Tool profile
StrikePlagiarism: cost, fit and limits
StrikePlagiarism is a similarity checking service made in Poland by the company Plagiat.pl that produces a similarity report with an AI content detection module, grammar checking and API, LTI and LMS integrations for universities and individual users.
What to know first
StrikePlagiarism sells individuals prepaid Tokens at 2.33 EUR or 2.50 USD, each verifying 18,000 characters and valid for six months. Corporate buyers get quoted prices, with estimates published as bands per account, per document or per page. Inside the Similarity Report sits an AI module that reports a probability score and a separate indicator for machine-written text. The pages read show no free individual plan, no hosting region and no training statement.
StrikePlagiarism at a glance
| Maker | Plagiat.pl sp. z o.o., Poland |
|---|---|
| Free plan | No |
| Entry price | 2.33 EUR per token (18,000 characters) |
| API access | Yes |
| Category | Best AI Plagiarism Checkers in 2026, rank 9 of 13 |
| Website | strikeplagiarism.com |
Who StrikePlagiarism is best for
Universities with LMS systems
API, LTI and LMS integrations are listed, so an institution can route student submissions into the Similarity Report without manual uploads.
Departments that prefer per-document pricing
Corporate price bands include 2 to 5 USD or EUR per document, which suits a faculty that checks theses on a calendar.
Individuals with occasional checks
A Token costs 2.33 EUR and covers 18,000 characters, so a single article can be checked without a monthly plan.
Reviewers who want AI signals in one report
The AI module lives inside the Similarity Report, so a reviewer reads matches and the probability score in one document.
StrikePlagiarism plans and pricing
| Plan | Price | What it includes |
|---|---|---|
| Individuals (Tokens) | 2.33 EUR or 2.50 USD per Token | Each Token verifies 18,000 characters and is valid for 6 months, with payment accepted in USD, EUR, PLN and other currencies. |
| Corporate, per account | Custom quote (0.80 to 2.50 USD or EUR per user, estimated) | The price depends on the number of accounts and any extra services, so the band on the pricing page is only an estimate. |
| Corporate, per document | Custom quote (2 to 5 USD or EUR per document, estimated) | Price depends on document size, term and extra services, which suits institutions that check a fixed number of papers each year. |
| Corporate, per page | Custom quote (0.03 to 0.10 USD or EUR per page, estimated) | A page is measured in characters, and the final price depends on extra services included in the agreement. |
Checked November 2026.
What StrikePlagiarism does
- Similarity Report
- The report lists matching sources for a document and is the main output, with document databases selected per check rather than fixed for every user.
- AI content detection module
- Each document gets a probability score and a labeled indicator for machine-written text inside the report, so a reviewer sees the AI signal beside the similarity result.
- Grammar and spell checker
- A grammar and spell checker is built into the service, so an author can correct language errors in the same environment where the similarity result appears.
- API, LTI and LMS
- Integration options include an API, LTI and LMS connections, which lets a university plug the checker into its existing learning and submission systems instead of asking staff to upload each paper by hand.
- Selectable document databases
- Databases can be selected per check, which gives control over where a document is compared, though the pages read do not list the databases or say how many sources each one covers.
- GDPR-managed uploads
- The individuals pricing page states that uploads are managed under GDPR, though no hosting region, retention period for documents or certification appears on the pages read.
How StrikePlagiarism handles your data
The privacy page says communication data is kept no longer than six years from the end of the year it was received. The individuals pricing page says uploads are managed under GDPR. The pages read do not say how long uploaded documents are retained, where they are hosted, whether they train any model or which certifications apply, so the vendor's policy was not checked for those points. The operator is Plagiat.pl sp. z o.o. in Poland.
Where StrikePlagiarism falls short in practice
- Tokens expire. Tokens are valid for six months, so an occasional user who buys several at once may lose the unused ones, and the pages read mention no refund.
- No free individual plan. The individuals pricing page lists no free tier, so a buyer must pay before the first check, with no trial of the AI module described.
- Corporate prices are estimates. Corporate prices are shown as bands and need a quote, so a purchasing team cannot compare totals with another vendor without a conversation, and the final number may land outside the printed band.
Works with
Alternatives to StrikePlagiarism
StrikePlagiarism: common questions
How much does a StrikePlagiarism check cost for an individual?
An individual buys Tokens at 2.33 EUR or 2.50 USD each. One Token verifies 18,000 characters and is valid for six months. The number of Tokens needed depends on the length of the document, so a long thesis uses several.
Does StrikePlagiarism detect AI-written text?
Yes. The detection module is built into the Similarity Report and gives each document a probability score and an indicator label. The pages read give no accuracy figures, so treat the indicator as one input among several for a human reviewer to weigh.
What are the corporate prices?
Corporate pricing is a quote. The pages give estimates of 0.80 to 2.50 USD or EUR per user or author, 2 to 5 USD or EUR per document, or 0.03 to 0.10 USD or EUR per page. The final price depends on volume, term and extra services.
Which integrations does StrikePlagiarism list?
The site lists an API, LTI and LMS integrations. The pages read do not name specific platforms such as Moodle or Canvas, so ask the vendor which systems are supported and how submissions are matched to student accounts before signing.
Is there a free StrikePlagiarism plan?
No free individual plan is listed on the pricing page. Individuals buy Tokens before each check. The pages read do not describe a trial of the AI module, so ask sales whether an institution can test the service before paying.