Originality.ai

Originality.ai is an AI content detection platform that identifies text generated by large language models, including GPT-5, ChatGPT, Claude 4, Gemini 2.5, and Grok 3. It offers a free AI detector tool on the website, along with a Chrome extension that records document creation replays to help users prove their writing is original. The detector is trained on millions of human and AI-written texts and achieves high accuracy, as validated in multiple studies. It supports 30 languages and provides an API for scalable integration. The platform is designed for content publishers, educators, and enterprises that need to verify content authenticity at scale.

Key Features

• Free AI detection for texts up to 12,000 characters
• Supports detection across major AI models
• Chrome extension with document replay
• Multilingual detection (30 languages)
• API for integration into content workflows
• Scan history storage and sharing

Use Cases

• Verifying student assignments
• Auditing freelance or agency content
• Ensuring compliance with Google's AI content guidelines
• Scaling content quality checks via API