PlagiarismSearch vs Proofademic

PlagiarismSearch checks submitted writing against selected web, archived, publication, academic, and enabled organizational sources. Its reports identify matching or similar passages, link those passages to detected sources, and provide a similarity report. An AI writing feature gives probability indicators for the full text and individual passages, highlighting passages for review. The service also lists paper analysis, readability, and spelling and grammar tools. Users can check up to 150 words for free, while registered users can check up to 300 words daily at no charge. The maker says its academic database contains over 500 million indexed texts. Integrations include a Moodle plugin, Google Docs add-on, customizable API, and Viber and Telegram bots. The maker presents it for students, educators, writers, bloggers, universities, and organizations. Paid options include a Light one-time package at $9.95, paid once and monthly packages from $27.95 a month. The maker says uploaded documents are not stored, though reports may remain in an account until deleted by the user.

Proofademic analyzes submitted writing for AI-generated content and plagiarism, producing an overall score and sentence-by-sentence breakdown. Its listed checks include AI text, ChatGPT, paraphrase, multilingual and plagiarism detection, as well as Batch Scan. Proofademic says it reviews essays, research papers, articles and reports in 23 languages, with model coverage including ChatGPT, GPT-5, Claude and Gemini. Batch Scan lets teams upload documents, sort results by risk, inspect sentence-level evidence and export reports. Developers and platforms can use the AI Image Detector API; a browser-based image detector for individual users is described as coming soon. Proofademic says submitted text is processed automatically, is not used for model training or resale, and is not reviewed by people. It reports a 0.2% document false-positive rate in an evaluation of 4,200 fully human-authored academic texts, while advising that results support human review. The Free plan is free and includes 1,000 words and a 3-day trial. Paid plans are $15 a month for Essential, $25 a month for Premium and $45 a month for Professional.