Last updated 07-15-2026
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Unfox AI
Unfox AI is a free online tool that detects AI-generated text with high accuracy. It analyzes text using a proprietary model that examines perplexity, burstiness, and other subtle signals to distinguish human writing from AI output. The tool highlights each sentence as AI-suspected or human-written, making it easy to identify specific areas of concern within long documents.
It supports detection across major AI writing models including ChatGPT, Claude, Gemini, and more, with strong multilingual capabilities covering 17 mainstream languages such as English and Chinese. This makes it valuable for global teams working in diverse languages.
Unfox AI serves a wide range of users including educators verifying academic integrity, editors ensuring content originality, recruiters assessing genuine applications, and website operators avoiding search engine penalties. It also offers bulk document uploads and API integration, enabling seamless embedding into editorial workflows and content audits.
The platform emphasizes privacy by not storing any submitted content after detection. Its false positive rate is impressively low, below 0.2%, providing reliable results without overflagging. Additionally, Unfox AI offers advanced features like AI humanization services and supports large batch processing.
Overall, Unfox AI is a practical and trustworthy solution for anyone needing to verify the authenticity of written content and maintain originality in an era of widespread AI assistance.
🔍 Sentence-Level Highlighting: See exactly which sentences are AI-generated for precise review.
🌐 Multilingual Support: Detect AI content in 17 languages including English and Chinese.
⚙️ Bulk Upload & API: Process large volumes and integrate detection into workflows easily.
🛡️ Privacy-Focused: No content is stored after checking, ensuring user data safety.
📊 Low False Positives: Reliable detection with less than 0.2% false positive rate for trustable results.
Supports detection across 17 languages including English and Chinese
Highlights AI-suspected sentences for easy review
Offers bulk upload and API for large-scale use
Maintains user privacy by not storing submitted content
Low false positive rate under 0.2% ensures reliable results
Pricing plans require annual commitment for best rates
No free plan available, only paid subscriptions
Limited information on offline or desktop usage
Can Unfox AI detect AI-generated text in languages other than English?
Yes, Unfox AI supports detection in 17 mainstream languages including Chinese, providing accurate results across multiple languages.
Does Unfox AI store the text I submit for detection?
No, Unfox AI does not store any content after detection. All submitted text is discarded immediately to protect your privacy.
Can I check large volumes of content at once?
Yes, Unfox AI supports bulk document uploads and offers an API for integrating detection into large-scale workflows.
How accurate is Unfox AI in detecting AI-generated content?
Unfox AI has a false positive rate below 0.2%, making it highly reliable in distinguishing AI-generated text from human writing.
Is there an API available for developers?
Yes, Unfox AI provides an API that allows developers to integrate AI detection and humanization features into their applications.
Can Unfox AI detect content rewritten or polished by AI?
Yes, the detector can identify subtle AI traces even in lightly rewritten or polished AI-generated content.
What types of users benefit most from Unfox AI?
Educators, editors, recruiters, content creators, and website operators use Unfox AI to ensure originality and avoid AI-related penalties.