AIGPTZero

AIGPTZero is a GPT and LLM output detector that estimates whether essays, reports, articles and resumes were written by people or by AI.

Results come as probability bands (human, AI-generated, mixed) with sentence highlights and extra plagiarism, paraphrase, readability and grammar checks. Supported sources include ChatGPT, GPT-5, GPT-4o, Gemini 2.5, Claude, DeepSeek, Qwen, Llama, Grok and Copilot. PDF/DOCX upload, API and LMS workflows. Freemium.