Copyleaks

Copyleaks provides AI-based text analysis for originality, intellectual property protection and academic integrity, serving both educational institutions and businesses. Its original function was plagiarism detection: submitted text is compared against a very large index of web pages, academic papers, published works, internal document repositories and previously submitted student work, and matching passages are identified with their sources and a similarity score. Detection works across more than a hundred languages and includes cross-language matching, catching material translated from another language — a technique that defeats simpler tools — along with paraphrase detection that recognises reworded content rather than only verbatim copying.

The platform's second major capability, now equally prominent, is AI-generated content detection, identifying text produced by large language models and distinguishing it from human writing, including cases where AI output has been paraphrased or partially edited to evade detection. This has become central for educators assessing student submissions and for publishers and employers verifying that commissioned work is genuinely original. Reporting shows which passages are flagged and why, with confidence indicators, and the company emphasises transparency and an ethical framing around how results should be interpreted — an important point, since detection outputs are probabilistic and consequential. Additional capabilities include source code plagiarism detection across programming languages, useful in computer science education and software audit, and writing assistance covering grammar and style. Delivery options span a web application, an LMS integration for Canvas, Moodle, Blackboard, Google Classroom and others so submissions are checked automatically within existing assignment workflows, browser extensions, and a comprehensive API for embedding checks into publishing platforms, content management systems and internal tools. Enterprise use cases include protecting intellectual property, verifying supplier and freelancer content, and monitoring for unauthorised reproduction of owned material online. A free version and free trial are available, with paid plans from around USD 7.99 per month.