Side by side
Check-Plagiarism vs Noplag
Both stand on ai plagiarism checkers. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan AndroidAPIWeb
Check-Plagiarism combines file and pasted-text checks with match reports and API access. Before choosing a plan or workflow, note its stated file-limit discrepancy and the 7,000-word document maximum.
Visit Check-Plagiarism
Free plan Open source APILinuxMac+3
Noplag provides source-linked matching reports for verbatim and near-verbatim copying, with multiple submission formats and a free tier. Its stated inability to detect paraphrase is important to consider when choosing a checker.
Visit NoplagThe facts
| Check-Plagiarism | Noplag | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Yes |
| Runs on | Android, API, Web | API, Linux, Mac, Self-hosted, Web, Windows |
| Lowest paid plan | See the plans | Pro: $9.99 a month |
| Plans published | 10 | 4 |
| Maker | Not published | Not published |
| Website | check-plagiarism.com | noplag.com |
| On ai plagiarism checkers | #2 of 26 | #1 of 26 |
Check-Plagiarism: what it does well
- Accepts text and DOC, DOCX, TXT, or PDF files.
- Reports sentence-level matches, sources, and similarity percentages.
- Reports can be downloaded or shared.
- Offers an API with matching sentences and URLs.
What to know first
- Free searches are limited.
- File limits differ between the feature description and homepage.
- Maximum document length is 7,000 words.
Noplag: what it does well
- Checks files, pasted text or URLs
- Reports link matches to sources and show overlapping text
- PDF report export is available
- Free plan includes three checks per month
- Pro includes REST API and webhooks
What to know first
- Current engine does not detect paraphrase
- Free plan allows up to 2,500 words per check
- AI-content detection is coming soon
- Formal security attestations such as SOC 2 are not yet held
Alternatives to Check-Plagiarism Alternatives to Noplag The whole list