iThenticate vs Noplag
iThenticate
ithenticate.com
Noplag
noplag.comSide by side
| Figure | iThenticate | Noplag |
|---|---|---|
| Price from | — | $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 (#17) | 9.2 (#3) |
| Spec score · AI Plagiarism Checkers | 7.7 (#15) | 9.2 (#3) |
| Spec score · Plagiarism Detection Software | 7.7 (#19) | 9.1 (#4) |
| API | API access is available only for organizational accounts and requires contacting an iThenticate account sales representative. | The developer API is REST with an OpenAPI spec and webhooks, and is available on paid tiers. |
| Headquarters | Oakland, California | San Francisco, United States |
| Integrations | iThenticate supports Crossref Similarity Check and its search targets can include Crossref content. | The features page lists Canvas, Moodle, Blackboard, and Brightspace integrations via LTI 1.3. |
| Security | The service added multi-factor authentication by one-time passcode for iThenticate administrator sign-ins in September 2026. | Noplag says it encrypts data in transit and at rest and does not yet hold formal attestations such as SOC 2. |
| Support | iThenticate says its support team is available 24/7 and provides support by email at [email protected]. | Free includes community Discord support, Pro includes email support, and Premium includes priority support with a 12-hour response target. |
Plans
iThenticate
- Single$125, paid once
- Multiple$300, paid once
- OrganizationPriced on request
In their own words
iThenticate
iThenticate 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.