RankDude
Updated 11/02/2026 · next update 12/01/2026

Is the AI plagiarism checker market growing or shrinking?

Miles FosterOwner and tester, RankDude

The answer▼ Shrinking

Visits, year on year
-37%
Visits, last six months
-35%
Name searches vs October 2025
-32%

Every month I add up the Google visits to the 22 AI plagiarism checker sites I track (DataForSEO estimates) and how often people in the US search for them by name (Google Ads). In October 2026 they got about 34 million visits. Grammarly alone takes 63.7% of the visits, so the totals mostly follow it. Without it, visits would be down 47.9% on a year ago instead of down 37.0%.

The total hides very different stories: one site grew 31% in a year while another lost 80% of its visits. See who grew and who shrank, the visits month by month and the name searches, plus what I expect for November 2026.

AI plagiarism checker market demand: key numbers, October 2026

Four numbers for October 2026. Visits mean visits from Google search to the 22 tracked sites. Tap one for the detail below.

  • The AI plagiarism checker market is shrinking as of October 2026.
  • The 22 AI plagiarism checker sites RankDude tracks got 34,270,367 visits from Google search in October 2026, 37% fewer visits than in October 2025.
  • People in the US searched Google for these sites by name 3,325,080 times in September 2026, 32% fewer searches than in October 2025.
  • The five most-visited AI plagiarism checker sites get 89.4% of all visits.
  • Fastest-growing AI plagiarism checker site over the year: StrikePlagiarism, +31% (10.6K to 13.9K visits a month).
  • Steepest fall over the year: Plagium, -80% (103K to 20.2K visits a month).
  • Forecast for November 2026: about 33M visits, likely between 29M and 38M.

Source: DataForSEO visit estimates and Google Ads search data, published 2 November 2026 by RankDude.

1.Are more people visiting AI plagiarism checker sites than a year ago?

Down 37% on a year ago; down 11% on September 2026

No. The 22 tracked AI plagiarism checker sites got 34,270,367 visits from Google search in October 2026. That is 37% fewer visits than in October 2025, and 11% fewer visits than in September 2026.

The highest month of the last two years was December 2024, with 64,011,993 visits; October 2026 is 47% below it. In the US, visits were 6,366,576, down 17% on a year ago.

WorldVisits a month to AI plagiarism checker sites, worldwide, two years

025M50M75M100MNov 24Jan 25Mar 25May 25Jul 25Sep 25Nov 25Jan 26Mar 26May 26Jul 26Oct 2634M
Low 32MHigh 64MAverage 50M
Hover, tap, or use the arrow keys to inspect a month

Source: DataForSEO, Google search visits, all tracked sites.

Worldwide, this month

34M

-37.0% on a year ago

United States, this month

6.4M

-17.0% on a year ago

Two-year high

64M

December 2024

US share of visits

18.6%

of worldwide visits

Miles explains

Visits are lower than a year ago and lower than in September 2026, so the fall is still going. Name searches (-32%) and Google Trends interest in the term (-49%) fell too, so people are less interested, not just finding these sites less often.

2.Are people searching for AI plagiarism checker sites by name?

Down 32% on October 2025; 3.3M name searches a month in the US

Fewer than before. People in the US searched Google for the names of the counted AI plagiarism checker sites 3,325,080 times in September 2026, 32% fewer searches than in October 2025. Someone who searches a site’s name already knows it, so this is the clearest sign of people coming back on purpose. The term “ai plagiarism checker” itself gets about 9,900 US searches a month (Google Ads, 12-month average).

USName searches a month for AI plagiarism checker sites, US

01.3M2.5M3.8M5.0MOct 25Dec 25Feb 26Apr 26Jun 26Sep 263.3M
Low 1.4MHigh 4.9MAverage 3.2M
Hover, tap, or use the arrow keys to inspect a month

Source: Google Ads via DataForSEO, to September 2026.

USMost searched AI plagiarism checker sites by name, searches a month

  1. Grammarly2.7M a month
  2. Turnitin450K a month
  3. Ahrefs40.5K a month
  4. Originality.ai33.1K a month
  5. Winston AI27.1K a month
  6. Plagiarism Detector9.9K a month

Miles explains

Name searches are down, so fewer people are coming back on purpose. Better Google rankings will not fix that.

3.Which AI plagiarism checker sites grew, and which shrank?

The five most-visited sites hold 89.4% of all visits; the ten most-visited hold 97.5%

The five most-visited AI plagiarism checker sites get 89.4% of all visits, so one of them winning or losing a big Google ranking moves the whole total. Fastest grower over the year: StrikePlagiarism, from 10,622 to 13,921 visits (+31%). Steepest fall: Plagium, from 103,357 to 20,221 visits (-80%).

Growing fastest, year on year

  1. StrikePlagiarism13.9K visits+31%
  2. Originality.ai1.0M visits+27%
  3. Compilatio229K visits+14%

Falling fastest, year on year

  1. Plagium20.2K visits-80%
  2. Smodin191K visits-77%
  3. iThenticate31.9K visits-76%
  4. Plagly11.3K visits-67%
  5. Ahrefs1.9M visits-65%

Source: DataForSEO. Sites with 5,000+ visits a year ago.