Overview

Plagium combines web-based similarity checks with a separate AI-writing detector, serving individual document checks as well as institutional and business workflows. It is best suited to people who want both kinds of screening and can treat the results as leads to investigate; it is a poor fit when a definitive judgment or broad access to non-public sources is essential.

Key features

Similarity reports identify matching passages and link to original sources, which gives editors, students and researchers a starting point for checking context. Coverage is web-only, however, so unpublished, private or non-indexed material may be missed. Reports are automated estimates, not proof of plagiarism.

The separate AI Detector uses statistical and probabilistic analysis of writing patterns. It can provide another screening signal, but should not be used alone to decide who wrote a text, particularly where academic or editorial consequences are involved.

Deep Search accepts Microsoft Word, PDF and text files. Google Drive integration and a Google Docs add-on bring checks into document workflows; institutions can use API access, while business solutions can connect with CRM, ERP and document-management platforms. Plagium publishes API v2 and v3 documentation. These options make the service more useful to organizations than a standalone checker, though the broader integrations are aimed at institutional and business use.

Business offerings describe encryption, access controls and auditing, with compliance support for corporate regulations. Plagium says it processes data under applicable laws such as the EU GDPR and Brazil's LGPD. Users retain ownership of submitted content, which Plagium processes for analysis, report generation and service improvement.

Pricing

The Free account costs 0.00 USD per free and allows five searches a day, with a 4,000-character limit per free search. It excludes Deep Search and API access, so it works for occasional short checks, not file-based or integrated workflows.

The Monthly plan has custom pricing. It includes 10 free daily searches, the same 4,000-character free-search limit, Deep Search, priority support, an originality certificate and volume discounts. It suits recurring users who need Deep Search or support, but the daily free-search allowance remains character-capped.

The Prepaid plan also has custom pricing and includes five free daily searches, a 4,000-character free-search limit, Deep Search, an originality certificate and volume discounts. It is a lower-allowance option for users who want Deep Search without the Monthly plan's stated priority support.

Institutions has custom pricing and includes plagiarism detection, Deep Search, the AI Detector, priority support, API access, sub accounts and volume discounts. It is the clearest fit for educational or organizational deployments that need managed access and integration; individual users do not get the same institutional toolkit through the free account.

Platforms

Plagium is available on Android, iOS and the web. Its Google Docs add-on and Google Drive integration also support document-based workflows.

Who it's for

Plagium presents its solutions for educational institutions, publishers and editors, companies, researchers and compliance teams. Individual writers can use the free account for short web checks, while institutions and businesses have the deeper search, API and integration options. Anyone making high-stakes decisions should treat both similarity and AI results as prompts for review rather than final evidence.

Pros and cons

Pro: Similarity reports link to original sources, helping users inspect matches rather than relying only on a score.
Pro: A distinct AI Detector complements similarity screening, and institutional plans include both.
Pro: Deep Search supports Word, PDF and text uploads, with Google document integrations and enterprise connections for broader workflows.
Con: Web-only source coverage can miss private, unpublished or non-indexed material.
Con: The free account caps searches at 4,000 characters and does not include Deep Search or API access.
Con: Automated reports are estimates, so they cannot settle authorship or plagiarism disputes on their own.

Alternatives

For a wider directory of options, compare AI Plagiarism Checkers or Plagiarism Detection Software.

Noplag is worth considering if Linux, macOS, Windows or self-hosted access matters; its free plan allows three monthly checks of up to 2,500 words against the public web and Common Crawl corpus.

PlagAware may suit users who want a free allowance of 10 pages a month and Content Protection Banner monitoring for up to 30 URLs.

Plagiarisma is a simpler alternative for Windows users seeking a free desktop plagiarism checker.

PrePostSEO Plagiarism Checker is an option for users seeking a broader tool across Android, iOS, macOS, Windows and the web, with a Basic annual plan priced at 4.17 USD per year.

Proofademic may appeal to users who want multilingual AI detection, plagiarism checking and report export, with a free 1,000-word, three-day trial.

SmallSEOTools Plagiarism Checker offers a free scan of up to 1,000 words and may be a better fit for short checks without Plagium's document workflow emphasis.

Check-Plagiarism is another web and Android option, with an annual plan priced at 8.33 USD per month.

Copyleaks AI Detector is an alternative for users seeking AI and plagiarism detection with stated support for more than 30 AI-detection languages.

Verdict

Choose Plagium if you need linked-source similarity checks alongside a separate AI-writing screen, especially when Google document tools, Deep Search or institutional integrations matter. Look elsewhere if you need comprehensive coverage beyond the public web or require automated results to serve as conclusive evidence.

	Plagium	Plagius
Free plan	Yes	No
Free trial	No	Yes
Paid from	Free	$4.90/mo
Open source	No	No
Platforms	Android, iOS, Web	macOS, Web, Windows
Free plan	Yes	No
LMS integrations	Yes	No
API access	Yes	No

Plagium vs Plagius

Plagium

Plagius