What does an AI detector actually measure?

It estimates the probability that a piece of text — and sometimes an image — was generated by AI rather than a human, by analyzing patterns like word predictability and sentence variety. It returns a score, not a definite yes or no.

How accurate are AI detectors?

They're a useful signal but far from perfect: genuine human writing can be flagged as AI, and edited AI text can slip through. Accuracy also drops as new models improve, so treat the result as an estimate, not proof.

Should an AI detector score be used to accuse someone?

No, not on its own. Because scores are probabilities and false positives are common, use detection as one input alongside drafts, version history, and a conversation before making any high-stakes judgment.

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AI Detector · 13 tools

Best AI Detector Tools (2026)

Compare AI detectors for text and content, including accuracy, free scans, plagiarism checks, and API access.

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AI Tools List

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Explore a curated directory of the best AI tools and SaaS solutions, including AI image generators, chatbots, and writin

What is an AI detector?

An AI detector estimates whether text — and sometimes images — was generated by AI rather than a human. It analyzes patterns like word predictability and phrasing and returns a probability score. Detectors are used to screen essays, articles, and submissions, though none is perfectly accurate.

Core features to look for

AI-vs-human probability score for text
Sentence-level highlighting of flagged passages
Support for common models (GPT, Claude, Gemini)
Bulk or document upload checks
Plagiarism checks in some tools
Free tier and API access

Who uses AI detectors, and how

Check text for AI

Teachers, editors, and hiring teams screen essays, articles, and submissions.

Image & content detection

Some tools flag AI-generated images or mixed human-AI content.

Free scans

Compare free detectors by word limits, accuracy claims, and daily quota.

API & bulk

Integrate detection into an LMS, CMS, or moderation pipeline.

How does an AI detector work?

AI detectors run classifier models trained on human and AI text. They measure signals like how predictable each word is (perplexity) and how uniform the phrasing is (burstiness), then output a probability. Because AI writing keeps improving, scores are estimates, not proof.