Mutant
6.7#3 in mutation testing toolsFrom $250 a yearFree planLinuxmacOS
VisitMutant vs pytest-gremlins
pytest-gremlins
6.1#9 in mutation testing toolsFree planFree planLinux
VisitWhat both publish
| Fact | Mutant | pytest-gremlins |
|---|---|---|
| Purpose | Mutant is mutation testing for Ruby that systematically modifies code and verifies that tests catch each change. | pytest-gremlins is a pytest plugin that injects small code mutations and checks whether tests catch them. |
Mutant plans
- Open sourceFree
- Commercial monthly$30 a month
- Commercial yearly$250 a year
- EnterprisePriced on request
pytest-gremlins plans
- pytest-gremlinsFree
Pick Mutant if…
Mutant suits Ruby developers who want to check whether their tests detect code changes, including teams using the listed test frameworks or supported Rails versions. Its open-source plan is for public repositories; commercial use requires a per-developer subscription.
Pick pytest-gremlins if…
pytest-gremlins is for Python developers who already use pytest and want to assess whether their tests catch changes in important code. The guide recommends focusing on business logic, security-critical code, and financial calculations.