PIT vs Infection

PIT8.2Visit Infection7.4Visit

Higher score PIT #2 in Mutation Testing Tools 8.2/10 Free plan Free plan✓ 4 of 4 features Visit PIT

vs

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

• PIT fits best

  Java teams wanting a mature free standard

• Infection fits best

  PHP teams with CI quality gates

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Side by side

Feature	PIT 8.2/10 Visit ↗	Infection 7.4/10 Visit ↗
At a glance
Editor score	8.2	7.4
Ranking	#2 in Mutation Testing Tools	#4 in Mutation Testing Tools
Best for	Java teams wanting a mature free standard	PHP teams with CI quality gates
Pricing model	Free	Free
Starting price	Not published	Not published
Free plan	✓	✓
Free trial	—	—
Deployment	Self-hosted	Self-hosted
Support	Docs, Community	Community, Docs
Integrations	10 integrations	6 integrations
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features PIT 4/4 · Infection 4/4
Incremental analysis	✓	✓
Parallel execution	✓	✓
Surviving mutant reports	✓	✓
Mutation quality gate	✓	✓
Specs
Supported languages	Java and JVM bytecode	PHP
Test frameworks	JUnit 3, JUnit 4, TestNG; JUnit 5 via plugin	PHPUnit, PhpSpec, Codeception, Testo
Mutation operators	Conditionals Boundary, Increments, Invert Negatives, Math, Negate Conditionals, Void Method Calls, Empty Returns, False Returns, True Returns, Null Returns, Primitive Returns, Remove Conditionals, Inline Constant, Constructor Calls, Non-Void Method Calls, Remove Increments, Argument Propagation, Big Integer, Member Variable, Naked Receiver, Negation, Arithmetic Operator Replacement, Arithmetic Operator Deletion, Constant Replacement, Bitwise Operator, Relational Operator Replacement, Unary Operator Insertion	Arithmetic, boolean, cast, conditional boundary, conditional negotiation, equality, function signature, nullify, number, operator, regex, removal, return value, visibility, and unwrap mutators
Our review
Pros	Parallel execution with configurable thread counts Broad mutation-operator selection and configurable thresholds HTML, XML, and CSV reports with mutant status details	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
Cons	Focused on Java and JVM bytecode projects JUnit 5 support requires a plugin Gradle and IDE integrations rely on third-party components	Supports PHP rather than multiple programming languages No AI features are included Mutation analysis is centered on supported PHP test frameworks
Our verdict	PIT is an open-source mutation testing system for Java and JVM projects. It modifies compiled Java bytecode, runs targeted unit tests against generated mutants, and reports whether mutations were killed, survived, lacked coverage, timed… Read the review →	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 →

Strengths and trade-offs

• PIT — where it wins

  • Parallel execution with configurable thread counts
  • Broad mutation-operator selection and configurable thresholds
  • HTML, XML, and CSV reports with mutant status details

  Where it doesn't

  • Focused on Java and JVM bytecode projects
  • JUnit 5 support requires a plugin
  • Gradle and IDE integrations rely on third-party components

• 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

• PIT8.2/10 · Free plan

  A mature open-source choice for Java teams that need configurable mutation analysis.

  Visit PITFull verdict →
• Infection7.4/10 · Free plan

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

  Visit InfectionFull verdict →