zerogpt is one of the most popular free ai detectors. no signup required. paste text, get a score. millions of people use it as a quick check.

like gptzero and copyleaks, zerogpt is a detection tool — the opposite of what paraai does. but people search for this comparison so let's address it.

how zerogpt works

zerogpt analyzes text patterns and gives a percentage score. it's straightforward — paste in, get a number. they also highlight sentences they believe are ai-generated.

for a free tool, it's decent. it catches raw chatgpt output reliably. the ui is simple and fast.

zerogpt's limitations

it's less accurate than paid detectors. the false positive rate is higher. human-written academic text gets flagged more often. the sentence-level highlighting is often wrong even when the overall score is roughly correct.

the free tier has usage limits. and like all detectors, it's a probabilistic guess, not a definitive measurement.

how paraai output scores on zerogpt

raw chatgpt on zerogpt: typically 85-100% ai detected.

paraai paraphrase output on zerogpt: typically 0-8% ai detected.

our fine-tuned models produce text that zerogpt classifies as human. the structural patterns match human writing because the models learned from human writing.

use them together

zerogpt is a solid free quality check. write with paraai. check with zerogpt. if the score is low, you're good. if it's not (rare), run the flagged sections through paraphrase again.

free detector plus quality rewriter is a practical workflow. untraceable ai writing verified by the tools people actually use. no reason to treat detectors as enemies when they can be quality control.