This free Turnitin AI Detector preview analyzes pasted text to highlight AI-generated passages. Unlimited words with no signup required for quick checks.
Best AI Content Detector Tools (2026)
Compare AI content detectors that flag AI-written text, spot ChatGPT and GPT-4 output, check for plagiarism, and humanize drafts — from quick free scans to bulk API tools.
MyDetector is a free AI content detector and humanizer. It identifies text generated by ChatGPT, Claude, Gemini, and other AI writers and offers a companion humanizer to rewrite detected content.
TextSight is a free AI detector and AI humanizer that shows which sentences in your text read as AI-written, then helps you rewrite them so they sound more natural. It checks text from ChatGPT, Claude, Gemini and Llama. Every scan gives you an AI probability, a 0-100 Humanization Score and a flag on each sentence. What does TextSight do? Paste your text or upload a Word, PDF, .txt or .md file. TextSight marks the sentences that sound AI-written, you humanize only those lines, then you recheck the result in the same place. No copying text between an AI checker and a separate humanizer. Is TextSight free? Yes. You get 3 free checks a day with no signup and no card. Paid plans start at $7.49 a month billed yearly, or $9.99 month to month. How accurate is the TextSight AI detector? In our own benchmark of 1,180 human-written papers from 2018, TextSight wrongly flagged 5.85% of them. The data and method are public. Like every AI detector, it gives a probability, not proof. How is TextSight different from GPTZero, ZeroGPT and Originality.ai? Most AI detectors stop at the score. TextSight carries on into the rewrite and the recheck, so it works as an alternative to GPTZero, ZeroGPT, Copyleaks or Originality.ai if you also want help with the flagged lines. It also works as an alternative to QuillBot or WriteHuman if you want to see your score before and after you rewrite. Who is TextSight for? Students checking essays before they submit, writers and bloggers, SEO and marketing teams, and educators who want sentence-level evidence as one signal rather than a verdict. Where can I use TextSight? On the web, in the free Chrome extension, and on iOS and Android. The AI Humanizer works in 50+ languages and the AI detector is optimized for English. Pro plans also include API access.
GradPilot is an AI-powered essay grading platform for college and graduate admissions. It provides AI detection, foundational scoring, and prompt-specific evaluation against 111 published rubrics for programs like Common App, MBA, PhD, medical school, scholarships, and more. Users can share reviews with mentors for feedback.
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What is an AI content detector?
An AI content detector is a tool that estimates how likely a piece of text was written by an AI model such as ChatGPT, GPT-4, or Gemini rather than a person. It scans the writing for statistical patterns — predictable word choices and even sentence rhythm — and returns a probability score or a highlighted breakdown. Many also bundle plagiarism checks and humanizers that rewrite flagged passages.
What AI content detectors do
- Probability score for AI-generated versus human text
- Sentence-level highlighting of suspected AI passages
- Detects ChatGPT, GPT-4, Gemini, Claude, and Llama output
- Built-in plagiarism and paraphrase checking
- Humanizer that rewrites flagged text to sound natural
- Bulk scanning, API access, and shareable reports
Who uses AI content detectors
01
Educators and academic integrity
Teachers and universities screen essays and submissions for undisclosed AI writing.
02
Editors and publishers
Content teams verify that freelance or outsourced articles are genuinely human-written.
03
SEO and marketing teams
Marketers check drafts before publishing to reduce AI-detection and ranking risk.
04
Writers checking their own work
Authors scan and humanize drafts to pass detectors used by clients or schools.
How AI content detectors work
Detectors run text through a classifier trained on large samples of human and AI writing. They measure signals like perplexity (how predictable each word is) and burstiness (how much sentence length varies), since AI tends to write more smoothly and uniformly. The model weighs these signals into a single likelihood score, which is an estimate — not proof — of who wrote the text.