Copyleaks

Copyleaks is a web platform and API for educators, enterprises, and individuals who need to detect AI-generated text and plagiarism to verify originality and protect intellectual property.

Key capabilities include:

• AI content detection across 30+ languages, designed to identify text from models such as ChatGPT, Gemini, Claude, and others, including content that is mixed with human writing, paraphrased, or translated
• Plagiarism checking for duplicate content and paraphrasing, plus source code plagiarism detection to support code governance and compliance
• Workflow integrations via API, LMS integrations, a browser extension, and a Google Docs add-on
• A free online AI checker that returns a simple binary verdict (human text vs. AI content detected)

Pricing: Freemium, with free tools available and paid plans for advanced and enterprise use cases.

Notable for its published accuracy claims (over 99% AI detection accuracy with a 0.2% false-positive rate) and for expanding beyond plagiarism detection (founded in 2015) into broader integrity, governance, and compliance scenarios, including training data verification and unauthorized LLM usage monitoring.