Alternatives to Copyleaks

A plagiarism checker and AI content detector for text, code and other media. The listings below can replace it for an important use case. Each note says what changes if you switch.

  • Copyleaks

    A plagiarism checker and AI content detector for text, code and other media.

    PaidProprietaryWeb

Replacements

Listings that take over the same core job as Copyleaks.

  • Originality.ai

    An AI text detector and plagiarism checker for publishers and content teams, with browser extensions.

    FreemiumProprietaryWebBrowser extension

    Originality.ai adds readability and fact checks, writing replay and Chrome and Firefox extensions, and it has a limited free tier, but it does not check source code or media.

  • GPTZero

    An AI content detector that estimates whether text was written by ChatGPT, Claude, Gemini or other models.

    FreemiumProprietaryWebBrowser extension

    GPTZero offers sentence-level AI highlighting, Google Docs writing replay and a Chrome extension with a freemium plan, though it does not cover code, video or audio.

  • Winston AI

    An online AI content detector and plagiarism checker for text from ChatGPT, Claude, Gemini and other models.

    FreemiumProprietaryWeb

    Winston AI combines AI detection and plagiarism checking with a free start without a credit card, and it has separate workflows for education, SEO and writers.

  • Quetext

    A web plagiarism checker and AI detector with grammar, summarizing and citation tools.

    FreemiumProprietaryWebBrowser extension

    Quetext pairs plagiarism and AI detection with a citation generator, grammar checker, Chrome extension and REST API, on a freemium plan aimed at students and teachers.

  • ZeroGPT

    A web tool that estimates whether text was written by AI, with extra writing utilities.

    FreeProprietaryWeb

    ZeroGPT is a free browser tool for AI detection that also checks images and video, but it does not advertise plagiarism checking or code scanning.

  • Smodin

    An online AI writing toolkit with an AI detector, humanizer, plagiarism checker and rewriting tools.

    FreemiumProprietaryWeb

    Smodin bundles an AI detector and plagiarism checker with rewriting and humanizer tools, and it can be tried without an account, though full use is paid.

Similar software

Related functionality, not a direct replacement.

  • Grammarly

    An AI writing assistant that checks grammar and spelling and suggests rewrites and tone changes.

    FreemiumProprietaryWebBrowser extension

  • Paperpal

    An AI academic writing tool with grammar checks, citations, paraphrasing and journal submission checks.

    FreemiumProprietaryWeb

  • Trinka

    An AI grammar checker and writing assistant aimed at academic and technical writing.

    FreemiumProprietaryWeb