Side by side
JPlag vs MOSS
Both stand on 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 APILinuxSelf-hosted
Choose JPlag if you need local pairwise analysis of program submissions, especially for student exercises or duplicated code. Look elsewhere if you need web matching, or if your environment cannot run Java SE 25.
Visit JPlag Free plan LinuxWeb
MOSS can surface similar passages across programming submissions, but it does not determine whether plagiarism occurred. Consider its submission limit, non-commercial restriction, and result-link accessibility before sending code.
Visit MOSSThe facts
| JPlag | MOSS | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Linux, Self-hosted | Linux, Web |
| Lowest paid plan | Free or on request | Free or on request |
| Plans published | 1 | 1 |
| Maker | Not published | Not published |
| Website | jplag.ipd.kit.edu | theory.stanford.edu |
| On plagiarism checkers | #5 of 31 | #9 of 31 |
JPlag: what it does well
- Free, open-source software.
- Analyzes program syntax and structure.
- Runs locally; code and results stay off external services.
- Supports many programming languages and multi-language input.
- Can ignore matches in shared starter code.
What to know first
- Requires Java SE 25 to run or build.
- Does not compare submissions with the internet.
- The default report list is limited to 2500 comparison pairs.
MOSS: what it does well
- Highlights matching code passages in HTML results
- Can exclude expected shared code
- Analyzes 24 programming languages
- Free for non-commercial use
What to know first
- Limited to 100 submissions per day per user
- Requires human review to assess similarity
- Results are accessible to anyone with the result URL
- Results are typically deleted after 14 days