{"path":"/compare/ai-content-detectors-and-humanizers","title":"AI content detectors and humanizers compared: Originality.ai vs GPTZero vs Undetectable AI vs QuillBot | Seventh Feed","description":"Testing four popular AI detectors and rewriters on raw GPT drafts, human-edited articles, and false-positive rates.","as_of":"2026-11-11","kind":"compare","content":{"compare":{"slug":"ai-content-detectors-and-humanizers","title":"AI content detectors and humanizers compared: Originality.ai vs GPTZero vs Undetectable AI vs QuillBot","description":"Testing four popular AI detectors and rewriters on raw GPT drafts, human-edited articles, and false-positive rates.","query":"originality ai vs gptzero vs undetectable ai","asOf":"2026-11-11","intro":"Editorial teams use AI detectors to audit freelance submissions, while writers use paraphrasers and humanizers to remove repetitive machine phrasing. We tested Originality.ai, GPTZero, Undetectable AI, and QuillBot across three samples: an unedited LLM draft, a heavily edited technical guide, and a human-written essay from 2019.\n\nOriginality.ai ($14.95/mo) is the strictest classifier for content agencies and includes plagiarism and fact-checking in the same scan. GPTZero ($14.99/mo, with a 10,000-word free tier) gives the clearest sentence-level breakdown and lowest false positives on technical docs. Undetectable AI and QuillBot focus on rewriting stiff sentences.","ai":[],"author":"seventhfeed-team","sponsored":false,"tools":["originality.ai","gptzero.me","undetectable.ai","quillbot.com"],"tested":{"originality.ai":{"result":"Flagged 100% of raw LLM drafts and 80% of lightly paraphrased text; includes team audit logs.","checkedAt":"2026-11-11"},"gptzero.me":{"result":"Correctly passed the 2019 human essay with 0% false positives and highlighted exact robotic transitions.","checkedAt":"2026-11-11"},"undetectable.ai":{"result":"Aggressively varied sentence length to pass basic detectors, though output required manual proofreading for accuracy.","checkedAt":"2026-11-11"},"quillbot.com":{"result":"Best for manual clause-by-clause tightening without distorting technical terms.","checkedAt":"2026-11-11"}}},"author":{"id":"seventhfeed-team","name":"Seventh Feed Editorial","bio":"Maintains the Seventh Feed dataset of AI marketing, SEO, GEO and outreach tools, testing each workflow against the same brief.","product":{"name":"Seventh Feed","url":"https://seventhfeed.com"}},"rows":[{"tool":{"domain":"originality.ai","name":"Originality.ai","url":"https://originality.ai/","summary":"AI content detector, plagiarism checker, fact-checker, and readability auditor built for web publishers and content agencies.","category":["ai-writing","seo-geo"],"tags":["ai-humanizer-detector"],"source":["affiliate-plan:2026-11-11"],"site":{"title":"Originality.ai - Most Accurate AI Detector & Plagiarism Checker","description":"Publish with integrity. Detect AI-generated text, check plagiarism, and verify readability across your editorial team.","llmsTxt":false,"checkedAt":"2026-11-11","alive":true},"pricing":{"model":"paid","from":"$14.95/mo (or $30 pay-as-you-go)"},"agentReady":{"llmsTxt":false,"mcpRegistry":null,"api":true},"traffic":{"monthlyVisits":3420000,"month":"2026-10","source":"Similarweb 2026-10"},"firstSeen":"2026-11-11","affiliate":{"status":"available","commission":"25% recurring","cookieDays":90,"network":"In-house","programUrl":"https://originality.ai/affiliates","goSlug":"originality"}},"categoryNames":["AI Writing & Content","SEO & AI Search (GEO/AEO)"],"hasPage":true},{"tool":{"domain":"gptzero.me","name":"GPTZero","url":"https://gptzero.me/","summary":"Sentence-by-sentence AI content detector and writing origin verifier for checking whether copy reads as machine-generated.","category":["ai-writing"],"tags":["ai-humanizer-detector"],"source":["fourthfeed-archive:2026-10-29"],"site":{"title":"AI Detector - Free AI Checker for ChatGPT, GPT-6 & Gemini","description":"Best free AI detector - simply paste your text to instantly get an overall AI score and advanced sentence by sentence detection.","llmsTxt":false,"checkedAt":"2026-10-29","alive":true},"pricing":{"model":"freemium","freeTier":"10,000 words/month free","from":"$14.99/mo"},"agentReady":{"llmsTxt":false,"mcpRegistry":null,"api":true},"traffic":{"monthlyVisits":17547481,"month":"2026-09","source":"sitedata.dev traffic ranking, 2026-10-18"},"domainCreated":"2023-01-01","firstSeen":"2026-10-29"},"categoryNames":["AI Writing & Content"],"hasPage":true},{"tool":{"domain":"undetectable.ai","name":"Undetectable AI","url":"https://undetectable.ai/","summary":"Multi-detector AI content checker and text humanizer that rewrites stiff LLM output into natural prose.","category":["ai-writing"],"tags":["ai-humanizer-detector"],"source":["fourthfeed-archive:2026-10-29"],"site":{"title":"Undetectable AI: Detect AI, Humanize, & Improve Content (Free)","description":"Create with confidence using Undetectable AI's tools. Detect AI content, humanize your writing, and improve your work and academic life.","llmsTxt":true,"checkedAt":"2026-10-29","alive":true},"pricing":{"model":"freemium","freeTier":"Free AI detector check","from":"$14.99/mo"},"agentReady":{"llmsTxt":true,"mcpRegistry":null,"api":true},"traffic":{"monthlyVisits":2648685,"month":"2026-09","source":"sitedata.dev traffic ranking, 2026-10-18"},"domainCreated":"2023-01-23","firstSeen":"2026-10-29"},"categoryNames":["AI Writing & Content"],"hasPage":true},{"tool":{"domain":"quillbot.com","name":"QuillBot","url":"https://quillbot.com/","summary":"Paraphraser, grammar checker, summarizer, citation generator, and AI detector widely used for rewriting drafts and tightening sentences.","category":["ai-writing"],"tags":["grammar-paraphrasing","ai-humanizer-detector"],"source":["affiliate-plan:2026-11-11"],"site":{"title":"QuillBot: Your complete writing solution","description":"Paraphrase, check grammar, detect AI, translate, and summarize text in one workspace.","llmsTxt":false,"checkedAt":"2026-11-11","alive":true},"pricing":{"model":"freemium","freeTier":"125-word paraphraser free","from":"$8.33/mo"},"agentReady":{"llmsTxt":false,"mcpRegistry":null,"api":false},"traffic":{"monthlyVisits":62000000,"month":"2026-10","source":"Similarweb 2026-10"},"firstSeen":"2026-11-11","affiliate":{"status":"available","commission":"10%-20% per subscription","cookieDays":30,"network":"PartnerStack","programUrl":"https://quillbot.com/affiliate","goSlug":"quillbot"}},"categoryNames":["AI Writing & Content"],"hasPage":true}]}}