Codequiry vs Noplag Engine

Codequiry checks submitted source code for plagiarism and AI-generated code, helping educators verify that student work is their own. It compares submissions with peer work, web sources, and historical material. The company says more than 20 analysis engines examine code structure and logic, not just textual matches, and that the system flags code associated with ChatGPT, GitHub Copilot, Claude, and Gemini. It supports more than 65 programming languages, including Python, Java, C/C++, JavaScript, C#, Go, and Rust. Instructors can review similarity scores and side-by-side matches, with matching lines highlighted. Grow includes a web dashboard, desktop client, and API/CLI access; all three listed plans include unlimited MCP calls. Advanced includes LMS integrations, while Scale offers custom LMS and SIS integrations built to spec. The pricing page states FERPA and GDPR compliance, SOC 2 Type II certification, TLS 1.3 encryption, and AES-256 encryption at rest. Uploaded code on plans without Rapid may be retained indefinitely in an anonymized comparison corpus and cannot be deleted on request. Grow costs €25.76 a month; a one-day trial is available and there is no free plan.

Noplag Engine is an open-source plagiarism detection tool that checks text for verbatim and near-verbatim matches against a corpus you control. It uses winnowing fingerprints to find candidate sources, then aligns matching character ranges. Reports show similarity by source, passage offsets, and coverage accounting. It accepts.txt,.md,.pdf, and.docx files, with folder ingestion and HTTP uploads, and exposes a /v1 API for checks, reports, uploads, progress events, and corpus management. The API ships without authentication. The open-source engine searches a local corpus; the hosted product also searches the live web. It does not detect paraphrase, semantic similarity, or AI-written text. The engine can run on your own hardware with Docker Compose under the Apache 2.0 license. The repository lists Python 3.12 or newer for development and PostgreSQL in its Docker Compose setup. The free hosted plan costs nothing and allows 3 checks per month, while self-hosting permits unlimited local checks. Pro costs $9.99 a month and Premium costs $19.99 a month; Enterprise pricing is custom.