Infection vs Mutant

Infection7.4Visit MMutant6.7Visit

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

vs

M Mutant #8 in Mutation Testing Tools 6.7/10 Free plan · paid from $30/mo Free plan✓ 3 of 4 features Visit Mutant

• Infection fits best

  PHP teams with CI quality gates

• Mutant fits best

  Ruby teams with Rails applications

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Side by side

Feature	Infection 7.4/10 Visit ↗	MMutant 6.7/10 Visit ↗
At a glance
Editor score	7.4	6.7
Ranking	#4 in Mutation Testing Tools	#8 in Mutation Testing Tools
Best for	PHP teams with CI quality gates	Ruby teams with Rails applications
Pricing model	Free	Free plan + paid
Starting price	Not published	$30/mo
Free plan	✓	✓
Free trial	—	—
Deployment	Self-hosted	Self-hosted
Support	Community, Docs	Email, Community, Docs
Integrations	6 integrations	5 integrations
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features Infection 4/4 · Mutant 3/4
Incremental analysis	✓	✓
Parallel execution	✓	✓
Surviving mutant reports	✓	✓
Mutation quality gate	✓ (best)	Not published
Specs
Supported languages	PHP	Ruby
Test frameworks	PHPUnit, PhpSpec, Codeception, Testo	RSpec, Minitest, Test::Unit
Mutation operators	Arithmetic, boolean, cast, conditional boundary, conditional negotiation, equality, function signature, nullify, number, operator, regex, removal, return value, visibility, and unwrap mutators	Arithmetic, logical, bitwise, statement removal, return-value modification, ordering
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	Supports RSpec, Minitest, Test::Unit, Rails, and SimpleCov Incremental analysis and parallel workers help target larger test suites Reports surviving mutants with session history and report recall
Cons	Supports PHP rather than multiple programming languages No AI features are included Mutation analysis is centered on supported PHP test frameworks	Commercial access starts at $30 per developer per month Supports Ruby rather than multiple programming languages Runs on Linux and macOS only
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 →	Mutant is a mutation-testing tool for Ruby applications and libraries. It modifies Ruby source code, runs selected tests, and reports mutations that survive. The product is aimed at Ruby teams that want to assess whether their test suites… 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

• Mutant — where it wins

  • Supports RSpec, Minitest, Test::Unit, Rails, and SimpleCov
  • Incremental analysis and parallel workers help target larger test suites
  • Reports surviving mutants with session history and report recall

  Where it doesn't

  • Commercial access starts at $30 per developer per month
  • Supports Ruby rather than multiple programming languages
  • Runs on Linux and macOS only

• Infection7.4/10 · Free plan

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

  Visit InfectionFull verdict →
• MMutant6.7/10 · Free plan · paid from $30/mo

  A focused Ruby mutation-testing tool with strong Rails and test-framework coverage.

  Visit MutantFull verdict →