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Head-to-head · Test Coverage Tools

Coveralls vs SimpleCov

  • Updated Sep 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Coveralls #2 in Test Coverage Tools 9.2/10 Free plan · paid from $10/mo · 30-day trial Free plan✓ 4 of 4 features Visit Coveralls
SimpleCov #7 in Test Coverage Tools 6.8/10 Free plan Free plan✓ 2 of 4 features Visit SimpleCov

Coveralls leads on 2 checks, SimpleCov on 0, and 3 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreCoveralls · 9.2/10
  • Free planboth
  • Most featuresCoveralls · 4 of 4

Coveralls scores higher on our rubric for test coverage tools: 9.2 against 6.8 out of 10; our editors rank them #2 and #7.

Coveralls offers pull-request annotations; SimpleCov doesn't publish it. Coveralls offers self-hosted option; SimpleCov doesn't publish it.

Coveralls is the better fit for mature multi-language coverage reporting. SimpleCov is the better fit for ruby teams needing advanced coverage gates.

  • Coveralls fits best

    Mature multi-language coverage reporting

  • SimpleCov fits best

    Ruby teams needing advanced coverage gates

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Side by side

Feature Coveralls 9.2/10 Visit ↗ SimpleCov 6.8/10 Visit ↗
At a glance
Editor score 9.2 6.8
Ranking #2 in Test Coverage Tools #7 in Test Coverage Tools
Best for Mature multi-language coverage reporting Ruby teams needing advanced coverage gates
Pricing model Free plan + paid Free
Starting price $10/mo Not published
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud, Desktop
Platforms Web Web, Windows, macOS, Linux
Support Email, Live chat, Community, Docs Docs, Community
Integrations 30+ integrations 4 integrations
Built for Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Coveralls 4/4 · SimpleCov 2/4
Pull-request annotations ✓ (best) Not published
Self-hosted option ✓ (best) Not published
Historical trends ✓ ✓
Coverage gates ✓ ✓
Specs
Coverage types line, branch line, branch, method, oneshot-line, eval
Supported languages .NET, C/C++, D, Elixir, Erlang, FORTRAN, Go, Haskell, Java, JavaScript, Julia, Kotlin, Lisp, Lua, OCaml, Objective-C, PHP, Python, R, Ruby, Scala, Smalltalk, Swift Ruby
Report formats LCOV, SimpleCov, Cobertura, JaCoCo, Gcov, LuaCov, Golang, Coveralls JSON, Pytest-Cov, Clover XML HTML, JSON
Our review
Pros
  • Repository, file, and line-level coverage statistics with history
  • Pull-request comments, thresholds, and commit status updates
  • Broad CI, language, notification, API, and self-hosted support
  • Supports line, branch, method, oneshot-line, and eval coverage
  • Merges coverage across test suites and parallel workers
  • Adds thresholds, ratchets, history, and patch coverage analysis
Cons
  • Private repositories require a paid plan
  • Language integrations are community-created unless otherwise noted
  • Higher tiers are needed for larger private-repository portfolios
  • Supports Ruby rather than multiple programming languages
  • Provides HTML and JSON report formatters
  • Is a library, not a vendor-hosted SaaS product
Our verdict

Coveralls is a web-based code coverage service for software teams and open-source projects. It receives coverage reports from continuous-integration workflows, stores build history, and presents repository, file, and line-level statistics.…

Read the review →

SimpleCov is an open-source code coverage analysis library for Ruby applications. It suits Ruby teams that need more than a basic line-coverage percentage, including projects using RSpec, Minitest, Rails, or Cucumber. The library uses…

Read the review →
  1. CoverallsTest Coverage Tools 9.2Free plan · paid from $10/mo · 30-day trial
  2. SimpleCovTest Coverage Tools 6.8Free plan

Strengths and trade-offs

  • Coveralls — where it wins

    • Repository, file, and line-level coverage statistics with history
    • Pull-request comments, thresholds, and commit status updates
    • Broad CI, language, notification, API, and self-hosted support

    Where it doesn't

    • Private repositories require a paid plan
    • Language integrations are community-created unless otherwise noted
    • Higher tiers are needed for larger private-repository portfolios

  • SimpleCov — where it wins

    • Supports line, branch, method, oneshot-line, and eval coverage
    • Merges coverage across test suites and parallel workers
    • Adds thresholds, ratchets, history, and patch coverage analysis

    Where it doesn't

    • Supports Ruby rather than multiple programming languages
    • Provides HTML and JSON report formatters
    • Is a library, not a vendor-hosted SaaS product
  • Coveralls9.2/10 · Free plan · paid from $10/mo · 30-day trial

    A mature coverage service for multi-language teams needing CI and pull-request visibility.

    Visit CoverallsFull verdict →
  • SimpleCov6.8/10 · Free plan

    A free Ruby coverage library with advanced gates, history, and change analysis.

    Visit SimpleCovFull verdict →

More comparisons

All test coverage tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

Last updated · How we research and update