DupliChecker vs Noplag
DupliChecker
duplichecker.com
Noplag
noplag.comSide by side
| Figure | DupliChecker | Noplag |
|---|---|---|
| Price from | $9.99/mo | $9.99/mo |
| Free plan | — | Yes |
| Free trial | — | Yes |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 3 | 4 |
| Spec score · Plagiarism Checkers | 7.7 (#16) | 9.2 (#3) |
| Spec score · AI Plagiarism Checkers | 7.7 (#14) | 9.2 (#3) |
| Spec score · Plagiarism Detection Software | 7.7 (#18) | 9.1 (#4) |
| Audience | The about page describes the service as online SEO and text analysis tools intended to make SEO and content marketing tools accessible worldwide. | The pricing page positions Pro for makers and small teams, Premium for agencies and publishers, and Enterprise for universities and regulated organizations. |
| Founded | 2006 | 2014 |
Plans
In their own words
DupliChecker
DupliChecker has no write-up on Specifiction yet; its figures are above.
Noplag
Noplag is an open-source plagiarism checker with a hosted cloud service and an engine released under Apache 2.0. Its current matching uses winnowing fingerprints and live-web comparison to find verbatim and near-verbatim copying; it does not detect paraphrase. Sources include the open web, Common Crawl, Wikipedia, academic indexes, the Noplag Database and users’ own folders. Submit DOCX, PDF, TXT, ODT or RTF files, paste text or provide a URL. Reports link matches to their sources, display similarity scores and exact overlapping text, and can be exported as PDFs. Detection is calibrated at launch for English, Spanish, Portuguese, Polish and Ukrainian. AI-content detection is marked as coming soon and intended as a separate signal. The free plan allows three checks per month, up to 2,500 words per check, with community Discord support. Pro costs $9.99 a month and includes 50 monthly checks, up to 25,000 words per check, database and academic-index matching, REST API and webhooks, and email support. A 14-day trial is listed.