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AI Detector

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Check text for AI-generated writing with sentence-level scores and multiple detectors.

FreemiumAI Content DetectorsAI Plagiarism Checkers

Verified Nov 2, 2026

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AI Detector website screenshot

What is AI Detector?

AI Detector checks writing for signs of AI-generated content and presents an overall score alongside sentence-level results. Users can paste text, analyze documents, or submit a URL. Color-coded highlighting distinguishes passages assessed as likely AI-generated, mixed, or likely human-written, helping users inspect individual sections rather than rely only on a single score.

The service combines its built-in detection model with external detectors and displays their separate results. This lets educators, writers, and businesses compare assessments and see where detectors disagree. Detection results are probabilistic, and individual detectors can falsely flag human writing, so the scores are best treated as signals for review rather than proof of authorship.

Additional capabilities include plagiarism checking, bulk scanning, and downloadable PDF reports. The built-in detector is free, while external detector scans and other checks consume credits according to word count and the tools selected. Paid subscriptions provide monthly credit allowances, with API access and dedicated support included in the Organization plan.

What can AI Detector do?

  • Multiple-detector comparison

    Compare the built-in model with external detectors and inspect where their assessments agree or differ.

  • Sentence-level analysis

    Review color-coded sentences with individual probability scores alongside an overall assessment.

  • Text, document, and URL scanning

    Submit pasted writing, documents, or a URL for analysis.

  • Plagiarism checking

    Check content against web sources for potentially copied text using credits.

  • Bulk scanning and PDF reports

    Analyze documents in batches and download detailed PDF reports for recordkeeping.

Who is AI Detector for?

Educators
Review assignments for possible AI-generated content and investigate sentence-level results.
Students
Check their own writing before submitting assignments.
Content writers
Assess writing for AI-generated passages and potential plagiarism.
Businesses
Review marketing material and business communications, with bulk scanning and reporting.

How much is AI Detector?

Official pricing

  • Starter

    $9/mo

  • Pro

    $29/mo

  • Organization

    $99/mo

Free plan: Unlimited use of the built-in AI detector, with no credit card required for free scans.

Frequently asked questions

Can I use AI Detector for free?

The built-in AI detector is free and unlimited. Free scans do not require a credit card.

How do credits work?

Credit usage depends on the tools selected and the number of words scanned. Listed external detectors cost 2 credits per 100 words, while plagiarism, spelling, and fact checks each cost 1 credit per 100 words.

What do the paid plans include?

Starter costs $9 per month for 500 credits, Pro costs $29 per month for 2,000 credits, and Organization costs $99 per month for 7,500 credits. These prices are billed monthly.

Does AI Detector offer API access?

API access is included in the Organization plan, along with dedicated support.

Can AI detection incorrectly flag human writing?

Yes. Individual detectors can produce false positives; AI Detector displays multiple detector results so users can compare their assessments.

AI Detector alternatives

Compare alternatives
  1. 1GPTZeroCheck text for AI-generated content and review the writing process.
  2. 2ZeroGPTCheck text for AI-generated content and plagiarism, with tools for editing and rewriting.
  3. 3TurnitinCheck writing for AI use and text similarity, and support secure academic assessment.
  4. 4GPTinfWriting toolkit that humanizes AI text and checks drafts for AI signals and plagiarism.
  5. 5JustDoneAI tools for drafting, rewriting, checking originality, and studying.

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