You’re using AI to write stuff. That blogger you follow is using AI. Your forite thought leader on LinkedIn is using AI too.
It’s 2025, and almost everyone is using AI writing tools as their ghostwriters.
The only problem is that everyone is catching up on AI plagiarism detection tools designed to flag our AI writing.
If you’ve ever had that mini heart attack when someone says, “this doesn’t sound like you wrote it,” you know exactly what I’m talking about.
Whether it’s your professor, your client, or your boss, nobody wants to be called out for passing off AI work as their own.
That’s where AI plagiarism checkers come in.
In this blog, we’re breaking down the 10 best AI plagiarism checker tools of 2025—what they catch, what they cost, and which ones actually help.
What to Look for in an AI Plagiarism CheckerBefore we dive into the top tools, let’s talk about what makes a good plagiarism checker.
1. How Accurate Is This? A good AI and plagiarism checker should spot paraphrasing and AI-generated content that feels human.
2. Can It Catch AI Content? – The best AI detectors and plagiarism checker tools can differentiate between human and machine-generated text.
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3. How Strong Is Its Database? – The more sources it checks, the better. A plagiarism and AI checker for students will need to pull from a broader range of resources to ensure comprehensive results.
4. Does It Provide Rewriting Support? – If you’re learning or writing under pressure, that support can be a time-ser.
5. Is It Easy to Use? – Best AI plagiarism checker feels simple—drag, drop, done.
Best AI Plagiarism Checkers in 2025 1. Undetectable AI Plagiarism Checker (Recommended)
Undetectable AI is an award-winning AI detector featured in Business Insider, ABC, CBS, NBC, Yahoo Finance, Fox, Lifewire, and Nature.
It was rated #1 AI detector by Forbes with over 5,000,000 users as of early 2024.
This AI detector tool is known for its multi-engine AI detection and real-time readability rewrites.
Third parties he reported that it provides 85–95% detection accuracy.
– Pros
Checks across GPTZero, OpenAI, Writer, QuillBot, Copyleaks, Sapling, Grammarly, and ZeroGPT all at once Options like “More Human,” “Balanced,” and “More Readable” for different audiences Not just detects but helps rewrite content to bypass AI detection Instant access without registration Easy to use with real-time feedback Shows the likelihood rating from each checker– Cons
Requires 200+ words for accurate results Not a conventional plagiarism checker (won’t detect copied content)– Pricing
$5/month (annual) — Budget-friendly for bloggers, students, researchers. $19/month (monthly) — Ideal for short-term or deadline users. Custom pricing (business) — Built for agencies, labs, institutions.We offer a 50% discount on yearly packages. For enterprises with a need for a higher monthly word volume, we offer customized enterprise plans.
Click here to see our pricing in detail.
Additionally, we offer an iron-clad money-back guarantee. If we humanize (conceal) the AI content and it’s still detected, we will refund the cost of humanization completely.
Best fit for: AI-assisted writers, agencies, and researchers oiding detection.
2. Turnitin
Turnitin is the academic gold standard in plagiarism detection, trusted by over 16,000 institutions worldwide.
With powerful AI plagiarism detection, this AI plagiarism detection tool is the go-to tool for ensuring academic integrity and keeping your work original.
– Pros
Strong against ChatGPT-style outputs. Integrated in LMS workflows Custom licensing options — Includes iThenticate, Feedback Studio, more.– Cons
Occasional false positives. Some AI-rewritten content slips through. AI detection is not included by default– Pricing
Institutional pricing — Varies by institution size and usage. AI detection add-ons — Extra cost for full capabilities.Best fit for: Universities, schools, and academic departments looking for the best AI and plagiarism checker.
3. Originality AI
Originality AI is an industry-leading AI plagiarism checker with 99% AI detection accuracy across GPT-4o, Claude 3, Gemini, and Llama.
This AI detector tool is endorsed by WriterAccess, agencies, and major publishers for reliable detection and advanced plagiarism checks.
– Pros
Proven 99% accuracy for AI content from major LLMs. Minimizes false positives — Lite model shows