Last updated 06-25-2026
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Unfox AI
Unfox AI is a free online detector that scores pasted or uploaded text as human-written or machine-generated. Teachers, editors, recruiters, and site owners use it to flag AI-assisted drafts, lightly rewritten ChatGPT output, and mixed human-AI copy before grading, publishing, or hiring decisions.
The checker runs on a proprietary large model that reads perplexity, burstiness, and related text signals. Results include an overall confidence split plus sentence-level highlights that mark each line as AI-suspected or human-written, so reviewers can see exactly where risk sits in a long document.
Coverage spans major writing models such as ChatGPT, Claude, Gemini, DeepSeek, Grok, Qwen, Kimi, and Doubao, with strong support for both English and Chinese workflows. Bulk document uploads and an API let teams wire the same checks into editorial pipelines, localization review, or site-wide content audits.
Paste or upload text for instant AI vs human scoring
Sentence-level highlights for AI-suspected and human lines
Detects ChatGPT, Claude, Gemini, DeepSeek, and more
English and Chinese multilingual detection support
Bulk document uploads for high-volume review
API access for workflow and system integration
Submitted content discarded immediately after checks
Free detector on the homepage with no credit card required to start.
Sentence-level report makes it easier to triage long mixed drafts.
Explicit privacy stance: submitted text is discarded after each check.
Covers English and Chinese plus several major model families in one tool.
Public pages do not spell out paid detector limits or pricing tiers.
Accuracy and volume claims on the site are self-reported, not independently verified.
No mobile app; the detector runs in the browser.
Does Unfox AI store the text I submit for detection?
No. Unfox AI states that it never stores submitted content and discards it immediately after detection. The homepage lists 100% data security as a core commitment for its AI content checker.
Is Unfox AI free to use?
Yes. Unfox AI offers a free AI/Human detector on its homepage with no credit card required to start. The site also references a paid version, but public detector pricing details were not listed on the pages reviewed.
Which AI writing tools can Unfox AI detect?
Unfox AI is built to catch traces from major models including ChatGPT, Claude, Gemini, DeepSeek, Grok, Qwen, Kimi, and Doubao. The homepage positions it for multilingual writing workflows, not just a single model family.
Does Unfox AI work for Chinese text?
Yes. Unfox AI explicitly supports Chinese content alongside English. Its marketing copy and user testimonials both call out consistent results across English and Chinese drafts.
Does Unfox AI offer an API?
Yes. Unfox AI lists bulk detection and API integration among its core features, aimed at teams that need to embed AI identification into editorial, QA, or publishing workflows.
Who operates Unfox AI?
Unfox AI is operated by DeepNail Limited, which does business as Unfox. The company's privacy policy is published at unfox.ai/terms/privacy and lists support contact at [email protected].