TruthScan vs. Decopy AI: Which AI Writing Detector Works Best?

AI writing detection has quickly become a cat-and-mouse game. 

On one side, large language models keep getting better at sounding natural. On the other, detection tools race to keep up, each one promising sky-high accuracy and peace of mind. But as anyone who has actually tested these platforms knows, marketing claims and real-world performance aren’t always the same thing.

Which is why it’s worth comparing two very different players in the space: TruthScan and Decopy AI. TruthScan positions itself as a heavyweight, with a detection suite that goes far beyond just text. Decopy AI, meanwhile, is a leaner platform that focuses more narrowly on written content while throwing in a couple of convenience tools along the way.

On paper, both say they can reliably catch AI-generated text. But how do they really stack up?

What is TruthScan?

Think of TruthScan less as a “tool” and more as an ecosystem for AI detection. It’s built with the idea that AI-generated content won’t just show up in a Word doc — it’s going to seep into emails, images, videos, voices, and even live chats. TruthScan tackles all of that in one place.

For text specifically, it’s one of the most accurate detectors on the market. In my experience, it doesn’t just look for obvious AI tells like flat phrasing or overuse of transition words — it’s tuned for nuance. It pays attention to flow, variation, and even subtle inconsistencies that most detectors miss. 

And because it’s part of a larger suite, the text detector isn’t an isolated add-on. It works in tandem with other modules, meaning if your concern is broader than just essays or blog posts, TruthScan already has that ground covered.

What is Decopy AI?

Decopy AI takes a more straightforward approach. At its heart, it’s a text-focused platform aimed at people who want quick, accessible checks. Students, content creators, freelancers — that’s the target audience.

Its main claim is 99% detection accuracy for ChatGPT and other models. Around that, Decopy adds a couple of extras: a humanizer that rewrites robotic text to sound more natural, and a summarizer that compresses long documents into bite-sized notes. 

And that’s not necessarily a bad thing. Not everyone needs enterprise-grade monitoring or API integrations. Some people just want to know whether their essay, blog draft, or client deliverable will flag as AI. For that use case, Decopy is a clean, approachable option.

TruthScan vs. Decopy AI: Detecting GPT Content

Test #1

Truthscan: Correctly classified text as AI-generated.
AI Likelihood Score: 97%

Decopy AI: Correctly classified text as AI-generated.
AI Likelihood Score: 68%

Test #2

Truthscan: Correctly classified text as AI-generated.
AI Likelihood Score: 97%

Decopy AI: Correctly classified text as AI-generated.
AI Likelihood Score: 60%

Test #3

Truthscan: Correctly classified text as AI-generated.
AI Likelihood Score: 92%

Decopy AI: Correctly classified text as AI-generated.
AI Likelihood Score: 82%

Test #4

Truthscan: Correctly classified text as AI-generated.
AI Likelihood Score: 93%

Decopy AI: Correctly classified text as AI-generated.
AI Likelihood Score: 65%

Test #5

Truthscan: Correctly classified text as AI-generated.
AI Likelihood Score: 93%

Decopy AI: Correctly classified text as AI-generated.
AI Likelihood Score: 83%

Test #6

Truthscan: Correctly classified text as AI-generated.
AI Likelihood Score: 98%

Decopy AI: Correctly classified text as AI-generated.AI Likelihood Score: 73%

Test #7

Truthscan: Correctly classified text as AI-generated.
AI Likelihood Score: 90%

Decopy AI: Correctly classified text as AI-generated.
AI Likelihood Score: 60%

Average Score

The Bottom Line

TruthScan and Decopy AI may look like they’re solving the same problem, but the testing results tell a very different story.

Decopy AI is fine if you’re after a quick, lightweight check. But with a correctness rate of 70.14%, it’s clear that it struggles to keep pace with more advanced writing models. It’s a tool that works in a pinch, but not one you’d want to rely on consistently.

TruthScan, on the other hand, landed a correctness rate of 94.28%. That kind of performance isn’t just respectable — it’s industry-leading. Combined with its broader detection suite and enterprise-ready features, TruthScan proves it isn’t just another detector. It’s the detector you’d bet on when accuracy actually matters.

At the end of the day, Decopy AI feels like a tool for today’s essays and blog posts. TruthScan isn’t just more accurate, it also feels like a system built for everything else — the kind of platform that can handle the AI-generated curveballs we haven’t even seen yet.