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Top 8 Ruby Code Quality Projects
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SimpleCov
Code coverage for Ruby with a powerful configuration library and automatic merging of coverage across test suites
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Sevalla
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Shopify would benefit a ton from "some" namespaces. In a way, packwerk[0] was an attempt at bringing some namespaces benefits.
But I don't personally think Shopify would benefit from this specific implementation of namespaces (a couple colleagues do). I'm personally not even sure Namespace is a proper term to describe that feature. It's more some sort of lightweight sandboxing to me.
Also:
> They have so many expert Ruby devs
If anything, the average Ruby expertise at Shopify is likely noticeably lower than in most Ruby/Rails shop.
[0] https://github.com/Shopify/packwerk
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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
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skunk
A SkunkScore Calculator for Ruby Code -- Find the most complicated code without test coverage! (by fastruby)
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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rails_lens
Comprehensive Rails application visualization and annotation tool - precision optics for the Rails universe
Project mention: Rails Lens – Model annotations and ERDs that eliminate AI hallucinations | news.ycombinator.com | 2025-08-04
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Ruby Code Quality discussion
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A note from our sponsor - SaaSHub
www.saashub.com | 1 Sep 2025
Index
What are some of the best open-source Code Quality projects in Ruby? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | SimpleCov | 4,846 |
| 2 | packwerk | 1,751 |
| 3 | suture | 1,411 |
| 4 | undercover | 812 |
| 5 | MetricFu | 624 |
| 6 | skunk | 531 |
| 7 | spellcheck-action | 42 |
| 8 | rails_lens | 42 |
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