Plagius vs SmallSEOTools Plagiarism Checker

Plagius Desktop analyzes academic papers and other documents for possible plagiarism, checking the internet or local files. It supports Word, PDF, OpenOffice, PPT, HTML, RTF, and plain-text formats. Reports can identify suspicious phrases and sources, display URLs with similarity percentages, estimate suspected-plagiarism percentages, and show analysis-quality indicators; results can be opened in a browser or exported as HTML. Its V5 AI detector analyzes paragraphs in context and returns an AI-generation probability and confidence level. The site says it recognizes signals from more than 15 models, including Gemini 3.7, GPT 5.6, and Claude 5. Professional desktop plans add local and network-share searches, batch analysis, direct URL analysis, and file comparisons. The maker says desktop analysis is performed locally, but external searches may send text fragments, usually 7 to 13 words, to search engines. AI detection may send isolated paragraphs to Plagius servers, where excerpts are deleted within up to 48 hours. A free demo runs analysis but reveals only some results. Plagius One is browser-based and initially limited to invited users. Plagius Basic costs $6.90, paid once; its license lasts 30 days and is for one Windows computer. The maker cautions that automated results need manual review and cannot alone confirm plagiarism.

SmallSEOTools Plagiarism Checker compares submitted text with online sources and returns a report identifying matches. Users can paste text, upload files from local or cloud storage, or check a URL. Upload formats include.doc,.docx,.txt,.tex,.rtf,.odt, and.pdf. Reports show duplication scores, exact and partial matches, flagged sentences, and source URLs. Quotations, references, and other properly attributed material can be excluded from the similarity score. The checker says it detects paraphrased content and synonym replacements as well as exact matches, and supports checks in more than 25 languages. Reports can be downloaded in PDF or Word format. The free plan allows up to 1,000 words per scan; paid plans start at $9.80/mo. An API is documented for plagiarism checks and account status, and a WordPress plugin checks content from the dashboard after an API is added in its settings. The product page says submissions are processed through a secure connection and remain confidential after analysis.