Last updated 07-30-2026
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AI Detector
AI Detector scans text, documents, and URLs to flag writing from ChatGPT, GPT-5.4, Claude, Gemini, and other models. Paste up to 5,000 words, upload a file, or drop a link, and get sentence-level scores with a color-coded heatmap in about 3 seconds on average.
Single-model detectors carry a 1.3% to 5.0% false positive rate, meaning real human prose gets flagged. AI Detector runs four independent engines and only treats text as AI when they agree, citing Arizona State University research that multi-detector consensus drives false positives toward zero. You also see per-detector splits when they disagree.
Teachers, students, writers, and compliance teams use it for academic integrity, pre-submission self-checks, and content verification. The built-in detector is unlimited on paid plans, while third-party engines like Originality.ai, Winston AI, and GPTZero bill at 2 credits per 100 words.
Four-detector consensus flags AI only when multiple engines agree, cutting false positives toward zero
Sentence-level heatmap with color-coded scores and exportable PDF reports
Paste text, upload documents, or analyze URLs with a 5,000-word input limit
Built-in AI detector is unlimited on paid plans; third-party engines cost 2 credits per 100 words
Claims 99.1% accuracy across 5M+ analyzed texts with 500K+ active users
Optional plagiarism, spell check, and fact check modules from 1 credit per 100 words
Four-detector consensus reduces false positives compared with any single engine alone.
Sentence-level heatmaps and exportable PDF reports support academic and compliance workflows.
Free scans require no credit card, with paid tiers scaling to 7,500 monthly credits.
Accepts pasted text, document uploads, and URL analysis in one interface.
Built-in detector is unlimited on all paid plans.
Third-party engines like Originality.ai and GPTZero consume 2 credits per 100 words.
Free input is capped at 5,000 words per scan.
Organization tier at $99 per month is required for API access.
Is AI Detector free to use?
AI Detector offers free scans with no credit card required. Paid plans start at $9 per month for 500 credits, $29 per month for 2,000 credits, and $99 per month for 7,500 credits with API access on the Organization tier.
How does AI Detector reduce false positives?
AI Detector aggregates four independent detection engines and only flags text when multiple detectors agree. The site cites Arizona State University research showing multi-detector consensus drives false positive rates toward zero compared with any single detector alone.
Which AI models can AI Detector identify?
AI Detector detects text from ChatGPT, GPT-5.4, Claude, Gemini, and other popular models. Third-party engines include Originality.ai, Winston AI, and GPTZero, each billed at 2 credits per 100 words on top of the free built-in detector.
What input formats does AI Detector accept?
AI Detector accepts pasted text up to 5,000 words, uploaded documents, and URLs for analysis. Results include an overall AI score, per-sentence breakdowns, and downloadable PDF reports.
How do AI Detector credits work?
The built-in AI Detector costs no credits on paid plans. Originality.ai, Winston AI, and GPTZero each cost 2 credits per 100 words. Plagiarism, spell check, and fact check modules each cost 1 credit per 100 words.
Can teachers use AI Detector for academic integrity?
AI Detector targets educators with bulk document scanning, class management tools, and student history tracking. The site reports 50,000+ educators among its 500,000+ users checking assignment authenticity.