Stryker Mutator vs Infection

Stryker Mutator7.7Visit Infection7.4Visit

Higher score Stryker Mutator #3 in Mutation Testing Tools 7.7/10 Free plan Free plan✓ 4 of 4 features Try Stryker Mutator

vs

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

• Stryker Mutator fits best

  Polyglot JavaScript, C#, and Scala teams

• Infection fits best

  PHP teams with CI quality gates

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Side by side

Feature	Stryker Mutator 7.7/10 Visit ↗	Infection 7.4/10 Visit ↗
At a glance
Editor score	7.7	7.4
Ranking	#3 in Mutation Testing Tools	#4 in Mutation Testing Tools
Best for	Polyglot JavaScript, C#, and Scala teams	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	Community, Docs	Community, Docs
Integrations	8 integrations	6 integrations
Built for	Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features Stryker Mutator 4/4 · Infection 4/4
Incremental analysis	✓	✓
Parallel execution	✓	✓
Surviving mutant reports	✓	✓
Mutation quality gate	✓	✓
Specs
Supported languages	JavaScript, TypeScript, C#, Scala	PHP
Test frameworks	Cucumber, Jasmine, Jest, Karma, Mocha, Tap, Vitest, command runner	PHPUnit, PhpSpec, Codeception, Testo
Mutation operators	Arithmetic Operator, Array Declaration, Block Statement, Boolean Literal, Conditional Expression, Equality Operator, Logical Operator, Method Expression, Object Literal, Optional Chaining, Regex, String Literal, Unary Operator, Update Operator	Arithmetic, boolean, cast, conditional boundary, conditional negotiation, equality, function signature, nullify, number, operator, regex, removal, return value, visibility, and unwrap mutators
Our review
Pros	Supports JavaScript, TypeScript, C#, and Scala Parallel and incremental testing can target changed code CI thresholds and HTML, JSON, and dashboard reporting	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	Language support is limited to JavaScript, TypeScript, C#, and Scala It is an open-source toolkit rather than a hosted commercial plan Teams must configure the appropriate runner and framework integrations	Supports PHP rather than multiple programming languages No AI features are included Mutation analysis is centered on supported PHP test frameworks
Our verdict	Stryker Mutator is an open-source mutation testing toolkit for teams that want to evaluate whether automated tests detect deliberate code changes. It supports JavaScript, TypeScript, C#, and Scala through separate frameworks, making it a… 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

• Stryker Mutator — where it wins

  • Supports JavaScript, TypeScript, C#, and Scala
  • Parallel and incremental testing can target changed code
  • CI thresholds and HTML, JSON, and dashboard reporting

  Where it doesn't

  • Language support is limited to JavaScript, TypeScript, C#, and Scala
  • It is an open-source toolkit rather than a hosted commercial plan
  • Teams must configure the appropriate runner and framework integrations

• 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

• Stryker Mutator7.7/10 · Free plan

  A broad, open-source mutation testing toolkit with strong CI and reporting support.

  Try Stryker MutatorFull verdict →
• Infection7.4/10 · Free plan

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

  Visit InfectionFull verdict →