// AI detectors

Originality.ai

Credit-based AI and plagiarism checker aimed at web publishers.

official sources onlychecked 2026-10-26

⚠ AI detection can misjudge. Vendor claims are not independent evaluations; AI detection may misjudge.

01At a glance

Official link	https://originality.ai/ai-checker
Made by	Originality.ai
Free?	Free plan: 10K words one time (100 credits); 1 credit = 100 words.
Paid	$14.95/month, or $12.95/month billed yearly, for 200K words per month.
Languages	Check the official page.
Files	docx, doc, pdf upload, or paste text.
Limits	Credit-based (1 credit per 100 words).
Best for	Content agencies, publishers, SEO teams.

Official claim: “the Most Accurate AI Detector in third-party studies” (vendor statement).

Independent evaluations:

Weber-Wulff et al. (2023), “Testing of detection tools for AI-generated text”, International Journal for Educational Integrity — 14 tools tested (12 public + Turnitin and PlagiarismCheck): all scored below 80% accuracy and only 5 above 70%; the authors conclude the tools are “neither accurate nor reliable”. False positives ranged from 0% (Turnitin) to 50% (GPTZero) on their test set; machine paraphrasing cut accuracy to 26%. English texts, tested in 2023 – tools have changed since.
Liang et al. (2023), “GPT detectors are biased against non-native English writers”, Patterns — Several widely used GPT detectors “consistently misclassify non-native English writing samples as AI-generated, whereas native writing samples are accurately identified”; simple prompting can also bypass them. The authors caution against using detectors in evaluative or educational settings.

Is Originality.ai free?

There is a one-time free 10K words (100 credits); after that it is paid from $14.95/month.

Can Originality.ai be wrong?

Yes – AI detection can misjudge. Vendor claims are not independent evaluations; AI detection may misjudge.

Checked against these pages on 2026-10-26; the official page wins if anything differs.