GPTZero vs. Originality.ai AI Detection Compared

Key Takeaways

GPTZero and Originality.ai are both available worldwide and can be accessed through major browsers.
GPTZero has a free version with limited features and paid plans ranging from $15 to $35 per month, while Originality.ai offers a base subscription for $14.95/month or a pay-as-you-go option for $30/annual single payment.
Both tools have limitations in detecting AI-generated content accurately, but Originality.ai is slightly more accurate and offers more features at a slightly lower price than GPTZero.

Whether you're writing an essay, blog post, article, or cover letter, use of AI tools for your text is often a no-go. If you're assessing someone else's writing for originality, an AI detector may be beneficial. Two popular AI text checkers are GPTZero and Originality.ai, but which of these is best for you?

GPTZero vs. Originality.ai: A Quick Comparison

It's best to understand the basics of GPTZero and Originality.ai before getting into the deeper details. So, how do the two AI detectors measure up on the surface?

	GPTZero	Originality.ai
Availability	Worldwide	Worldwide
Pricing	Basic: Free. Essential: $15/month \| $180/year. Premium $24/month \| $192/year. Professional: $35/month \| $276/year.	Base subscription: $14.95/month. Pay-as-you-go starter: $30 only (lasts two years). No free version or trial period.
Detection Rate	Original content: Failed to detect. AI-generated content: 98 percent successful. Mixed content: Failed to detect original parts.	Original content: Mostly failed to detect. AI-generated content: 100 percent successful. Mixed content: Failed to detect original parts.
Word Limit	Basic version: 5,000 characters. Essential: 150,000 characters. Premium: 300,000 characters. Professional: 500,000 characters.	Base subscription: 200,000 words/month. Pay-as-you-go starter: 300,000 words without top-ups.
Extra Features	Essential: Batch scanning ten files, Chrome extension, premium AI detection. Premium: plagiarism scanning, unlimited batch file scanning, invite team members. Professional: top-up credits.	Base subscription: Unlimited scan history, API access, URL scans, full site scans, tag scans, team management, file upload, access to future features, plus all features of pay-as-you-go starter. Pay-as-you-go starter: 30-day scan history, plagiarism scan, readability scan.

Now the basics have been covered, let's discuss these two plagiarism detectors in more detail.

Availability

Both GPTZero and Originality.ai are available around the world and can be accessed via all major browsers.

If, for some reason, you're having trouble accessing either tool in your current location, try using a VPN to get around geographical content blocks by connecting to a server outside your country of residence.

Price and Plans

GPTZero can be used for free with its basic version. This allows you to enter a block of text up to 5,000 characters long per scan. You can conduct a scan seven times hourly, but this may prove frustrating if you're trying to scan a large document and have to enter small excerpts each time to stay under the character limit. It's also important to note that the free version of GPTZero only allows users to scan a total of 10,000 words monthly.

GPTZero has three paid plan tiers: Essential, Premium, and Professional. You can pay for these plans monthly or annually, but you can save 33 percent overall if you opt for the monthly plan (though this requires one payment in full).

The plan pricing for GPTZero's tiers is as follows:

Essential: $15/ month or $120/year (works out at $12/month).
Premium: $24/month or $192/year (works out at $16/month).
Professional: $35/month or $276/year (works out at $23/month).

If you only want to use an AI detector once in a while for shorter pieces of text, you'll likely be fine with the free version. However, this will likely prove very limiting if you want to frequently use an AI detector with longer pieces of text.

Originality.ai has two paid plans and does not offer a free version or trial of the tool. Unfortunately, this means you'll have to trust that the tool will be worth the money, as you have no way of testing it out free of charge.

Below are Originality.ai's two paid plans:

Base subscription: $14.95/month.
Pay-as-you-go: $30 single payment.

The base subscription is a no-commitment monthly plan. There is no contract, and you can cancel at any time. The pay-as-you-go subscription incurs a $30 payment for an annual subscription. This may seem incredibly affordable, but this plan comes with limited credits you must pay to top up. The pay-as-you-go plan also has fewer features, which we'll discuss a little later.

GPTZero vs. Originality.ai: Detection Success Rate

To measure GPTZero and Originality.ai's ability to detect AI-generated content, we conducted a small test. We provided each tool with three different blocks of text. One was completely original, one was written entirely by the ChatGPT AI chatbot, and one was a mix of both. We also entered a block of nonsensical text to see how each AI detection tool would measure up.

The first nonsensical excerpt was created originally, while the second was created by ChatGPT.

Here's what we got in response.

GPTZero's AI Detection Rate

Let's start with GPTZero's AI detection accuracy.

Original Piece

GPTZero concluded that the original piece we scanned had a 98 percent chance of being written by AI. Therefore, GPTZero failed to determine that the text scanned was original.

AI-Generated Piece

GPTZero concluded that the AI-generated text scanned had a 98 percent chance of having originated from an AI tool. This means that GPTZero was close to entirely successful at detecting the presence of AI-generated content.

Mixed Piece

The mixed piece entered into GPTZero contained some of the original text excerpt and some of the ChatGPT-generated text excerpt. GPTZero concluded that there was a 91 percent chance the content scanned was AI-generated. What's interesting here is that GPTZero identified the mixed piece as less likely to be original than the actual original piece.

Original Nonsensical Piece

GPTZero concluded that the original nonsensical text sample was 100 percent created by a human, which is correct.

AI-Generated Nonsensical Piece

GPTZero determined that there was a 49 percent chance that the AI-generated nonsensical text was a mix of human and AI-based work. In this case, its conclusion was incorrect.

Orginality.ai's AI Detection Rate

Now, let's take a look at Originality.ai's ability to detect AI-generated content using the same text samples.

Original Piece

Originality.ai concluded that the entirely original piece entered into the scanner had an 81 percent chance of being AI-generated. This is 17 percent lower than ZeroGPT's conclusion but is still highly inaccurate.

AI-Generated Piece

Originality.ai was 100 percent successful in detecting the text sample that was entirely created by ChatGPT.

Mixed Piece

Originality.ai concluded that the mixed excerpt scanned had a 100 percent chance of being created by AI and was therefore unsuccessful in distinguishing the original content from the AI-generated content.

Original Nonsensical Piece

Originality.ai determined that there was a 76 percent that the original nonsensical piece was original and a 24 percent chance it was AI-generated.

AI-Generated Nonsensical Piece

Originality.ai was successful in concluding that there was a 100 percent chance of the AI-generated nonsensical text being created by an AI system.

Additional Features

GPTZero and Originality.ai don't just offer AI detection. These platforms also come with a number of additional useful features.

Here's what features each tier of GPTZero's service offers:

Free: AI detection, scan up to 10,000 words monthly.
Essential: AI detection, plagiarism detection, scan up to 150,000 words monthly, ten batch file scans,
Premium: AI detection, plagiarism detection, scan up to 300,000 words monthly, unlimited batch file scans, invite team members.
Professional: AI detection, plagiarism detection, scan up to 500,000 words monthly, unlimited batch file scans, invite team members, top-up credits.

"Credits" refers to the number of characters and words you can scan per calendar month. With GPTZero's Professional plan, you can purchase extra credits if you hit the 500,000-word limit.

Originality's varying plan features are as follows:

Base subscription: AI detection, scan up to 200,000 words monthly (with top-up option), automated fact checker, plagiarism scan, readability scan, unlimited scan history, shareable reports, file uploads (in DOC, DOCX, and PDF format), API access, full site scans, scans from URL, tag scans, team management, access to future features.
Pay-as-you-go: AI detection, scan up to 300,000 words monthly (with top-up option), plagiarism scan, readability scan, 30-day scan history, shareable reports.

While you get a higher monthly word limit with the pay-as-you-go plan, there are many more features offered through the base subscription plan, which is why the former plan is much cheaper for a longer period.

What's the Verdict?

It seems both GPTZero and Originality.ai lean towards flagging the presence of AI-generated text, even if the scanned content is entirely original or has a mix of original and AI-generated text. Though neither tool is consistently highly accurate in detecting AI-generated vs. original content, Originality.ai seems to be the more accurate option overall.

Originality.ai's cheapest paid plan (the Base subscription) is also slightly cheaper than GPTZero and offers all the same features, plus some extra on top. So, if you're looking for a higher AI detection accuracy with all kinds of extra features, Originality.ai is likely the best option for you.

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