Everything Noplag does.
Noplag brings plagiarism detection, AI-content detection, and paraphrase detection together in a single pass — built on an open-source engine you can audit or self-host, a multilingual corpus, source-linked reports, and a developer API. Here's everything it does, with a link to go deeper on each.
Plagiarism detection
A retrieval cascade built to layer verbatim, paraphrase, and semantic matching. v1.0 ships winnowing fingerprints plus the live-web layer, which find verbatim and near-verbatim copying across billions of sources. MinHash LSH (v1.1) and vector reranking (v1.2) follow.
Learn moreAI-content detection
Coming soon: flags ChatGPT, Claude, and Gemini text as a separate signal — with published ESL false-positive rates. A signal, not a verdict.
Learn moreParaphrase detection
Citation classification separates quoted and cited material from uncited copying. Sentence embeddings and LSH, which extend this to reworded passages, are on the roadmap for v1.1 and v1.2.
Learn moreMultilingual
Detection calibrated for English, Spanish, Portuguese, Polish, and Ukrainian at launch, with more languages rolling out. Detection quality is benchmarked on PAN-PC-11; per-language evaluation is on the roadmap.
Five-tier corpus
Open web, Common Crawl, Wikipedia, academic indexes, the Noplag Database, and your own folders — toggle any combination.
Learn moreLive Web search
Real-time SERP verification against the most current pages, on Premium and Enterprise.
Learn moreOpen-source engine
Apache 2.0 — read it, fork it, and audit the exact algorithm that produced your score.
Learn moreSelf-hosting
Run the whole engine on your own hardware for air-gapped or EU-residency deployments.
Learn moreDeveloper API
REST and OpenAPI, webhooks, and SDKs — the same engine that powers the dashboard.
Learn morePrivacy by default
Documents never train models and never cross accounts. EU residency and one-click erasure.
Learn moreSource-linked reports
Every match shows its source, similarity score, and exact overlap. Export to PDF in two clicks.
LMS integrations
Canvas, Moodle, Blackboard, and Brightspace via LTI 1.3 — checks tied to each assignment.
Learn moreCan Noplag do that?
Can Noplag check for plagiarism and AI-generated text in one pass?
Plagiarism checking is live today — every match links to its source. AI-content detection is coming soon: a single submission will return a separate AI-content signal alongside the plagiarism report, never conflated, shipping with published ESL false-positive rates.
What languages does Noplag support?
Detection is calibrated for English, Spanish, Portuguese, Polish, and Ukrainian at launch, with more languages rolling out. Detection quality is benchmarked on PAN-PC-11; per-language evaluation is on the roadmap. Coverage is strongest on European languages.
Does Noplag have an API?
Yes — a REST API with an OpenAPI spec, webhooks, and SDKs, running the same engine that powers the dashboard. It's available on paid tiers; the API page lists endpoints, limits, and quickstarts.
Can I run Noplag on my own servers?
Yes. The detection engine is Apache 2.0, so you can self-host it via Docker for air-gapped, on-prem, or EU-residency deployments — the same algorithm as the cloud, on your own hardware.
Which LMSs does Noplag integrate with?
Canvas, Moodle, Blackboard, and Brightspace via LTI 1.3 — checks run against each assignment, and scores pass back to the gradebook.
Check your first document in under a minute.
No card, no signup wall. The free tier runs forever — see the report shape before you decide anything.