Decision Support · Side-by-side

Copyleaks vs AI Detector by Plagium. Side by side.

Q: Is Copyleaks better than AI Detector by Plagium for checking a student essay?

For a single essay, Plagium is better because it's free and fast. Copyleaks is better if you're a teacher checking 50 essays in different languages and need detailed reports.

Q: Can I use either tool on my phone?

Neither has a dedicated mobile app, but both work in a mobile browser. Plagium's simpler interface is easier to use on a small screen.

Q: Which tool is more accurate at detecting AI-written text?

Copyleaks claims the highest accuracy in independent tests, especially for longer documents. Plagium is good but can flag formal human writing as AI.

Q: Do I need to pay to use Copyleaks?

Yes. Copyleaks has no permanent free tier—only a trial. After that, you buy credits. Plagium offers 10 free searches per day with limited characters.

Q: Can I check a URL with these tools?

Plagium lets you paste a URL directly. Copyleaks requires you to copy the text or upload a file—it does not accept URLs.

Q: Which tool is easier for a non-technical person?

Plagium. You paste text, click Analyze, and get results in seconds. Copyleaks has a steeper setup with multiple steps and settings.

Compare pricing, strengths, and use cases so it is easier to pick the right fit.

Browse alternatives Browse workflows

Change tools

Comparison Ready

Copyleaks

AI Detector by Plagium

Best overall

For most everyday users, AI Detector by Plagium wins on value and simplicity—it offers a free tier and straightforward checks. Copyleaks is the powerhouse for professionals who need deep enterprise-grade detection and code verification, but its hidden pricing and complex setup make it overkill for casual use. The single biggest difference: Plagium is pick-up-and-go; Copyleaks is built for organizations.

Copyleaks

#391 of 3,826 Web

AI Detector by Plagium

10 free searches per day, paid plans available #2302 of 3,826 Web

Scores at a glance

CopyleaksAI Detector by PlagiumPractical Versatility

Onboarding Ease

Ecosystem Fit

Market Value

Choose Copyleaks if

You run a university writing center and need to check hundreds of student papers in multiple languages
You're a software developer who needs to verify that code submissions aren't copied from GitHub
You manage content for a large publisher and require airtight copyright tracking across the web
You're an enterprise that needs role-based access controls and audit trails for compliance

Choose AI Detector by Plagium if

You're a student who wants to quickly check a short essay before submitting it
You write blog posts and want a free daily check to see if your content looks AI-generated
You need to verify a single URL or short document without signing up for a paid plan
You're a freelancer who wants a simple, no-fuss tool that works in your browser

Key differences

Copyleaks has no free tier; Plagium gives 10 free searches per day
Copyleaks scans source code (C++, Python, Java); Plagium does not
Plagium checks for plagiarism and AI in one click; Copyleaks requires you to choose a workflow
Copyleaks offers LMS integrations (Canvas, Moodle); Plagium has none
Copyleaks has a mobile-friendly web interface but no app; Plagium also has no mobile app
Copyleaks is built for institutions; Plagium is built for individuals

Facts side by side

	Copyleaks	AI Detector by Plagium
Free plan
Mobile app
API access

Copyleaks: strengths & weaknesses

Detects AI text in 30+ languages, not just English
Can scan source code (Python, Java, etc.) for plagiarism
Enterprise-grade security and LMS integration for schools
Generates detailed heat-map reports showing which sentences are AI-written
No free tier—only a time-limited trial, then you must buy credits
Credit-based pricing is confusing; you can't easily predict cost per scan
Setup is heavy: 10 onboarding steps, API keys, webhooks—not for beginners
No mobile app, so you can't check text on your phone

AI Detector by Plagium: strengths & weaknesses

Free 10 searches per day—enough for occasional checks
Runs AI detection and plagiarism check in one go, saving time
Very fast for short texts (under 1,000 words)
Supports multiple languages and accepts URLs directly
Free tier limits character count severely (often <500 characters per search)
Sometimes flags formal, well-written human text as AI (false positives)
No mobile app and no integrations with Google Classroom, Canvas, etc.
Interface looks a bit dated and can be confusing with 'Deep Search' vs 'Quick Search'

Common questions

Is Copyleaks better than AI Detector by Plagium for checking a student essay?

For a single essay, Plagium is better because it's free and fast. Copyleaks is better if you're a teacher checking 50 essays in different languages and need detailed reports.

Can I use either tool on my phone?

Neither has a dedicated mobile app, but both work in a mobile browser. Plagium's simpler interface is easier to use on a small screen.

Which tool is more accurate at detecting AI-written text?

Copyleaks claims the highest accuracy in independent tests, especially for longer documents. Plagium is good but can flag formal human writing as AI.

Do I need to pay to use Copyleaks?

Yes. Copyleaks has no permanent free tier—only a trial. After that, you buy credits. Plagium offers 10 free searches per day with limited characters.

Can I check a URL with these tools?

Plagium lets you paste a URL directly. Copyleaks requires you to copy the text or upload a file—it does not accept URLs.

Which tool is easier for a non-technical person?

Plagium. You paste text, click Analyze, and get results in seconds. Copyleaks has a steeper setup with multiple steps and settings.

Plagium wins for everyday users on price and ease; Copyleaks wins for professionals who need power and precision.

If you're a regular person who just wants to check a paragraph or a short document now and then, start with Plagium's free tier—it's simple and does the job. If you're an educator, developer, or business with serious verification needs, invest the time to learn Copyleaks; its depth is worth the hassle.

Visit Copyleaks Visit AI Detector by Plagium

Detail pages: Copyleaks · AI Detector by Plagium

Copyleaks

AI Detector by Plagium

Free plan

Mobile app

API access