Plagium

Plagium analyzes textual similarity and checks for writing patterns compatible with AI-generated content. Its plagiarism service compares submitted text with an online database and reports similarities with links to original sources. A separate AI Detector uses statistical and probabilistic analysis of writing patterns. Deep Search accepts Microsoft Word, PDF, and native text files, while Google Drive integration and a Google Docs add-on support document workflows. Institutional plans include API access, and business solutions can connect with corporate systems such as CRM, ERP, and document-management platforms. The free account provides five daily searches and a 4,000-character limit, but does not include Deep Search or API access. Plagium presents solutions for educational institutions, publishers, editors, companies, researchers, and compliance teams. Reports are automated estimates, not definitive proof; private, unpublished, or non-indexed material may not be detected. The company says users retain ownership of submitted content, which it processes for analysis, report generation, and service improvement.

Plagium offers similarity checking, a separate AI Detector, and document integrations. Treat its results as estimates, especially since private or non-indexed material may be missed.

Plagium may suit educators, publishers, editors, companies, researchers, and compliance teams checking submitted writing. Its free account may fit occasional checks within the daily and character limits.

Overview

Plagium combines web-based text similarity checks with a separate AI Detector, serving individual users as well as institutional and business workflows. It suits people who want both forms of screening in one service and can investigate results rather than treat them as verdicts. Its reach is limited to web sources, and its reports are estimates rather than proof.

Key features

Similarity reports show matches against an online database and link to original sources, giving students, editors and researchers a place to begin checking context. But the service covers web sources only: private, unpublished or non-indexed material may be missed, so it is a weak choice when the relevant comparison material is not public or indexed.

The separate AI Detector uses statistical and probabilistic analysis of writing patterns. That adds a different screening signal, but it cannot establish authorship. For decisions with academic or editorial consequences, its results should prompt further review, not stand alone as evidence.

Deep Search accepts Microsoft Word, PDF and text files. Google Drive integration and a Google Docs add-on suit document-based workflows; institutions can use API access, and business solutions can connect with CRM, ERP and document-management platforms. Plagium publishes API v2 and v3 documentation. Business offerings also describe encryption, access controls and auditing, while its privacy practices follow applicable laws such as the 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 nothing and allows five searches per day, with a 4,000-character limit per free search. It excludes Deep Search and API access, making it a sensible starting point for short, occasional checks, but not for file-based or integrated workflows.

The Monthly plan has custom pricing and includes 10 free daily searches, the same 4,000-character free-search limit, Deep Search, priority support, an originality certificate and volume discounts. It fits regular users who need file uploads and support, though the free-search cap still applies to those searches.

The Prepaid plan also has custom pricing. It includes five free daily searches, the 4,000-character free-search limit, Deep Search, an originality certificate and volume discounts. It offers Deep Search without the Monthly plan’s priority support or 10-search daily allowance.

Institutions has custom pricing and adds plagiarism detection, Deep Search, the AI Detector, priority support, API access, subaccounts and volume discounts. That makes it the clearest fit for teams managing multiple users or integrating checks into systems; individual users do not get API access through the Free account.

Platforms

Plagium is available on Android, iOS and the web. Google Drive and Google Docs integrations extend its document workflow, while LMS integration, API access and business-system connections support organizational use.

Who it's for

Plagium is aimed at educational institutions, publishers and editors, companies, researchers and compliance teams. Individuals can use the Free account for short checks, while teams can consider institutional or business workflows. It is not the right fit for anyone who needs comprehensive access to private or unpublished comparison material, or a definitive authorship judgment.

Pros and cons

• Pro: Similarity matches link to original sources, helping users investigate context instead of relying on a bare score.
• Pro: Separate AI screening, document uploads and Google integrations cover more than one checking workflow.
• Pro: Institutional API access and business-system integrations can suit organizations embedding checks in existing processes.
• Con: Web-only coverage can miss private, unpublished and non-indexed material.
• Con: Free searches are capped at 4,000 characters, and the Free account lacks Deep Search and API access.
• Con: Similarity and AI results are automated estimates, so they cannot settle consequential questions on their own.

Alternatives

DrillBit is worth considering for paid, one-time checks: its $5, paid once plan covers 25 pages, about 6,250 words, with similarity reporting, AI detection and grammar analysis.

GPTZero may suit readers focused on AI detection who want a free tier with 10,000 words per month and 50,000 characters, alongside a free trial.

Copyscape is another option for website-oriented checks: its free URL scans are limited per website and return at most 10 results per search.

Noplag offers a free plan with three checks per month, up to 2,500 words per check, against the public web and Common Crawl corpus.

Noplag Engine may appeal to readers who want self-hosting: its free plan includes three monthly checks of up to 2,500 words against the public web and Common Crawl, plus unlimited local checks when self-hosted.

Originality.ai offers a free AI-only option with three scans per day, up to 2,000 words per scan, and DOCX, PDF and DOC uploads.

Pangram is an alternative for readers who want a free AI-focused plan with 2,000 words per day, image scans, file upload and OCR, and a browser extension.

Quetext AI Detector offers a free tier that includes an AI detector and plagiarism checker, each up to 1,000 words, plus summarizing and humanizing tools up to 2,000 words.

Browse Plagiarism Detection Software or AI Plagiarism Checkers for more options.

Verdict

Plagium is a good fit for individuals who need occasional short similarity checks and for organizations that want document workflows, AI screening and integration options in one service. Its strongest case is the combination of source-linked similarity reports and institutional or business integrations. Look elsewhere if you need dependable coverage of private or non-indexed material, or a conclusive answer about authorship.