Copyleaks is an AI-powered plagiarism detection and AI content detection platform founded in 2015. The platform uses natural language processing, machine learning, and deep neural networks to detect AI-generated text, plagiarism, and code similarity. Independent tests show Copyleaks achieves approximately 99% AI detection accuracy with a false positive rate of around 0.2%, making it one of the most trusted solutions for academic institutions and enterprises. ¹⁾

Copyleaks launched in 2015 with an initial focus on plagiarism detection to help organizations protect original content. The company has since expanded into AI content detection, compliance tools, and GenAI governance solutions. Copyleaks was named one of the 153 fastest-growing companies in the US. ²⁾

Copyleaks uses a combination of NLP analysis, machine learning, token prediction analysis, linguistic modeling, deep learning, and proprietary AI Logic to distinguish AI-generated text from human writing. ³⁾ The system analyzes:

• Tone and sentence structure patterns
• Perplexity (text unpredictability) - AI text shows smoother, more formulaic patterns
• Burstiness (variation in sentence length and complexity) - human writing exhibits more variation
• Semantic coherence patterns characteristic of LLM outputs

The platform detects content from major AI models including ChatGPT, GPT-4, GPT-5, Gemini, Claude, DeepSeek, and Grok. It can identify fully AI-generated text, hybrid AI-human content, and AI text that has been edited or paraphrased. Detection is available in over 30 languages. ⁴⁾

The plagiarism scanner compares submitted text against web sources, academic databases, internal repositories, and previous submissions in over 100 languages, providing similarity scores and source matches. ⁵⁾

• AI Image Detection - Identifies images generated or altered by AI at the pixel level
• Code Similarity Analysis - Detects plagiarism and unauthorized reuse in source code
• AI Model Training Data Validation - Verifies training data is original and compliant
• Unauthorized LLM Usage Detection - Identifies when LLMs have leveraged protected content

Copyleaks claims over 99% accuracy in detecting AI content, validated by multiple independent third-party studies: ⁶⁾

• A July 2023 study on arXiv by four international researchers declared Copyleaks the most accurate AI detector for LLM-generated text, testing against 124 human submissions and 40 ChatGPT-generated submissions
• Independent benchmarks report a false positive rate of approximately 0.2% ⁷⁾
• The platform continuously updates its models to handle evolving LLMs

Noted limitations include reduced effectiveness on heavily humanized or paraphrased AI content. ⁸⁾

• Sentence-level probability reports with detailed analysis
• Advanced dashboards and analytics
• Adjustable sensitivity levels (conservative for low false positives, sensitive for hybrid detection)
• Multilingual support across 30+ languages
• GDPR and FERPA compliance
• IP and copyright compliance tools
• GenAI governance framework
• AI model training data validation

Copyleaks offers robust API integrations for embedding detection capabilities into existing workflows: ⁹⁾

• Canvas (via SpeedGrader) - Direct LMS integration
• Moodle - Learning management system integration
• Other LMS platforms via API
• Publishing and editorial workflow integrations
• Content management platform integrations

Copyleaks offers a free AI detector tool with limited usage (approximately 10 pages/month). Paid plans range from approximately $13.99 to $99.99 per month depending on usage volume, with custom enterprise pricing available. ¹⁰⁾

Copyleaks is trusted by world-class universities (including Utah State University), Fortune 500 companies, publishers, and editorial organizations for academic integrity and content verification workflows. ¹¹⁾

• GPTZero
• Originality.ai
• Grammarly AI