactly, because each compares against its own databases. Use a pre-submission check to find and fix overlap, not to predict an institution’s number.

Is my paper added to a database?

Labrix never adds your draft to its comparison corpus, and Scribbr says the same of its checker. Read each tool’s terms before uploading unpublished work.

All features

Source-backed comparison

Free plagiarism checkers, compared

What each checker gives you for free, what paying adds, and what your paper is compared against, from each company’s own pages.

Feature claims reviewed 17 October 2026

Compare the work, not the brand

Each description reflects the vendor's current public documentation. Availability can still vary by plan.

Workflow comparison for Labrix, Grammarly, QuillBot, Scribbr, Paperpal
Workflow	Labrix	Grammarly	QuillBot	Scribbr	Paperpal
Free plan	30 pages (about 7,500 words) a month with the full report after you verify your email; 500 words a day without an account	Not included: the plans page lists catching plagiarism as unavailable on Free	Not included: its help centre says the Plagiarism Checker needs Premium	No free check: each check is priced by document length	7,000 words a month with a standard report
Paid allowance	Go: 100 pages (25,000 words) a month; Max: 200 pages (50,000 words), full report on every plan	Included in Plus ("Detect plagiarism and AI generated text")	Premium: 25,000 words a month, with extra words sold in packs (25,000 for $8.95)	$19.95 up to 7,499 words, $29.95 up to 49,999 and $39.95 above, per check, not a subscription	Prime: 10,000 words a month; Pro: 30,000 words a month, both with a full report
Compared against	About 214 million open research papers, abstracts, Wikipedia articles and books, plus a search of the web	Over 16 billion web pages and academic papers in ProQuest’s databases	Not stated in the sources checked	Billions of web pages and millions of scholarly publications	99 billion web pages, including hundreds of millions of open-access research articles

Free plan

Labrix: 30 pages (about 7,500 words) a month with the full report after you verify your email; 500 words a day without an account
Grammarly: Not included: the plans page lists catching plagiarism as unavailable on Free
QuillBot: Not included: its help centre says the Plagiarism Checker needs Premium
Scribbr: No free check: each check is priced by document length
Paperpal: 7,000 words a month with a standard report

Paid allowance

Labrix: Go: 100 pages (25,000 words) a month; Max: 200 pages (50,000 words), full report on every plan
Grammarly: Included in Plus ("Detect plagiarism and AI generated text")
QuillBot: Premium: 25,000 words a month, with extra words sold in packs (25,000 for $8.95)
Scribbr: $19.95 up to 7,499 words, $29.95 up to 49,999 and $39.95 above, per check, not a subscription
Paperpal: Prime: 10,000 words a month; Pro: 30,000 words a month, both with a full report

Compared against

Labrix: About 214 million open research papers, abstracts, Wikipedia articles and books, plus a search of the web
Grammarly: Over 16 billion web pages and academic papers in ProQuest’s databases
QuillBot: Not stated in the sources checked
Scribbr: Billions of web pages and millions of scholarly publications
Paperpal: 99 billion web pages, including hundreds of millions of open-access research articles

Start with your bottleneck

Several tools may fit the same researcher. The strongest choice depends on the next meaningful deliverable.

Labrix fits best when

You want a full report on a research paper every month without paying, with every match shown beside its source text and quoted, cited and reference-list matches counted apart. Its corpus is open research, Wikipedia and books plus a web search, smaller than the commercial databases.

Scribbr or Paperpal fit best when

You need the largest database before a high-stakes submission. Both compare against billions of web pages and scholarly publications; Scribbr charges per document and Paperpal includes a monthly allowance.

Grammarly or QuillBot fit best when

You already pay for their writing tools and want the plagiarism check inside the same subscription.

Check the sources

We link to official product pages and documentation so you can verify the scope before choosing a plan.

Last reviewed 17 October 2026. Plan limits change often: each figure is quoted from the vendor’s own page, linked here.

Grammarly plansPlagiarism checking unavailable on Free; included in Plus Grammarly plagiarism checkerOver 16 billion web pages and ProQuest’s academic databases QuillBot Help CenterNot on the free plan; Premium 25,000 words a month; word packs Scribbr plagiarism checkerPer-document prices and the privacy guarantee Paperpal plagiarism checkerFree 7,000 words a month, Prime and Pro allowances, database size Labrix pricingFree, Go and Max page allowances

Common questions

How was this comparison made?: On 17 October 2026 we read each company’s own plan, pricing and help pages and quoted their figures; every page is linked under the sources. We did not run test papers through the other checkers, so this compares what each plan includes, not how well each one detects copying. A monthly allowance resets each month; Scribbr’s prices are per check. Labrix counts a page as 250 words. A full report here means every matched passage shown with its source.
Which free plagiarism checker gives the most words?: Of the five checked on 17 October 2026, Labrix’s free account (30 pages, about 7,500 words a month, with the full report) and Paperpal’s free plan (7,000 words a month, with a standard report) give the most. Grammarly and QuillBot leave plagiarism checking out of their free plans, and Scribbr charges per check.
Will my score match Turnitin’s?: No checker matches Turnitin exactly, because each compares against its own databases. Use a pre-submission check to find and fix overlap, not to predict an institution’s number.
Is my paper added to a database?: Labrix never adds your draft to its comparison corpus, and Scribbr says the same of its checker. Read each tool’s terms before uploading unpublished work.

Labrix and Paperpal

Check your paper now

Up to 500 words with no account, or see a sample report first.

Run a free check