Unfox AI
Free AI detector for ChatGPT, Claude, Gemini, and multilingual text
Unfox AI offers a rare truly free, high-accuracy AI detector with strong multilingual support and privacy. The sentence-level report and API make it practical for both individual and team use, but it lacks advanced integrations and is best for English and Chinese users.
- Educators reviewing student submissions for AI-generated content
- Content creators ensuring originality before publishing
- SEO teams avoiding penalties for AI-generated text
- Recruiters verifying cover letters and reports
- Users needing offline detection capability
- Teams requiring support for languages other than the 17 supported
- Very high-volume enterprise users needing guaranteed uptime
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In short
Unfox AI — Free AI detector for ChatGPT, Claude, Gemini, and multilingual text. Best for Educators reviewing student submissions for AI-generated content, Content creators ensuring originality before publishing, SEO teams avoiding penalties for AI-generated text. Free to use.
Viability Score
How likely is Unfox AI to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
Last calculated: July 2026
How we score →Key Features
- Deep learning AI detection engine analyzing perplexity and burstiness
- Sentence-level highlighted report showing AI-suspected vs human-written text
- Multilingual support for 17 languages including English and Chinese
- Multi-model coverage: ChatGPT, Claude, Gemini, DeepSeek
- Bulk document upload and detection
- API for workflow integration
- 99.8% accuracy with <0.2% false positive rate
- No content storage — privacy-first design
- Sample text for quick testing
- Completely free to use with no credit card required
- Proprietary large model for detection
- Confidence score per detection
- Real-time automatic language identification
About Unfox AI
Unfox AI is a free, high-accuracy AI content detector designed to identify AI-generated text from models like ChatGPT, Claude, Gemini, and DeepSeek. It uses a proprietary deep learning model that analyzes perplexity, burstiness, and other linguistic features to catch even rewritten or polished AI content. The tool supports 17 languages, including English, Chinese, Japanese, German, and French, making it suitable for global users. Unfox provides sentence-level highlighted reports showing which sections are AI-suspected versus human-written, along with a confidence score. Its bulk detection and API enable scalable workflow integration. Key differentiators include a 99.8% true positive rate with less than 0.2% false positive rate in internal tests, strong data privacy (content never stored), and a completely free tier with no credit card required. This positions Unfox as a practical alternative to paid services like Originality.ai or GPTZero for users who need accurate detection without cost.
Behind the Verdict
Unfox AI is a solid choice for anyone who needs frequent AI detection without a subscription. The free tier is genuinely unlimited, and the accuracy is competitive with paid tools. The sentence-level highlighting is a standout feature—it shows exactly which parts of a text are flagged, saving time during review. For educators and content creators working in English or Chinese, this tool is hard to beat. The API and bulk detection are welcome additions for teams with larger volumes. However, Unfox has limitations. It does not offer integrations with LMS, CMS, or plagiarism checkers, which may be a dealbreaker for schools or agencies with established workflows. The false positive rate, while low, can still flag human-written creative text, especially in non-native languages. Compared to GPTZero, which has more integrations and broader language support, Unfox is simpler but less versatile. Originality.ai offers more nuanced detection and premium support, but at a cost. In practice, Unfox is best as a first-pass detector—use it to triage content, then manually review flagged sections. If you need offline capability or support for languages beyond the 17 offered, look elsewhere. Unfox's privacy-first approach is a genuine plus, especially for sensitive documents. Overall, it's a strong free tool for its niche, but not a full enterprise solution.
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Use Cases
- Upload a student essay to check for AI-generated sections before grading.
- Paste a blog draft to verify it reads as human-written before publishing.
- Run a candidate's cover letter through Unfox to detect AI ghostwriting.
- Scan a batch of SEO articles via API to filter out AI-heavy content.
- Check a Chinese translation for AI traces using the multilingual detection.
Models Under the Hood
as of 2026-07-17
Limitations
- Unfox AI is currently free with no paid plans, so heavy or continuous use may face throttling.
- It only reliably detects content from major AI models (ChatGPT, Claude, Gemini) and works best in English and Chinese.
- No desktop or mobile app is available, and the blog has no articles yet.
12-month cost
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