Infection vs Mutatest

Infection7.4Visit MMutatest6.8Visit

Higher score Infection #4 in Mutation Testing Tools 7.4/10 Free plan Free plan✓ 4 of 4 features Visit Infection

vs

M Mutatest #7 in Mutation Testing Tools 6.8/10 Free plan Free plan✓ 3 of 4 features Visit Mutatest

• Infection fits best

  PHP teams with CI quality gates

• Mutatest fits best

  Python projects using pytest and coverage

Advertiser disclosure: iTechGuides is reader-supported. We may earn a commission when you click some links. How we rank.

Side by side

Feature	Infection 7.4/10 Visit ↗	MMutatest 6.8/10 Visit ↗
At a glance
Editor score	7.4	6.8
Ranking	#4 in Mutation Testing Tools	#7 in Mutation Testing Tools
Best for	PHP teams with CI quality gates	Python projects using pytest and coverage
Pricing model	Free	Free
Starting price	Not published	Not published
Free plan	✓	✓
Free trial	—	—
Deployment	Self-hosted	Self-hosted
Support	Community, Docs	Docs, Community
Integrations	6 integrations	2 integrations
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features Infection 4/4 · Mutatest 3/4
Incremental analysis	✓ (best)	Not published
Parallel execution	✓	✓
Surviving mutant reports	✓	✓
Mutation quality gate	✓	✓
Specs
Supported languages	PHP	Python
Test frameworks	PHPUnit, PhpSpec, Codeception, Testo	pytest
Mutation operators	Arithmetic, boolean, cast, conditional boundary, conditional negotiation, equality, function signature, nullify, number, operator, regex, removal, return value, visibility, and unwrap mutators	AugAssign; BinOp; bitwise comparison; bitwise shift; BoolOp; Compare; Compare In; Compare Is; If; Index; NameConstant; Slice
Our review
Pros	Broad PHP mutators with configurable profiles and custom mutators Parallel execution, coverage reuse, and changed-line filtering CI thresholds with HTML, text, JSON, GitHub, and GitLab reports	AST mutations run without modifying source files Coverage-guided selection, sampling, and multiprocessing support CI survivor thresholds and configurable mutation categories
Cons	Supports PHP rather than multiple programming languages No AI features are included Mutation analysis is centered on supported PHP test frameworks	Focused on Python projects and the pytest test framework Documented runtime support centers on Python 3.7 and 3.8 Command-line diagnostic scope may not suit broader testing stacks
Our verdict	Infection is an open-source mutation testing framework for PHP teams that want to measure whether their tests detect code changes. It uses AST-based source-code mutation, runs relevant test cases, and reports killed, escaped, errored, and… Read the review →	Mutatest is an open-source command-line tool for Python mutation testing. It is designed primarily for projects using pytest and coverage, helping teams evaluate whether their test suites detect changes in program behavior. The tool… Read the review →

Strengths and trade-offs

• Infection — where it wins

  • Broad PHP mutators with configurable profiles and custom mutators
  • Parallel execution, coverage reuse, and changed-line filtering
  • CI thresholds with HTML, text, JSON, GitHub, and GitLab reports

  Where it doesn't

  • Supports PHP rather than multiple programming languages
  • No AI features are included
  • Mutation analysis is centered on supported PHP test frameworks

• Mutatest — where it wins

  • AST mutations run without modifying source files
  • Coverage-guided selection, sampling, and multiprocessing support
  • CI survivor thresholds and configurable mutation categories

  Where it doesn't

  • Focused on Python projects and the pytest test framework
  • Documented runtime support centers on Python 3.7 and 3.8
  • Command-line diagnostic scope may not suit broader testing stacks

• Infection7.4/10 · Free plan

  A free, open-source PHP mutation testing framework with CI quality gates.

  Visit InfectionFull verdict →
• MMutatest6.8/10 · Free plan

  A focused mutation testing tool for Python projects built around pytest and coverage.

  Visit MutatestFull verdict →