AI plagiarism checker market, October 2026
Miles FosterOwner and tester, RankDude
The market▼ Shrinking
- Visits, year on year
- -37%
- Visits vs September 2026
- -11%
- Name searches vs October 2025
- -32%
Every month I measure Google visits to the 22 AI plagiarism checker sites I track, and how often people search for them by name. In October 2026 they got about 34 million visits, 37% fewer than a year ago and 11% fewer than in September 2026.
Below: who grew fastest (one site is up 31% in a year), who sits highest on Google, where the visitors live and what comes next.
Data from DataForSEO, Tranco, Chrome UX Report and Ahrefs · not a ranking
AI plagiarism checker market: the key numbers for October 2026
Four numbers for October 2026. Visits mean visits from Google search to the tracked sites. Tap one for the detail below.
- The tracked sites got 34,270,367 visits from Google in October 2026, 37% fewer than a year ago and 11% fewer than in September 2026. 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%.
- “ai plagiarism checker” gets about 9,900 US searches a month. People searched the site names 3,325,080 times in the US in September 2026, 32% less often than in October 2025.
- 1 tracked site is on Google’s first page for “ai plagiarism checker”; the highest is Grammarly at position 1. Grammarly is the most-visited site.
- 18.6% of visits came from the US (14.1% a year ago), then India, United Kingdom and Canada. The five most-visited sites took 89.4% of all visits.
1How many visits
In plain words: These sites got fewer visits from Google than a year ago (-37%), and October 2026 was a weaker month than September 2026 (-11%). 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%.
- Visits, October 2026
- 34,270,367 (-37.0% on a year ago, -11.3% on September 2026)
- US visits
- 6,366,576 (-17.0% on a year ago)
- 24-month peak
- 64,011,993 in December 2024
WorldVisits a month to AI plagiarism checker sites, worldwide
Source: DataForSEO, Google search visits, all tracked sites.
Miles explains
Judge this line on the year, not the last dot: visits are 37% below a year ago, and 46% below the December 2024 high. One site winning or losing a ranking can swing a single month a lot.
2How many people went looking
People typed a site’s name into Google 32% less often than in October 2025 (-32%). That is the loyalty number, because nobody types a name by accident.
- Searches for "ai plagiarism checker"
- 9,900 a month in the US, 49,500 worldwide (12-month average)
- Name searches, September 2026
- 3,325,080 in the US (-31.6% since October 2025), 8,435,260 worldwide
USSearches a month for "ai plagiarism checker", United States
Source: Google Ads via DataForSEO.
USSearches a month for the site names, United States
Source: Google Ads via DataForSEO, to September 2026.
| Most searched by name, US | Searches a month |
|---|---|
 Grammarly | 2,740,000 |
 Turnitin | 450,000 |
 Ahrefs | 40,500 |
 Originality.ai | 33,100 |
 Winston AI | 27,100 |
 Plagiarism Detector | 9,900 |
 Paperpal | 6,600 |
 iThenticate | 5,400 |
Most searched by name, US
- Searches a month
- 2,740,000
- Searches a month
- 450,000
- Searches a month
- 40,500
- Searches a month
- 33,100
- Searches a month
- 27,100
- Searches a month
- 9,900
- Searches a month
- 6,600
- Searches a month
- 5,400
Ordered by US searches for the brand name in September 2026. A measured order, not a ranking.
Rising next to the term on Google Trends: “ithenticate” and “ithenticate plagiarism checker”.
Miles explains
Name searches are the number I trust most. They are down 32%, and nobody types a site’s name by accident, so this shows fewer people coming back on purpose.
3Who is on Google's first page
1 tracked site is on Google’s first page for “ai plagiarism checker”, and Grammarly holds the first position. Being on that page is the biggest single thing that decides how many visits a site gets.
Ordered by US Google position for “ai plagiarism checker”, then Tranco rank. A measured order, not a ranking.
| Site | Google US | Tranco | Move in 41 days | Search visits |
|---|---|---|---|---|
| Grammarly | 1 | 323 | ▲ 244 | 21,845,704 |
| Ahrefs | – | 2,132 | ▼ 62 | 1,879,377 |
| Turnitin | – | 6,076 | ▼ 935 | 1,307,200 |
 Copyscape | – | 25,032 | ▼ 382 | 37,526 |
 SmallSEOTools | – | 28,149 | ▼ 792 | 4,573,936 |
| Originality.ai | – | 43,366 | ▲ 266 | 1,014,712 |
| Paperpal | – | 45,674 | ▲ 6,449 | 733,563 |
| iThenticate | – | 55,173 | ▲ 5,056 | 31,851 |
 Paraphraser.io | – | 72,051 | ▼ 1,647 | 766,814 |
 Compilatio | – | 115,286 | ▼ 66,775 | 228,815 |
 Smodin | – | 121,630 | ▼ 6,077 | 191,309 |
| Plagiarism Detector | – | 121,682 | ▼ 1,717 | 427,001 |
 Prepostseo | – | 129,721 | ▲ 63 | 538,908 |
| Winston AI | – | 160,775 | ▼ 5,903 | 318,306 |
 Quetext | – | 177,495 | ▲ 11,489 | 178,553 |
Site
- Google US
- 1
- Tranco
- 323
- Move in 41 days
- ▲ 244
- Search visits
- 21,845,704
- Google US
- –
- Tranco
- 2,132
- Move in 41 days
- ▼ 62
- Search visits
- 1,879,377
- Google US
- –
- Tranco
- 6,076
- Move in 41 days
- ▼ 935
- Search visits
- 1,307,200
- Google US
- –
- Tranco
- 25,032
- Move in 41 days
- ▼ 382
- Search visits
- 37,526
- Google US
- –
- Tranco
- 28,149
- Move in 41 days
- ▼ 792
- Search visits
- 4,573,936
- Google US
- –
- Tranco
- 43,366
- Move in 41 days
- ▲ 266
- Search visits
- 1,014,712
- Google US
- –
- Tranco
- 45,674
- Move in 41 days
- ▲ 6,449
- Search visits
- 733,563
- Google US
- –
- Tranco
- 55,173
- Move in 41 days
- ▲ 5,056
- Search visits
- 31,851
- Google US
- –
- Tranco
- 72,051
- Move in 41 days
- ▼ 1,647
- Search visits
- 766,814
- Google US
- –
- Tranco
- 115,286
- Move in 41 days
- ▼ 66,775
- Search visits
- 228,815
- Google US
- –
- Tranco
- 121,630
- Move in 41 days
- ▼ 6,077
- Search visits
- 191,309
- Google US
- –
- Tranco
- 121,682
- Move in 41 days
- ▼ 1,717
- Search visits
- 427,001
- Google US
- –
- Tranco
- 129,721
- Move in 41 days
- ▲ 63
- Search visits
- 538,908
- Google US
- –
- Tranco
- 160,775
- Move in 41 days
- ▼ 5,903
- Search visits
- 318,306
- Google US
- –
- Tranco
- 177,495
- Move in 41 days
- ▲ 11,489
- Search visits
- 178,553
Source: DataForSEO (US Google positions) and Tranco, October 2026. First 15 of 22 sites shown.
Miles explains
No tracked site sits high on Google for “ai plagiarism checker”, so most visits here come from people who already know the names.
4Who grew, who faded
Biggest gain in October 2026: Yomu (+25%); biggest loss: Compilatio (-67%). Year-on-year growers are on the demand page.
Biggest moves in October 2026
| Up this month | Sep 26 | Oct 26 | Change |
|---|---|---|---|
 Yomu | 15,915 | 19,887 | +25.0% |
| Copyscape | 33,510 | 37,526 | +12.0% |
| Paraphraser.io | 752,095 | 766,814 | +2.0% |
| Originality.ai | 1,007,067 | 1,014,712 | +0.8% |
 Plagly | 11,285 | 11,292 | +0.1% |
Up this month
- Sep 26
- 15,915
- Oct 26
- 19,887
- Change
- +25.0%
- Sep 26
- 33,510
- Oct 26
- 37,526
- Change
- +12.0%
- Sep 26
- 752,095
- Oct 26
- 766,814
- Change
- +2.0%
- Sep 26
- 1,007,067
- Oct 26
- 1,014,712
- Change
- +0.8%
- Sep 26
- 11,285
- Oct 26
- 11,292
- Change
- +0.1%
| Down this month | Sep 26 | Oct 26 | Change |
|---|---|---|---|
| Compilatio | 698,531 | 228,815 | -67.2% |
 BrandWell | 35,442 | 17,529 | -50.5% |
| Turnitin | 1,705,194 | 1,307,200 | -23.3% |
| Smodin | 244,132 | 191,309 | -21.6% |
| Winston AI | 401,043 | 318,306 | -20.6% |
| Prepostseo | 676,073 | 538,908 | -20.3% |
Down this month
- Sep 26
- 698,531
- Oct 26
- 228,815
- Change
- -67.2%
- Sep 26
- 35,442
- Oct 26
- 17,529
- Change
- -50.5%
- Sep 26
- 1,705,194
- Oct 26
- 1,307,200
- Change
- -23.3%
- Sep 26
- 244,132
- Oct 26
- 191,309
- Change
- -21.6%
- Sep 26
- 401,043
- Oct 26
- 318,306
- Change
- -20.6%
- Sep 26
- 676,073
- Oct 26
- 538,908
- Change
- -20.3%
Brand demand, since October 2025
| Searched less | Oct 25 | Sep 26 | Change |
|---|---|---|---|
| Yomu | 1,600 | 260 | -83.7% |
| Copyscape | 4,400 | 1,300 | -70.5% |
| Smodin | 3,600 | 1,300 | -63.9% |
| Quetext | 6,600 | 2,900 | -56.1% |
| Plagiarism Detector | 22,200 | 9,900 | -55.4% |
| Winston AI | 60,500 | 27,100 | -55.2% |
Searched less
- Oct 25
- 1,600
- Sep 26
- 260
- Change
- -83.7%
- Oct 25
- 4,400
- Sep 26
- 1,300
- Change
- -70.5%
- Oct 25
- 3,600
- Sep 26
- 1,300
- Change
- -63.9%
- Oct 25
- 6,600
- Sep 26
- 2,900
- Change
- -56.1%
- Oct 25
- 22,200
- Sep 26
- 9,900
- Change
- -55.4%
- Oct 25
- 60,500
- Sep 26
- 27,100
- Change
- -55.2%
Source: Google Ads via DataForSEO.
5Where the visitors live
About 19 of every 100 visits come from the United States.
- US share of visits
- 18.6% (14.1% a year ago)
- Largest outside the US
- India, United Kingdom and Canada
- US share of "ai plagiarism checker" searches
- 20%
USShare of visits that come from the US (%)
US share of worldwide search visits, month by month.
| Country | Search visits a month | Share of the measured countries |
|---|---|---|
| India | 5,821,049 | 68.3% |
| United Kingdom | 992,075 | 11.6% |
| Canada | 836,939 | 9.8% |
| Australia | 478,515 | 5.6% |
| France | 160,411 | 1.9% |
| Brazil | 120,717 | 1.4% |
| Germany | 114,685 | 1.3% |
Country
- India
- Search visits a month
- 5,821,049
- Share of the measured countries
- 68.3%
- United Kingdom
- Search visits a month
- 992,075
- Share of the measured countries
- 11.6%
- Canada
- Search visits a month
- 836,939
- Share of the measured countries
- 9.8%
- Australia
- Search visits a month
- 478,515
- Share of the measured countries
- 5.6%
- France
- Search visits a month
- 160,411
- Share of the measured countries
- 1.9%
- Brazil
- Search visits a month
- 120,717
- Share of the measured countries
- 1.4%
- Germany
- Search visits a month
- 114,685
- Share of the measured countries
- 1.3%
Source: DataForSEO, October 2026.
Miles explains
The US is the single biggest market, but only about 19 in every 100 visits. India alone is 68.3% of the countries I measure outside it.
6Links and ratings
The tracked sites had 364,856 referring domains between them in October 2026; this is the first reading, so there is no year-on-year figure yet. The average Domain Rating is 68. Ahrefs has the strongest link profile at DR 91.
| By Domain Rating (Ahrefs) | DR |
|---|---|
| Ahrefs | 91 |
| Grammarly | 90 |
| Copyscape | 85 |
| Turnitin | 84 |
| SmallSEOTools | 81 |
| Originality.ai | 79 |
| iThenticate | 77 |
| BrandWell | 74 |
By Domain Rating (Ahrefs)
- DR
- 91
- DR
- 90
- DR
- 85
- DR
- 84
- DR
- 81
- DR
- 79
- DR
- 77
- DR
- 74
| By referring domains | Domains |
|---|---|
| Ahrefs | 107,359 |
| Grammarly | 96,256 |
| Copyscape | 41,204 |
| Turnitin | 31,281 |
| SmallSEOTools | 16,581 |
| Originality.ai | 11,331 |
| iThenticate | 8,428 |
| Prepostseo | 7,592 |
By referring domains
- Domains
- 107,359
- Domains
- 96,256
- Domains
- 41,204
- Domains
- 31,281
- Domains
- 16,581
- Domains
- 11,331
- Domains
- 8,428
- Domains
- 7,592
Source: DataForSEO and Ahrefs, October 2026.