Plagiarism Detector

Overview

Plagiarism Detector is document-checking software for plagiarism and AI-generated text, with a Windows app and an online checker. It is best suited to students, educators, and professionals who need to compare work against both public sources and local document collections. Its mix of search options and exportable reports is useful, though the demo’s strict limits make it a narrow way to assess the product.

Key features

Several routes to a match

The desktop app can check against the internet, the SciPap scientific papers database, an organization’s PDAS index, local folders, or pairs of documents. Global web checks use Google, Bing, and Yahoo and cover more than 4 billion sources. That breadth helps when a public web search alone would miss relevant academic or internal material; users who only need a basic web comparison may find the additional sources unnecessary.

AI detection and character substitution

The product also checks for AI-generated text. Its online checker supports 40 languages, making it a more relevant option for multilingual work than a checker limited to a small set of languages. A Unicode Anti-Cheating Engine catches character substitutions that use visually similar symbols, a useful safeguard when assessing text designed to evade ordinary matching.

Reports and document handling

Originality reports can be exported as PDF, CSV, or HTML and include a chart of detected portions. Those formats support different review workflows, from a shareable PDF to data that can be handled in a spreadsheet. The maker says desktop documents are processed on the user’s PC and only short search phrases leave the app during web checks, which may suit users handling sensitive work.

Local-network checks

PDAS is an on-premise server that indexes an organization’s documents for local-network checks and can work without an outside internet connection. This gives schools and businesses a way to compare submissions against their own collections. PDAS connectivity is included with Personal, Pro, and Portable licenses, but is unavailable in the demo and Lite, so the free version cannot establish whether that workflow suits an organization.

Pricing

Plagiarism Detector uses a freemium model. Its free demo costs nothing and allows 10 checks total, with up to 700 words per document and one document per session. It returns partial URLs, marks output with a Demo note, and processes resources incompletely. Those restrictions make it suitable for a brief look at the workflow, not regular checking or a fair evaluation of full reports.

Lite, Personal, Pro, and Portable are each one-time purchases with custom pricing and no subscription fees stated. Each allows 100 documents per month. Lite includes full document analysis but no PDAS connectivity or PDF report export. Personal adds PDAS connectivity. Pro includes PDAS connectivity and PDF report export. Portable includes both and can run from a USB drive. Personal is the fit for organizations that need local matching; Pro adds PDF output, while Portable adds the option to run from removable storage. Lite is the lower-scope choice for full document analysis without PDAS or PDF export. The plans’ 100-document monthly allowance remains a limit even though payment is one-time.

Platforms

The product is available on the web and Windows. The desktop app requires 64-bit Windows 10 or 11, with Windows 8 and 7 also supported. Portable can run from a USB drive. Free email support is offered, and expert support can assist remotely using TeamViewer.

Who it's for

Students and teachers can use the web and academic matching to review written work, while professionals can combine plagiarism checks with AI detection and report exports. Schools and businesses with internal document collections have the clearest reason to consider PDAS and an organization license with business-use allowance. Someone who only needs occasional checking must weigh that broader coverage against the demo’s 10-check total and the paid plans’ 100-document monthly cap.

Pros and cons

• Pros: Checks span public web, scientific papers, local files, document pairs, and an organization’s PDAS collection, covering more workflows than public-web matching alone.
• Pros: AI detection, 40-language online checking, and Unicode substitution detection add useful scrutiny beyond similarity matching.
• Pros: PDF, CSV, and HTML exports provide practical options for sharing or processing reports.
• Cons: The demo’s 700-word, one-document-per-session, 10-check limits and partial results restrict evaluation and ongoing free use.
• Cons: Paid plans allow 100 documents per month, and their prices are custom, making costs harder to compare before choosing.
• Cons: PDAS and PDF export are not available in Lite, so users who need those capabilities must choose a higher-scope license.

Alternatives

Consider Noplag if you want a broader range of platforms, including Linux, macOS, and self-hosted use; its free plan allows 3 checks per month, up to 2,500 words each, against the public web and Common Crawl. Choose Dolos for a free, MIT-licensed open-source option with a web app and ZIP uploads capped at 10 MB. Copyscape is a web and API alternative with free URL scans limited per website and to 10 results per search; its Copysentry Weekly protection plan costs $4.95 a month.

Crossref Similarity Check may fit organizations focused on document checking through its API or web service: the first 100 documents per year are free, with up to 25,000 words per document, and usage is invoiced annually in January for the previous year. For non-commercial code review, MOSS offers a free plan of 100 submissions per day per user on Linux and web. Originality.ai offers a free AI-detection-only plan with 3 scans per day and 2,000 words per scan, and can suit readers prioritizing that task. PlagAware has a free plan covering 10 pages per month and up to 30 monitored URLs, which may suit ongoing website-content monitoring. Plagiarism Checker X is a Windows alternative with a free basic plan and a one-time Professional license at $39.95, paid once.

Browse more options in Plagiarism Checkers.

Verdict

Plagiarism Detector is a strong fit for educators, professionals, and organizations that need several kinds of source matching alongside AI detection, especially when local document collections or offline PDAS checks matter. Its one-time licenses avoid subscription fees and Pro and Portable include PDAS connectivity and PDF exports. Look elsewhere if the demo’s narrow allowance is too limiting for evaluation, the monthly document ceiling is too low, or custom pricing makes the commitment difficult to assess.