Dolos vs PrePostSEO Plagiarism Checker
Dolos
dolos.ugent.be
PrePostSEO Plagiarism Checker
prepostseo.comSide by side
| Figure | Dolos | PrePostSEO Plagiarism Checker |
|---|---|---|
| Price from | Free | $0.63/mo |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | Yes | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | — |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 2 | 8 |
| Spec score · Plagiarism Checkers | 9.0 (#5) | 7.6 (#21) |
| Audience | Dolos focuses on teachers checking programming tests and exams, as well as exercises where collaboration is allowed within small groups. | The maker describes the checker as suitable for students, teachers, researchers, content writers, and bloggers. |
| Integrations | Dolos provides a JSON API for automated integration with exercise platforms such as Dodona. | The maker says its plagiarism-checker API can be integrated with a website or online platform, and it lists a WordPress plugin in its services. |
| Languages | Dolos uses Tree-sitter parsers and supports common languages including Bash, C, C++, C#, Elm, JavaScript, Java, PHP, Python, and TypeScript out of the box. | The checker supports multiple languages, with French, Dutch, and Spanish given as examples. |
| Privacy | Team Dodona says it never shares submitted files or analysis reports and never uses them for commercial purposes; users can delete their data, and older data is periodically deleted. | The privacy policy says plagiarism-checking text and files are not saved or shared with third parties and are removed after processing. |
| Purpose | Dolos detects plagiarism by finding similarities between source code submissions. | The checker detects copied or duplicate content and reports the plagiarism percentage and matched sources. |
| Reports | Reports include similarity, total overlap, and the longest matching fragment for file pairs. | The checker provides plagiarism and unique-content percentages, matched-source URLs, and downloadable HTML or PDF reports. |
| Support | General questions and support are handled through GitHub discussions, while bugs and feature requests use GitHub issues. | The pricing page includes 24/7 support with its paid plan tiers. |
Plans
PrePostSEO Plagiarism Checker
- Monthly (plagiarism checker)$7 a month
- Basic (plagiarism checker)$7.50 a year
- Basic (all-in-one, annual billing)$50 a year
- Yearly (plagiarism checker)$63 a year
- Standard (plagiarism checker)$100 a year
- Standard (all-in-one, annual billing)$150 a year
- Business (plagiarism checker)$183.60 a year
- Company (all-in-one, annual billing)$350 a year
In their own words
Dolos
Dolos is a free, open-source tool for finding similarities between source-code submissions, particularly for teachers reviewing tests, exams, and exercises where collaboration may be allowed in small groups. Its analysis process tokenizes files, fingerprints token sequences, indexes matches, and produces reports. For each file pair, reports include similarity, total overlap, and the longest matching fragment. Dolos uses Tree-sitter parsers and supports languages including Bash, C, C++, C#, Elm, JavaScript, Java, PHP, Python, and TypeScript. The web app accepts ZIP files and detects languages from file extensions; in mixed-language archives, it analyzes only the dominant language unless a language is selected. Its public API accepts ZIP submissions up to 10 MB, with the CLI or library recommended for larger submissions. Analyses can also run locally, with results displayed in a browser, or on a self-hosted server. The free web app is hosted on Ghent University servers in Belgium. Dolos provides a JSON API for integrations such as Dodona and lists CSV as a report export format.
PrePostSEO Plagiarism Checker
PrePostSEO Plagiarism Checker examines submitted writing for copied or duplicate content and reports plagiarism and unique-content percentages, along with URLs for matched sources. It compares text with online sources using different search engines and says it can identify incremental, patchwork, and accidental plagiarism. Users can paste text or upload.doc,.docx,.pdf, and.txt files, then download reports in HTML or PDF. The checker supports multiple languages, with French, Dutch, and Spanish among the examples. Results link to paraphrasing, sentence rewriting, and citation-generation tools. The maker offers API integration for websites or online platforms and lists a WordPress plugin. Android and iOS apps and Windows and Mac applications are listed. Visitors and registered basic users can check a limited amount for free; the maker describes free users as receiving 500 search queries per month. Paid checker plans start at $5.25 per month when billed annually. The privacy policy says submitted text and files are removed after processing and are not saved or shared with third parties.