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ContentDetector.org gives publishers, agencies, educators, and learning teams a free way to estimate whether text was AI-written. Users can paste text, upload files, or submit URLs, then review an overall percentage, section highlights, and guidance. It also includes a 1,000-character AI-to-human converter, API access, a browser extension, document uploads, and batch checks. Its stated detection patterns cover GPT-5, Gemini, Claude, and other large models, while privacy controls address retention and model training. Results can be wrong on short or heavily edited writing, so human review remains important.
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TrustOriginality.ai
Free plan AndroidAPIExtension+3Multimedia authenticity checks and signed evidence reports — TrustOriginality.ai analyzes text, images, audio, and video and creates signed PDF reports with QR verification and public links.
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AI Detectors.io
Free plan APIExtensionMac+2Sentence-level detection with Word and Chrome workflows — AI Detectors.io adds plagiarism, citation, grammar, watermark-removal tools, sentence scores, and Word reports alongside AI detection.
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GPTZero
Free plan APIExtensionWebLarge free scans and detailed writing feedback — GPTZero supports free texts up to 150,000 characters or 250-file batches and adds word-level explanations, writing replay, and feedback.
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It's AI
Free plan APIExtensionWebEducation teams needing Canvas and broad workflow integrations — It's AI adds Deep Scan heatmaps, plagiarism and grammar checks, large PDF/DOCX/TXT uploads, and Canvas, Zapier, and ChatGPT integrations.
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Originality.ai
Free plan APIExtensionWebWebsite-wide monitoring and multilingual API checks — Originality.ai combines AI, plagiarism, fact, readability, and quality checks with scheduled website crawling and AI detection in 30 languages.
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Winston AI
Free plan APIExtensionSelf-hosted+1Multilingual text and image scanning with OCR — Winston AI detects text and images, extracts writing from scans and handwriting, and offers prediction maps plus downloadable reports.
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AI Detector Pro
Free plan AndroidAPIMac+2Revising English text flagged by AI detectors — AI Detector Pro focuses on predicted AI-triggering passages, overused phrases, tone analysis, and adjustable English humanization.
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Copyleaks AI Detector
Free plan APIExtensionSelf-hosted+17.5 Visit site - 9
AI-Content Detector ML
Free plan ExtensionWeb - 10
Airno
Free plan APIWeb - 11
Detecting-AI.com
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Detecto
Free plan Web - 13
GPTKit
Free plan APIWeb - 14
EyeSift
Free plan Web - 15
Isgen AI Detector
Free plan APIWeb - 16
Pangram
Free plan APIExtensionWeb - 17
Learnaway
Free plan Web - 18
Mask AI Detector
Free plan Web - 19
Proofademic
Free plan APIWeb - 20
Smodin AI Detector
Free plan ExtensionWeb - 21
ClassGuard
Free trial Web - 22
Content Checker by AI Aware
Free trial Web - 23
Elucida
Paid Web - 24
TheChecker.AI
Paid APIExtensionWeb
Alternatives may be preferable when you need analysis of images, audio, or video; Android access; broader language support; or a different reporting format. Some add plagiarism, grammar, citation, or readability tools, while others connect directly with classrooms, publishing systems, or office software. Compare each service's free access, paid terms, file and character limits, integrations, report options, and review controls. Consider whether you need a writing workflow, website scanning, document evidence, or multilingual analysis rather than text detection alone.
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