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GPTRadar
Detect AI-generated text in a click. Built on OpenAI's GPT-3 analysis engine; requires a minimum of 400 words for reliable results. Created by the team at Neuraltext.
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Originality.ai
The most accurate AI and plagiarism detector for serious content publishers. Combines traditional plagiarism checking with state-of-the-art AI content detection for GPT-4, Claude, and Gemini.
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GPTZero
The global standard for AI detection — Humans deserve the truth. Uses perplexity and burstiness scoring to identify AI-written passages with sentence-level attribution. Supports bulk document uploads.
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AI Detector Pro
An accurate AI detector with a built-in AI Eraser tool for content humanization. Supports detection across English, Spanish, French, German, Arabic, Korean, and Portuguese. Achieved $330K revenue in 2025.
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GPTKit
A free AI text generation detection tool using 6 different AI-based detection techniques for higher accuracy (~93%). Provides detailed authenticity and reality reports. First 2,048 characters free for guest users.
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Turnitin
The industry standard for academic integrity — now with AI writing detection to identify content generated by ChatGPT, GPT-4, and other large language models. Trusted by thousands of institutions worldwide.
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Copyleaks – AI Content Detector
Enterprise-grade AI content and plagiarism detector that identifies AI-generated text at the sentence level across 30+ languages. Supports API integration for LMS and content management workflows.
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ZeroGPT
GPT-4, ChatGPT and AI detector to identify OpenAI text. Free to use with per-sentence AI attribution, batch file checking, and support for multiple AI models including Gemini and DeepSeek.
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Winston AI
AI content detection solution designed for educators and publishers. Offers a Readability Score alongside AI detection, OCR for scanned documents, and team collaboration features for schools and newsrooms.
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SciSpace – Academic AI Detector
Purpose-built for academic writing — scans both plain text and PDF documents for AI-generated content. Achieves 96.2% F1 score. Identifies GPT-3, ChatGPT, GPT-4, and Jasper-generated content in research papers and theses.
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