Alternatives to WINNOWR

Copyscape suits writers, publishers, and organizations checking online content or monitoring selected pages for copies.

GPTZero

It suits educators, hiring teams, publishers, journalists, and others assessing writing authenticity.

Noplag

The free plan may suit occasional checks of shorter documents, while Pro is positioned for makers and small teams.

Dolos suits teachers checking programming tests, exams, and exercises where collaboration is permitted within small groups.

It suits students, bloggers and freelance writers who want to check text from a document, URL or pasted passage.

Originality.ai

Originality.ai may suit website owners, content marketers, writers and publishers who need text checks or site scanning.

Plagium is aimed at educational institutions, publishers, editors, companies, researchers, and compliance teams checking text.

JPlag suits educators and developers comparing submitted programs locally for similarity, plagiarism, collusion, or duplicated software parts.

Codequiry

Codequiry is aimed at educators, universities, and engineering teams that need to review submitted code for similarity or AI-associated code.

The free option suits people trying the hosted service or self-hosting.

Winston AI

Winston AI presents its tools for education, SEO publishers, and writers and content creators.

Pangram

Pangram may suit people checking text or images for AI-generated content, or checking for plagiarism.

The checker may suit students, teachers, writers, bloggers, digital marketers, researchers, and academics who need to review text for matching sources.

Plagius suits students, researchers, and other document reviewers who need plagiarism checks and AI-writing signals.

Quetext AI Detector

It may suit educators, publishers, students, and other reviewers who need AI and plagiarism checks.

PlagiarismCheck.org

It suits students, educators, institutions, researchers, businesses, and developers needing browser, integration, or API-based originality checks.