PlagiarismCheck.org
Verified Oct 15, 2026 ActiveSimilarity report and AI-text detection in one submission, wired into the usual school LMS platforms
Listed on EffectHub ·
Pricing
- Pricing model
- Paid
The pricing page shows Advanced and Pro institutional tiers as request-a-quote only; the individual and AI-checker tabs load their prices by script and showed no figures in a direct read, and the $2.08 a month entry price previously quoted could not be confirmed on a vendor page. Third-party price lists were not used.
Use tool ↗About PlagiarismCheck.org
PlagiarismCheck.org has run a similarity checker since 2015 and has bolted an AI-writing detector, TraceGPT, onto the same submission. One upload returns both a source-match report and a sentence-level estimate of which passages read as machine-written, scored on perplexity and burstiness. Documents of up to about 97 pages are accepted and images can be run through OCR first. The buyer is mostly education: there are plugins for Canvas, Moodle, Google Classroom, Schoology, Brightspace, Blackboard and Populi, a Google Docs add-on, a Chrome extension and an API for business use. Institutional plans are quote-only; individuals get published subscription prices and there is no free AI check.
- Platforms
- Web · Chrome extension · API
- API
- Yes
- Last verified
- Oct 15, 2026
Verified sources
- Pricing page lists Advanced and Pro institutional plans with Request quote buttons, LMS integration with Google Classroom, Moodle and Canvas, Fingerprint authorship verification and a 99.99% uptime line; no individual prices were visible (15 October 2026)plagiarismcheck.org ↗
- Site navigation lists TraceGPT AI detection, a plagiarism check API, a Google Docs add-on, a Chrome extension and integrations with Canvas, Moodle, Google Classroom, Schoology, Brightspace, Blackboard and Populi; footer reads © 2015 — 2026 PlagiarismCheck.org (15 October 2026)plagiarismcheck.org ↗
Is PlagiarismCheck.org legit?
We don’t label tools safe or unsafe. Below are the records we checked ourselves, each with the date we read it.
- Domain registered
- Feb 23, 2010 (16 years ago)Registry record (RDAP), registrar Cloudflare, Inc., looked up Sep 6, 2026
- TLS certificate
- Issued by Google Trust Services, valid until Nov 23, 2026Seen in our own connection to the site on Oct 15, 2026
- Last checked
- Oct 15, 2026The site answered
- On the market since
- 2015The vendor's own material, read by us
- Operated by
- PlagiarismCheck.orgOur research, card verified Oct 15, 2026
Pros & cons of PlagiarismCheck.org
The selling point is that one submission answers both questions a teacher has — was this copied, and was this generated — instead of running two services. Ten years of operation and real LMS plugins put it ahead of the many single-page detectors that appeared in 2023. Treat the accuracy claim with the scepticism every AI detector deserves: the underlying signals are statistical and non-native writers get flagged disproportionately across this whole category.
Pros
- Plagiarism and AI detection run on a single upload rather than two separate tools
- Sentence-level output shows which passages triggered the score, not just a document percentage
- Genuine LMS integrations across seven platforms, plus a Google Docs add-on and Chrome extension
- OCR handles scanned or photographed submissions
- Documented API for business use
Cons
- The published '99% accuracy' figure is the vendor's own and is not independently verified
- Institutional pricing is quote-only; the pricing page shows no numbers at all
- No company jurisdiction is disclosed, which matters for student-data processing
- AI detectors as a class produce false positives on formulaic and non-native writing
Best for
- Teachers and departments already inside Canvas, Moodle or Google Classroom
- Editors who need a similarity report and an AI-likelihood read in the same pass
- Institutions that need OCR because submissions arrive as photographs
Not for
- Anyone wanting a free AI check — the detector is behind a paid plan
- High-stakes disciplinary decisions taken on a detector score alone
Watch out: A detector score is a probability, not proof of authorship; several universities have retreated from acting on these numbers unsupported.
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PlagiarismCheck.org head-to-head
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