What is the best AI tool for checking for plagiarism?

On AIToolMaps, GPTZero ranks first for checking for plagiarism, followed by Originality.ai and Grammarly. The ranking weighs how central the job is to each tool, how complete and checked its listing is, and what members upvote, save and review.

Is there a free AI tool for checking for plagiarism?

Yes. 3 of the 5 tools listed for checking for plagiarism have a free plan or are free to use, including GPTZero, Originality.ai and Grammarly.

Which AI tools for checking for plagiarism have an API?

4 of them offer an API for developers, including GPTZero, Originality.ai and Surfer.

Can I do checking for plagiarism on my phone?

Yes. 1 of the tools have an iPhone or Android app, including Grammarly.

Task · AI Detection

Best AI tools for checking for plagiarism

Ranked by how central this job is to each tool, how complete and checked its listing is, and what members upvote, save and review.

Tools: 5
Free options: 3
Updated: Nov 5

Sort

1
GPTZeroVerified Nov 4, 2026
AI-writing detector for teachers, students, and editors who need to check text and writing process.
Free tierWeb, Browser extension
Visit
2
Originality.aiVerified Nov 4, 2026
Checks text for AI-written content and plagiarism for writers, editors, teachers, and publishers.
Free tier · from $12.95/moWeb, Browser extension
Visit
3
GrammarlyVerified Nov 3, 2026
An AI writing assistant that checks grammar, tone, and clarity for individuals, teams, and organizations.
Free tier · from $12/moWeb, Windows, Mac, Android, iOS
Visit
4
SurferVerified Nov 4, 2026
SEO and AI search visibility platform for teams that want their content cited in Google and in AI answers.
Paid · from $49/moAPI
Visit
5
AnywordVerified Nov 4, 2026
AI content platform that scores marketing copy before your team publishes it.
Free trial · from $49/moWeb, API, Browser extension
Visit

How to choose

GPTZero and Originality.ai are built around detecting AI-written text and also offer plagiarism scans; both have free accounts, with Originality.ai's free plan capped at a one-time word allowance. Grammarly puts plagiarism and AI detection alongside grammar, tone, and rewriting, so it suits people already using it for everyday writing, though those checks sit in Pro. Surfer and Anyword are marketing and SEO platforms that include a plagiarism checker rather than focusing on it; Surfer is paid with no free plan, while Anyword offers a trial but no free plan. Consider platform fit—web, browser extension, Google Docs, or API—how often you'll scan, and whether you need a dedicated checker or a suite.

Checking grammar and spelling Writing articles and blog posts Improving SEO Writing emails Writing marketing copy Analyzing competitors Writing ad copy

Common questions

What is the best AI tool for checking for plagiarism?: On AIToolMaps, GPTZero ranks first for checking for plagiarism, followed by Originality.ai and Grammarly. The ranking weighs how central the job is to each tool, how complete and checked its listing is, and what members upvote, save and review.
Is there a free AI tool for checking for plagiarism?: Yes. 3 of the 5 tools listed for checking for plagiarism have a free plan or are free to use, including GPTZero, Originality.ai and Grammarly.
Which AI tools for checking for plagiarism have an API?: 4 of them offer an API for developers, including GPTZero, Originality.ai and Surfer.
Can I do checking for plagiarism on my phone?: Yes. 1 of the tools have an iPhone or Android app, including Grammarly.