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Copyleaks

AI content detector and plagiarism checker for text, code, images and video, with a developer API.

Free plan + paidAI content detectors

Updated · AppBreakup editorial · Web, Browser extension

Visit CopyleaksSee 5 alternatives

Is Copyleaks free?

Free plan, plus paid plans

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  • GPTZero logo
    GPTZero

    Free plan + paid

    Compare
  • Grammarly logo
    Grammarly

    Starting price: $12 per member/month billed annually ($30 monthly), Pro

  • Originality.ai logo
    Originality.ai

    Starting price: $12.95/month billed annually (Pro); $14.95 monthly

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About Copyleaks

Copyleaks checks whether content is original and whether it was written or generated by AI. Its core products are a plagiarism checker that compares text against the web and private repositories, and an AI text detector that highlights the phrases that look machine-written. It has since added detection of AI-generated images and video, plagiarism checks for source code, a grammar checker, a citation checker that flags fabricated references, and text moderation. Schools and universities use it for academic integrity, often through integrations with learning platforms, while publishers and companies use it before publishing or to govern AI use. Individuals can work in the web app or browser extension, and developers get a REST API with official SDKs for six languages. Pricing is credit-based by pages scanned, with a small free allowance for trying the detector and paid plans for individuals and organisations.

Best for: Schools, publishers and developers who need AI detection and plagiarism checks in one service or API.

Pros and cons

What works

  • Combines plagiarism and AI detection in a single scan
  • Covers source code, images and video, not just prose
  • Well-documented API with SDKs for six languages
  • Can compare against private document databases

Why people leave

  • Credit-based pricing can add up for long documents
  • Like all AI detectors, results are probabilistic and can misfire
  • Main website blocks automated access, so checks happen through the app or API

Copyleaks vs GPTZero, Grammarly and Originality.ai

From each app's listing and the prices verified on its own site. A dash means we haven't verified it yet.

AttributeCopyleaksGPTZeroGrammarlyOriginality.ai
PricingFree plan + paidFree plan + paidFree plan + paidFree plan + paid
Verified price——$12 per member/month billed annually ($30 monthly), Pro$12.95/month billed annually (Pro); $14.95 monthly
Free planYesYesYes, $0 a month with 100 AI promptsYes, 10K words one time
Open sourceNoNoNoNo
Self-hostableNoNoNoNo
PlatformsWeb, Browser extensionWeb, Browser extensionWeb, Windows, macOS, iOS, Android, Browser extensionWeb, Browser extension

Full Copyleaks vs GPTZero comparison

Top Copyleaks alternatives

See all 5
  1. 1GPTZero logo
    GPTZero

    A detector built for teachers, with sentence-level highlighting and a generous free tier.

    68.8
  2. 2Grammarly logo
    Grammarly

    Bundles a plagiarism and AI detector with writing help, useful if you already pay for Grammarly.

    66.2
  3. 3Originality.ai logo
    Originality.ai

    Aimed at publishers and SEO teams, with AI, plagiarism and fact checks in a pay-as-you-go model.

    64.8
  4. 4QuillBot logo
    QuillBot

    Offers a free AI detector alongside paraphrasing and grammar tools for students.

    52.3
  5. 5Scribbr logo
    Scribbr

    Pay per document instead of subscribing, with a student-focused plagiarism report and free AI check.

    50.3

Why people left Copyleaks

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Copyleaks: common questions

What is Copyleaks?

Copyleaks: AI content detector and plagiarism checker for text, code, images and video, with a developer API. Best for schools, publishers and developers who need AI detection and plagiarism checks in one service or API. Available for Web and Browser extension.

Is Copyleaks free?

Copyleaks has a free plan and paid plans.

Is Copyleaks open source?

No, Copyleaks is not open source.

What platforms does Copyleaks run on?

Copyleaks is available for Web and Browser extension.

What are the best alternatives to Copyleaks?

The highest-ranked Copyleaks alternatives right now are GPTZero, Grammarly and Originality.ai. See the full ranked list for pricing, platforms and verified facts.

Copyleaks vs GPTZero: what's the difference?

Both Copyleaks and GPTZero are free with paid plans. Both run on Web and Browser extension.

See all 5 Copyleaks alternatives