Scientist VS SimpleCov

Compare Scientist vs SimpleCov and see what are their differences.


:microscope: A Ruby library for carefully refactoring critical paths. (by github)


Code coverage for Ruby with a powerful configuration library and automatic merging of coverage across test suites (by simplecov-ruby)
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Scientist SimpleCov
18 11
7,320 4,703
0.2% 0.1%
2.5 6.5
20 days ago 22 days ago
Ruby Ruby
MIT License MIT License
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.


Posts with mentions or reviews of Scientist. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-12-05.


Posts with mentions or reviews of SimpleCov. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2024-02-02.
  • Must-have gems for mature Rails
    8 projects | | 2 Feb 2024
    gem "simplecov" - | Gather spec coverage stats locally and on CI, aim for those 90+%.
  • My First Code Commit in Ruby
    2 projects | | 29 Dec 2022
    My talk is about different best practices - specifically when adhering to them breaks down. One of those best practices is high test coverage. I start to work on the content for my presentation by building the code samples that I want to use in the slides. For the code coverage section, I'm writing some code with some tests. I'm using SimpleCov to generate code coverage results.
  • Improve Code in Your Ruby Application with RubyCritic
    7 projects | | 26 Oct 2022
    SimpleCov - a tool to check Ruby application code coverage. You can configure it to run alongside your tests. It provides metrics on code coverage so that you can identify what you need to pay attention to and where to invest your time to create better test cases.
  • Paying Down Technical Debt
    2 projects | | 1 Mar 2022
    Ensure that you have sufficient test coverage. You can use code coverage analysis tools like SimpleCov to gain insight into gaps in your coverage.
  • How to test all workers in one big loop?
    2 projects | /r/rails | 2 Dec 2021
    simplecov might the answer you need, it generates a report of the lines of code your test suite hits.
  • How to Improve Code Quality on a Ruby on Rails Application
    8 projects | | 11 Nov 2021
    Use SimpleCov to generate a report of how many statements are covered by your test suite. It won't assess the test suite quality, though.
  • Ruby's Got You Covered
    2 projects | | 21 Oct 2021
    There are many tools for measuring test coverage, but one is SimpleCov. It also supports branches coverage. To measure coverage of production code, check out Coverband, which you can set up to use oneshot lines mode.
  • Como configurar ambiente de testes em Ruby on Rails com RSpec
    7 projects | | 21 Apr 2021
  • Question about wrapping instance vars in attr_reader
    3 projects | /r/ruby | 16 Feb 2021
    Technically you could measure the usage with MethodCoverage. But that is future talk for simplecov. So in theory we could visualize unused instance variables

What are some alternatives?

When comparing Scientist and SimpleCov you can also consider the following projects:

Coverband - Ruby production code coverage collection and reporting (line of code usage)

Rubocop - A Ruby static code analyzer and formatter, based on the community Ruby style guide. [Moved to:]

Rubycritic - A Ruby code quality reporter

undercover - undercover warns about methods, classes and blocks that were changed without tests, to help you easily find untested code and reduce the number of bugs. It does so by analysing data from git diffs, code structure and SimpleCov coverage reports

Pronto - Quick automated code review of your changes

rails_best_practices - a code metric tool for rails projects

Pippi - pippi

MetricFu - A fist full of code metrics

Flog - Flog reports the most tortured code in an easy to read pain report. The higher the score, the more pain the code is in.

ruby - The Ruby Programming Language