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Originality.ai is excited to announce that we’ve released a major upgrade to our Plagiarism Checker.
The upgrades our team has made significantly improve its performance, meaning that it’s now more accurate and faster than ever!
So, what exactly does that mean for you? Let’s take a closer look!
Try the Originality.ai Plagiarism Checker today!
In August 2024, we rebuilt Originality.ai’s plagiarism detection system from the ground up, prioritizing:
This first major overhaul allowed us to outperform tools like Copyscape, Grammarly, and PlagScan (Turnitin) in catching paraphrased content.
Then, in May 2025, we released the Originality.ai Plagiarism Checker Version 2.
This update in a snapshot:
This release has been shown by studies using 3rd party datasets and evaluation to have big gains in accuracy and more coverage than competitors’ tools.
Keep reading to learn more!
So, just how have we improved our plagiarism detection system? Here’s the scoop:
We implemented a robust comparison algorithm that better handles:
The system now indexes a broader and more relevant set of webpages and online documents. This improved coverage ensures that scans compare against a more comprehensive and up-to-date pool of content — after all, the web is always changing and being the most accurate tool means we prioritize routine updates to stay ahead.
We've enhanced how we search for and retrieve potential matching content.
The new querying system is more intelligent in surfacing suspicious sources, especially for outlier cases like obscure web pages.
We upgraded our backend systems to be more scalable and efficient. This allows us to handle larger documents with faster scan times — even when there’s high scan traffic.
That means you can now scan larger documents even faster than before, so you can check content for plagiarism without missing a beat.
You don’t just have to take us at our word that we’re the most accurate plagiarism checker — you can see the results of our study and evaluation below!
We ran tests using the same public plagiarism datasets used to evaluate version 1.
Quick overview: The results showed a major boost in accuracy!
Version 2 achieved 99.5% accuracy on global plagiarism detection.
The study used 3rd party datasets commonly used in benchmarking studies for evaluating plagiarism checker efficacy.
To ensure a fair comparison, we selected a standardized set of texts with varying degrees of originality, paraphrasing, and plagiarism.
The benchmark compared detection performance at thresholds of 5% and 15%.
These thresholds represent the percentage of content similarity at which a document is flagged as potentially plagiarized. For example, a 15% threshold means that if more than 15% of a document’s content matches other sources, it is considered potentially plagiarized.
Comparative Analysis of the Originality.ai Plagiarism Checker V2 vs. V1 at a 5% Threshold
As depicted in both of the graphs above for the 15% and 5% thresholds, Originality.ai V2 demonstrates significant improvements across global, paraphrase, and patchwork plagiarism types.
So, how does the Originality.ai Plagiarism Checker compare to other popular plagiarism checkers?
Check out the tables below to see Originality.ai Plagiarism V1 vs. Plagiarism V2 results in comparison to industry competitors:
Check out our Copyscape, Grammarly, and Turnitin plagiarism reviews for even more comparative insights.
We’re very proud of the notable improvements our team has made with the Originality.ai Plagiarism Checker V2, which offers:
We hope you enjoy our latest release! If you have any questions, you can always reach out and contact support to chat with our exceptional customer service team.
Did you know? Originality.ai offers a suite of patented tools that are the most accurate for what each does!
