In a world where AI is so predominant, it can be hard to determine what is human. And if you’re publishing a blog, it’s imperative that you know that the content is human, not AI generated. It could be the difference between ranking and going MIA on the SERP..
We reviewed five AI content detector software. And we’ve determined which one comes out on top when it comes to saving you from AI content.
Originality.ai
Let’s start with the best. Originality.ai passed the test that we put it through. Using ChatGPt, we submitted an article that was 100% AI, and Originality.ai detected it within seconds.
Originality makes it easy to detect exactly what is human or AI. They color-code lines of text to give you what percentage of it is AI.
Because Originality is so powerful, they are 99.9 percent accurate. Their new Lite 1.0.1 that was launched in June 2025, has an exceptionally low 0.5 percent false positive. The new version is designed to keep up with the latest AI Models, which include:
- OpenAI
- Gemini
- Claude
- Deepseek
- And more
In October 2024 Originality Turbo 3.0.1 was launched. It’s great if you have a zero AI tolerance and can identify even light AI editing, and have a 99.9% accuracy rate.
Compared to other AI detectors, Originality.ai was hands down the most accurate. We liked that it broke down the exact copy that was AI.
Originality will also detect if the writer tries to use AI to paraphrase previously published human copy. It will also catch content that is written by AI but edited by a human.
Originality believes that AI has its place, but should never be passed off as human and published unbeknownst to the content’s owner. This philosophy shows in the AI detectors it offers.
Referring to Originality, PC World said “If anything, it’s the most accurate AI detector I’ve encountered thus far and that’s saying something”.
GPTZero
Although GPTZero claims to correctly classify human content 99% of the time we found after several tests that it had an 80% accuracy or lower. It had many false negative instances. This means that AI-generated texts were mistaken for human-generated writing.
We entered the same content we had used with Originality.ai into GPTZero, and these were the results.
It couldn’t detect for sure if the content was AI but gave the copy its best “guess”. It broke the document down into 48% AI generated, 30% mixed and 22% human.
In reality the entire content was generated by AI.
This disparity may be because GPTZero classifies text based on a measure of text randomness. In other studies by the National Library of Medicine, they found that “more than one-third of AI-generated texts are mistakenly classified as human writings”.
It went on to say that GPTzero has a low, 10% false-positive rate and a high, 35% false-negative rate.
QuillBot
QuillBot has an intuitive interface and provides a detailed report. However, despite the bells and whistles, QuillBot was a disappointment when it came to identifying AI content. Once more, we put it through the test using the exact copy as we had Originality and GPTZero. But QuillBot failed miserably.
QuillBot showed zero percent AI when in reality it was 100% AI. It clearly had the text 100% human-written.
And although, like Originality.ai, QuillBot highlights each paragraph with color that tells you whether the text is AI, that benefit meant nothing in our test.
Grammarly
Grammarly has long been used for catching spelling and grammatical mistakes. But, since they added the AI detection feature, we were curious to see how it stacked up to the other AI detectors.
And although it didn’t perform as poorly as QuillBot, it was nowhere near the Originality’s performance.
Once more, we used the same text as we had for the other AI detectors. Keeping all of them on the same playing field. Here are our results.
Grammarly showed that 55% of the content was AI. Thousands of people use Grammarly to check all aspects of content, including AI. But based on our findings, perhaps Grammarly should stick to its namesake, Grammar.
Scribbr
Originally a proofreading and writing assistance service, it expanded its services. This was the result of being acquired by the company Course Hero. They integrated tools including AI detection. Scribbr and QuillBot are owned by the same company.
Scribber claims to be the most accurate AI detector with their premium ringing in at 84%. By their own admission, their free version is 78% accurate. So we put their free version to the test using the same content.
Scribbr found that 0% of the text was AI. It was all human-generated. This wasn’t even close to the accuracy rate they had claimed. And it didn’t pick up on the 100% ChatGPT-generated text.
Final Thoughts
After reviewing five AI detecting software, it’s evident that Originality.ai comes out on top as the most accurate AI detector.
Interesting that ChatGPT is considered one of the more difficult to detect. But Originality.ai caught it within seconds. GPTZero, QuillBot, Grammarly and Scribbr all got it wrong. And all of them were slower than Originality in giving the results.
It’s clear that Originality.ai should be in your arsenal if you’re concerned about AI content.