Plagium AI Detector

Plagium AI Detector is an AI checker tool. Plagium AI Detector scores pasted or uploaded text for the likelihood that a machine wrote it, highlighting suspect passages section by section. Two free searches a day need no account, and paid options range from $2 per document to monthly unlimited plans and institutional credit packages.

Plagium AI Detector is a browser based checker that estimates how likely a piece of text is to have been produced by a large language model such as ChatGPT or Gemini. The workflow is deliberately plain: paste a block of text or upload a document, run the analysis, and read a likelihood score with a short plain language verdict underneath. The tool frames its output as a probability rather than an accusation, which matters for anyone who plans to act on the result. The useful part for mixed documents is section level highlighting. Rather than returning one number for an entire submission, the detector marks the passages that read as machine written so a reviewer can see where the suspicion sits. That makes the product practical for teachers marking essays, editors screening pitches and manuscripts, and companies auditing the copy they are about to publish. Plagium also sells a separate plagiarism checker that searches the live web, news archives and academic repositories, so originality screening and AI screening can be run together on the same document. Getting started costs nothing and requires no account. Visitors get two free searches per day, each capped at 2,000 characters. Beyond that the model is pay as you go: a single document up to 5 pages for $2 with both plagiarism and AI detection included, or credit packages at $7.95 for 25 credits where one credit covers a page of 2,500 characters and credits never expire. An unlimited plan starts at $11.98 per month billed as $71.88 for six months, allowing up to 500 checks per calendar month on texts up to 5,000 characters. Institutions pay $1,200 per year and up for 6,000 shared credits, unlimited members and LMS integration. Against dedicated AI detectors, Plagium's appeal is that detection sits inside a wider originality toolkit rather than standing alone, and its per document pricing is easy to justify for occasional checks. The trade off is scale: short free character limits and monthly check caps make it a poor fit for high volume screening unless an institution buys in.