Tool profile
Plagiarism Checker X: cost, fit and limits
Plagiarism Checker X is a plagiarism and AI content detection tool made by Plagiarism Checker X, LLC in the United States that runs as a Windows desktop app with cloud access, sold through monthly plans, a free Basic tier and one-time licences.
What to know first
Plagiarism Checker X offers a free Basic plan limited to 20 searches a day, monthly plans from $14 (Personal) to $99 (Business), and a one-time Professional licence at $39.95 that includes a year of maintenance. AI and plagiarism words share one allowance on each paid plan. The Windows app is the main route and a cloud option exists. The pages read show no public API and no retention or hosting details.
Plagiarism Checker X at a glance
| Maker | Plagiarism Checker X, LLC, United States |
|---|---|
| Free plan | Yes |
| Entry price | $14 per month (Personal) |
| API access | No |
| Category | Best AI Plagiarism Checkers in 2026, rank 10 of 13 |
| Website | plagiarismcheckerx.com |
Who Plagiarism Checker X is best for
Windows desktop users
The Windows app is the recommended route, and a one-time licence means the software can be used without a recurring subscription.
Students who check occasionally
The free Basic plan allows 20 searches a day in more than 20 languages, so light use costs nothing and a student can test the report layout first.
Small teams
Business at $99 a month gives 350,000 words, 10 team seats, collaboration and a logo on reports, which suits a small writing agency.
Reviewers comparing two texts
A side-by-side difference view of two texts helps a reviewer who holds both the draft and a suspected source compare a suspect passage with that source directly, line by line.
Plagiarism Checker X plans and pricing
| Plan | Price | What it includes |
|---|---|---|
| Basic | Free | Limited words, a daily search limit of 20 and support for more than 20 languages, for light testing without payment. |
| Personal | $14 per month | 50,000 AI and plagiarism words, 50,000 AI assistant words, grammar and readability checks, detailed reports and cloud access. |
| Professional | $29 per month | 100,000 AI and plagiarism words, 100,000 AI assistant words, bulk upload, a saved workspace and PDF export of reports. |
| Business | $99 per month | 350,000 AI and plagiarism words, 10 team seats, team collaboration and your logo on reports, billed monthly and cancellable. |
| Professional (one-time) | $39.95 | Pay once and use forever with one user licence and a one-year maintenance plan included for updates. |
Checked November 2026.
What Plagiarism Checker X does
- AI Content Detector
- An AI Content Detector is listed in the site menu, and AI words count against the same allowance as plagiarism words on each paid plan.
- Side-by-side comparison
- A difference view puts two texts next to each other, which is useful when you hold both the draft and the suspected source and want to see exactly which passages differ between them.
- Bulk comparison and upload
- Paid plans support bulk comparison and bulk upload, which suits a reviewer who has a whole folder of documents to check in one session and does not want to submit each file separately.
- Readability and grammar
- A readability checker and grammar checks are included, so an author can adjust the text after seeing the report without leaving the product, though the pages read do not describe how deep those checks go.
- PDF reports and workspace
- Verification reports can be exported as PDF and a workspace saves past work, which helps a team keep evidence of the checks it ran and share the reports with an editor or a supervisor.
- Desktop plus cloud
- A Windows desktop app is the recommended route and cloud access is listed as an option, so the product works in browsers on other systems.
How Plagiarism Checker X handles your data
The privacy policy says Plagiarism Checker X follows the GDPR. The pages read do not state a retention period, a hosting region, whether uploaded documents train any model, or any certification, so the vendor's policy was not checked for those points. Terms and conditions, an about page and a contact page are published. A buyer who uploads sensitive documents should ask where processing happens, particularly if the cloud route is used instead of the desktop app.
Where Plagiarism Checker X falls short in practice
- Updates stop after a year. On one-time licences, software updates are limited to 365 days under the maintenance plan, so long-term use needs a renewal of the plan or acceptance of running an old version without new features or fixes.
- No public API. No public API was seen on the pages read, so a platform that wants to send documents automatically has no listed route and would have to rely on manual bulk uploads.
- Windows first. The desktop app is Windows software, so Mac users depend on the cloud route and should test it on the free plan before paying for a year of any subscription.
Works with
Alternatives to Plagiarism Checker X
Plagiarism Checker X: common questions
Is Plagiarism Checker X free?
A free Basic plan exists with limited words and a daily search limit of 20. It supports more than 20 languages. Paid monthly plans start at $14, and a one-time Professional licence costs $39.95. Free use suits testing, not a full thesis.
What does the one-time licence include?
The Professional one-time licence costs $39.95, pays once, covers one user and includes a one-year maintenance plan. Software updates are limited to 365 days under that plan, so buyers who want updates beyond the first year should check the renewal price.
Does Plagiarism Checker X detect AI text?
An AI Content Detector is listed in the site menu, and paid plans count AI words in the same allowance as plagiarism words. The pages read give no accuracy data, so test sample text you know the origin of before using results for decisions.
Can I run Plagiarism Checker X on a Mac?
The recommended route is the Windows desktop app, with cloud access listed as an option. The pages read do not describe a Mac app. A Mac user should test the cloud route on the free Basic plan before committing to a paid plan.
How many words do the monthly plans include?
Personal includes 50,000 AI and plagiarism words and 50,000 AI assistant words. Professional includes 100,000 of each, and Business includes 350,000 AI and plagiarism words with 10 team seats. Plagiarism and AI words share one allowance, so a long document checked for both uses the allowance twice.