Side by side
Mutode vs pytest-gremlins
Both stand on mutation testing tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Paid
Mutode adds mutation testing to JavaScript and Node.js projects, with configurable operators and runner concurrency. Its clean-test prerequisite and Node version requirement are important to check before using it.
Visit Mutode Free plan Linux
pytest-gremlins adds mutation testing to existing pytest suites, with reporting and CI options. Allow for a potentially much longer first run, and do not treat a 100% mutation score as a necessary target: equivalent mutations can make it unattainable.
Visit pytest-gremlinsThe facts
| Mutode | pytest-gremlins | |
|---|---|---|
| Free plan | Not published | Yes |
| Open source | Not published | Not published |
| Runs on | Not published | Linux |
| Lowest paid plan | Not published | Free or on request |
| Plans published | None | 1 |
| Maker | Not published | Not published |
| Website | thesoftwaredesignlab.github.io | github.com |
| On mutation testing tools | #25 of 25 | #21 of 25 |
Mutode: what it does well
- Free and open source under MIT.
- Reports killed, survived and discarded mutants.
- Users can choose mutation operators.
- Concurrency defaults to four runners.
- Supports global, local and npx execution.
What to know first
- Requires Node 8 or later.
- Runs the project’s npm test command first.
- Documentation does not list third-party integrations.
pytest-gremlins: what it does well
- Free, MIT-licensed package.
- Supports incremental analysis and parallel execution.
- Offers console, HTML, and JSON reports.
- GitHub Action can enforce a mutation-score threshold.
What to know first
- Requires Python 3.11 or later and pytest 7.0 or later.
- A first run may take 10–100 times as long as normal tests.
- Development status is classified as Alpha.
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