Dolos

Web · Windows · Linux · Self-hosted · API

Freedom report

Two barsScore 5.3

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely3 of 6 device platforms
DocumentedThinly documented

Dolos is ranked #14 of 31 in plagiarism checkers on Freedom251. It runs on API, Linux, Self-hosted, Web, Windows. There is a free plan.

Dolos plans and pricing

All plans

Dolos web app Free Free to use · ZIP uploads limited to 10 MB dolos.ugent.be · 4 Oct 2026

Compared on plagiarism checkers

Free plan: Yes
Web source matching: No
Academic source matching: No
Report export formats: CSV
API access: Yes

Best Dolos alternatives

See all 20

Two bars Noplag Free tier No. 1$9.99/mo6.7 One bar Originality.ai Free tier No. 2$12.95/mo6.4 One bar PlagAware Free tier No. 3€2.99/mo6.4 One bar Plagiarisma Free tier No. 4Free6.4 One bar Quetext AI Detector Free tier No. 5$7.99/mo6.4 One bar SmallSEOTools Plagiarism Checker Free tier No. 6$7.84/mo6.4

The record

Purpose: Dolos detects plagiarism by finding similarities between source code submissions.
Analysis: Its pipeline tokenizes source files, fingerprints token sequences, indexes matches, and generates reports.
Reports: Reports include similarity, total overlap, and the longest matching fragment for file pairs.
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.
Usage: The web app accepts a ZIP of source files and automatically detects languages from file extensions, analyzing only the dominant language in mixed-language ZIPs unless a language is selected.
Integrations: Dolos provides a JSON API for automated integration with exercise platforms such as Dodona.
API limit: The public API limits ZIP submissions to 10 MB and recommends the CLI or library for larger submissions.
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.
Hosting: The free web app is hosted on Ghent University servers in Belgium, and users can also run Dolos locally or host their own server.
Open source: Dolos is open source under the MIT license.
Offline use: The command-line tool can run analyses locally and display results in a browser; a Docker image is also provided.
Support: General questions and support are handled through GitHub discussions, while bug reports, feature requests, and language requests can be filed as GitHub issues.
Audience: Dolos focuses on teachers checking programming tests and exams, as well as exercises where collaboration is allowed within small groups.
Headquarters: Ghent, Belgium
Price from: Free

Where it ranks on Freedom251

Best Plagiarism Checkers in 2026#14 of 31
Best Plagiarism Detection Software in 2026#17 of 28

Is Dolos yours?

Claim it for free: prove the domain, then correct facts, plans and screenshots. An editor reviews every change.

Claim it free Promote Dolos

Sources

dolos.ugent.be/docs/· checked 4 Oct 2026
dolos.ugent.be/about/algorithm.html· checked 4 Oct 2026
dolos.ugent.be/about/languages.html· checked 4 Oct 2026
dolos.ugent.be/docs/server.html· checked 4 Oct 2026
dolos.ugent.be/docs/api.html· checked 4 Oct 2026
dolos.ugent.be/docs/installation.html· checked 4 Oct 2026
dolos.ugent.be/about/contact.html· checked 4 Oct 2026
dolos.ugent.be· checked 28 Sept 2026