Can AI detection tools really spot content that’s been paraphrased or human-edited? That’s where things get tricky. Not all tools are built to handle it well. Two popular options, Originality AI and Copyleaks, can accurately detect AI-generated content. But here’s the catch: paraphrased text often slips right past them.
To find out which tool performs better, we put both to the test. We used real-world examples, ranging from pure AI content to text that felt more human. The results might surprise you!
Ever wondered if your content might sound a little too AI? That’s where Originality AI comes in. With a 98.8% accuracy rate at detecting text from models like GPT-4 and ChatGPT, it’s a powerful ally for web publishers, SEO pros, and content creators. Not just AI detection, it also checks for plagiarism and even verifies facts, helping you keep your content original, and trustworthy.
Originality AI detects AI-generated content and plagiarism
If you need a broader solution, Copyleaks has your back. Trusted by organizations in over 100 countries, it specializes in content verification, plagiarism detection, and AI content certification. With tools like AI Grading and multilingual plagiarism scanning, Copyleaks ensures your material stays authentic and compliant. It’s a solid choice for anyone serious about maintaining professional and academic integrity.
Copyleaks Homepage
Hey there! Before we dive into the details, let’s take a quick look at the Fast Feature Comparison Table to see how these two platforms compare. It’ll help us get a clearer picture!
| Criteria | Originality AI | Copyleaks |
| AI Detection | 96–99% accuracy; strong at detecting paraphrased and adversarial content | 99% accuracy on standard AI text; best for academic content |
| Plagiarism Detection | Detects global, patchwork, and paraphrased plagiarism; Google-indexed scanning | Detects direct, paraphrased, and cross-language plagiarism; scans 60T+ pages |
| Reporting | Highlights matched sentences with probability scores; links to sources | Highlights matches; shows similarity %; downloadable detailed reports |
| Special Features | Readability & Grammar CheckeChecker | Writing Assistant |
| API & Integration | Lightweight REST API for SEO and publishing workflows | Full API with SDKs; LMS integrations (Canvas, Moodle) |
| Best For | Content creators, SEO, publishers | Academic institutions, enterprises |
When it comes to detecting AI-generated text, Originality AI is a standout tool. It’s great at spotting content created by models like ChatGPT, GPT-4o, Gemini Pro, Claude 3.5, Llama 3.1. One of its best features is how it highlights sentence-level probabilities. This helps you see how likely a sentence is to be AI-generated. Originality AI has different modes for users. The Lite mode boasts an impressive accuracy of 98%. If you need even more precision, the Turbo mode goes over 99%. Plus, it can work in over 15 languages, making it versatile.
On the other hand, there’s Copyleaks, which also shines in this area. It claims over 99% accuracy when detecting AI-generated content. It can handle text in more than 30 languages. Many universities trust Copyleaks because of its AI Grading and Content Certification features. However, there’s a catch. Some tests show that Copyleaks may struggle a bit with paraphrased or more human-like content compared to Originality AI. Overall, both tools are reliable, but they each have their strengths.
After looking into how well different AI detection tools work, we decided to run a test. We wanted to see how they handle different types of content. Here’s what we did:
100% AI-Generated Content
In our first test, we used content that was made entirely by AI, without any help from humans. Here’s what we found:
Test result from Originality AI detecting 100% AI content.
Test result from Copyleaks detecting 100% AI content
In the first test, both Originality AI and Copyleaks proved to be reliable in spotting fully AI-generated content. Keep reading to see how they performed with more complex, human-edited and fully human-written content!
Mixed Content (Human-Edited AI Content)
When we talk about mixed content, there’s an interesting scenario to discuss. It involves content that was initially created by AI but later edited by a human. This is where things get a bit tricky.
Test result from Originality AI detecting 53% human content in the mixed content
Test result from Copyleaks showing 0% AI Content Found for the same mixed content.
In the second test, we saw something interesting with human-edited AI content. Originality AI excelled at recognizing that the text combined human and AI elements. This makes it great for real-world content.
Copyleaks, however, struggled. It reported “0% AI Content Found,” even when there were still hidden AI traces. While it works well with pure AI text, it often misses the signs in mixed content. This is a significant drawback in today’s evolving content landscape.
100% Human-Written Content
When it comes to checking if content is written by humans, Originality AI really shines. It tested a piece of text that was totally made by a person. And guess what? It reported that 99% of the content was human-written! That’s a great score and means there were hardly any mistakes.
Test result from Originality AI showing 99% human content accuracy
On the other hand, we have Copyleaks. It also looked at the same content and said there was “0% AI Content Found.” This sounds good, but it didn’t share how confident it was about the claim that a human wrote it.
Test result from Copyleaks showing 0% AI Content Found for human content
So, in a quick comparison, Originality AI showed strong results with high confidence, while Copyleaks kept things a bit more vague. It’s interesting to see how these tools measure human authorship, isn’t it?
When it comes to plagiarism detection, Originality AI has a unique system that spots tricky types of plagiarism that many traditional tools miss. It’s pretty impressive, achieving 90% accuracy for global plagiarism and 74% for patchwork plagiarism. What sets Originality AI apart is its ability to detect subtle forms of plagiarism, like paraphrasing. It uses advanced machine learning, making it smarter than older checkers.
Plus, it works in multiple languages! You can scan non-English texts easily. Another great feature is the fact-checker; it verifies the accuracy of information, not just originality. With real-time Google search indexing, Originality AI ensures every scan reflects the freshest web content — a perfect fit for content creators, publishers, and SEO professionals.
Then there’s Copyleaks. This tool offers its own advanced plagiarism detection. It finds both direct copying and clever rewording in over 100 languages. What’s cool is its ability to detect cross-language plagiarism. It does this by matching similar ideas in different languages.
Copyleaks has access to a huge database, including over 60 trillion web pages and more than 16,000 open-access journals. It even scans academic repositories and research papers. Its AI-powered algorithms are great for spotting subtle plagiarism, making it a solid choice for academic work and business needs. Both tools have unique strengths.
We wanted to test the plagiarism detection tools, so we did something interesting. We copied a part of a real report about the Food & Beverage industry. Guess what? Both tools caught the duplication! This shows they can handle professional content just as well as casual stuff from the web. It’s good to know they work effectively in real-world situations.
Plagiarism detection result from Originality AI.
Plagiarism detection result from Copyleaks
This shows they can handle professional content just as well as casual stuff from the web. It’s good to know they work effectively in real-world situations.
Originality AI is great at showing you matched content right away. It highlights phrases and sentences in the documents you scan. Plus, it uses a neat model to show how likely it is that something might be plagiarized. You can even click to see the sources of these matches. This makes it really easy to confirm if something’s original or not.
Copyleaks takes a slightly different approach. It provides detailed reports that not only display matched text but also show you similarity percentages. You can filter out minor matches and even check translated content. The reports are downloadable as PDFs, making them perfect for sharing or adding to your existing workflow.
Originality AI highlights matched text with probability score
Copyleaks Report PDF File 1
Copyleaks Report PDF File 2
When it comes to working smoothly with other tools, Originality AI shines with its simple REST API. It’s designed for content creators, SEO experts, and publishers. The focus is on speed and accuracy, making it perfect for quick checks and bulk verification. You can choose from different models based on your needs. It’s all about keeping things efficient.
Copyleaks has a robust API, too. It’s versatile and supports various features like plagiarism detection and OCR scanning. It can easily integrate with platforms like Canvas and Moodle. Plus, it’s available in multiple programming languages, so you can set it up in a way that works for you. It’s cloud-based and follows GDPR rules too.
When it comes to polishing content, Originality AI offers more than just plagiarism and AI detection. Its Readability Checker evaluates how easy your text is to read, using trusted standards like the Flesch Reading Ease and Gunning Fog Index. Writers can instantly see if their content matches the right reading level for their audience. Alongside that, the free Grammar and Spelling Checker catches grammar errors, typos, and punctuation mistakes without needing a login. Together, these tools make sure your content isn’t just original — it’s also polished, clear, and tailored for real readers.
Meanwhile, Copyleaks steps up with its Writing Assistant. This AI-powered tool doesn’t just fix grammar and spelling; it also suggests paraphrasing options and helps adjust tone and style to fit different writing goals. Whether you’re aiming for an academic, business, or casual tone, the Writing Assistant fine-tunes your content while seamlessly integrating AI detection. It’s a powerful companion for anyone serious about writing with clarity, authenticity, and professionalism.
| Originality AI | Copyleaks | |
| Pros | ✅ Detection accuracy 96–99%
✅ Excellent at detecting paraphrased and humanized AI content ✅ Real-time plagiarism scan using Google-indexed content ✅ Built-in Fact-Checker for verifying factual claims ✅ Free Trial Readability Checker ✅ Free Trial Grammar and Spelling Checker (no login required) ✅ Supports multiple AI detection models (Lite, Turbo, Multilingual). |
✅ Detection accuracy over 99% for standard AI-generated content
✅ Cross-language plagiarism detection (supports 100+ languages) ✅ Access to a massive plagiarism database ✅ Integrated Writing Assistant ✅ Supports LMS integrations (Canvas, Moodle, Blackboard) ✅ AI Content Certification is available for verifying authorship |
| Cons | ❌ No LMS (Learning Management System) integrations
❌ No paraphrasing suggestions or tone adjustment features |
❌ Struggles with detecting heavily paraphrased or humanized AI content
❌ No built-in fact-checking tool for verifying information accuracy |
| Feature | Pay as you go | Pro | Enterprise |
| Price | $30 (One-time payment) | $14.95/month | $179/month |
| Credits | 3,000 credits (One-time) | 2,000 credits/month | 15,000 credits/month |
| Expiration | 2 years expiry | 1 month expiry (renews monthly) | 1 month expiry (renews monthly) |
| Credits per Unit | 1 credit = 100 words | 1 credit = 100 words | 1 credit = 100 words |
| Included Features | AI, Plagiarism, Readability Check, Grammar & Spelling, and SEO Content Optimizer. | All features in “Pay as you go” + Site Scans, File Upload support, Team Management | Everything in Pro + Priority Support, 365 Days Scan History, API Access |
| Best for | One-time use | Individuals and small teams | Agencies and publishers |
Note: Pricing and features may change over time. For the latest information, please refer to the official websites of Originality AI. The pricing table above reflects monthly payment plans.
Originality AI Pricing Plans for Annual Payment
| Plan | Price | Credits | Key Features |
| AI + Plagiarism Detection | $16.99/mo | 100 credits | Detect both AI & plagiarism, multilingual support, paraphrasing detection, 99% AI accuracy, 2 users |
| Plagiarism Checker | $10.99/mo | 100 credits | Plagiarism detection, source code & cross-language support, paraphrasing detection, 2 users |
| AI Detector | $9.99/mo | 100 credits | AI detection (30+ languages), 99%+ accuracy on GPT/Gemini/Claude, 2 users |
| Enterprise & LMS | Contact us | Custom | API access, LMS integrations, advanced permissions, dedicated success team |
Notes:
Coplyleaks Pricing Plans for Annual Payment
Originality AI offers tiered pricing with Pay as you go, Pro, and Enterprise plans, each providing advanced features like site scans, team management, and API access. This straightforward system suits both individual users and teams.
Copyleaks uses a modular pricing approach based on credit usage, allowing users to choose specific tools like AI detection or plagiarism checking and select their monthly credit amount. This flexible model caters to unique organizational needs but may be more complex for individual users.
Originality AI vs Copyleaks are effective tools for AI detection and plagiarism checking, catering to different needs. For content creators and SEO experts needing accuracy and real-time web scanning, Originality AI is ideal. Conversely, Copyleaks suits academia and professional organizations that require cross-language detection and LMS integration. Choose based on your goals: deep detection for web content or structured compliance for academic submissions. It’s worth trying both to find the best fit for your workflow.
It depends on your needs; Originality AI excels at detecting paraphrased AI content, while Copyleaks is better for academic use with cross-language support and LMS integrations.
Copyleaks provides strong plagiarism detection with AI features and is a flexible alternative to Turnitin, especially for institutions needing real-time scanning.
Originality AI offers free tools like its Readability Checker and Grammar & Spelling Checker, but the main detection tools require payment.
