Comparison

RuboCop vs SpotBugs

On the evidence we track, RuboCop leads this comparison with a composite score of 64/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

RuboCop full profile →SpotBugs full profile →

Machine formatsMarkdownJSONGraphQLMarkdown is open. JSON and GraphQL need a free key.

★RuboCop64

SpotBugs55

Attribute comparison across 2 tools
Attribute	RuboCopLeader	SpotBugs
vioscaleAI score	64 / 100medium · 50%	55 / 100low · 48%
Pricing
Free tierpricing.free_tier	✓	✓
Modelpricing.model	open_source	open_source
Price levelpricing.price_level	free	free
Transparentpricing.transparent	✓	-
Integrations
Countintegrations.count	14	3
Security
Scorecardsecurity.scorecard	5.1	4.5
Vulnerabilitiessecurity.vulnerabilities	Count: 1 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=rubygems&package_name=rubocop&per_page=100 · Last 12m: 0 · Max severity: LOW	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=com.github.spotbugs%3Aspotbugs-annotations&per_page=100 · Last 12m: 0
Reliability
Status pagereliability.status_page	-	✓
Adoption
Dependent reposadoption.dependent_repos	115,529	2,768
Github starsadoption.github_stars	12,913	3,954
Activity
Commits last 30dactivity.commits_last_30d	100	72
Release
Cadence daysrelease.cadence_days	16	27
Historyrelease.history	20 items	20 items
License
Spdxlicense.spdx	MIT	LGPL-2.1
Language
Primarylanguage.primary	Ruby	Java
Content
Faqcontent.faq	5 items	6 items

Score

vioscaleAI score

RuboCop64 / 100medium · 50%

SpotBugs55 / 100low · 48%

Pricing

Free tier

RuboCop✓

SpotBugs✓

Model

RuboCopopen_source

SpotBugsopen_source

Price level

RuboCopfree

SpotBugsfree

Transparent

RuboCop✓

SpotBugs–

Integrations

Count

RuboCop14

SpotBugs3

Security

Scorecard

RuboCop5.1

SpotBugs4.5

Vulnerabilities

RuboCopCount: 1 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=rubygems&package_name=rubocop&per_page=100 · Last 12m: 0 · Max severity: LOW

SpotBugsCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=com.github.spotbugs%3Aspotbugs-annotations&per_page=100 · Last 12m: 0

Reliability

Status page

RuboCop–

SpotBugs✓

Adoption

Dependent repos

RuboCop115,529

SpotBugs2,768

Github stars

RuboCop12,913

SpotBugs3,954

Activity

Commits last 30d

RuboCop100

SpotBugs72

Release

Cadence days

RuboCop16

SpotBugs27

History

RuboCop20 items

SpotBugs20 items

License

Spdx

RuboCopMIT

SpotBugsLGPL-2.1

Language

Primary

RuboCopRuby

SpotBugsJava

Content

Faq

RuboCop5 items

SpotBugs6 items

Capabilities

Feature-by-feature on the axes that matter for code quality tools. “-” means undocumented, not absent.

Capability comparison for Code Quality Tools
Capability	RuboCop	SpotBugs
Core
Function	Linter + formatter	Static analyzer
Language scope	Single-language	Single-language
Implementation language	Ruby	Java
Capability
Autofix	✓	✗
Config
Config model	Config file	Rule packs
Extensibility
Custom rules	✓	✓
Deployment
Deployment	CLI-local	CLI-local
Delivery
Editor integration	✓	✓
CI / VCS gating	✓	✓
Insight
Code metrics	✓	-
Performance
Incremental / monorepo aware	-	-
Licensing
Open-source	OSS	OSS
Commercial
Pricing model	Free	Free

Core

Function

RuboCopLinter + formatter

SpotBugsStatic analyzer

Language scope

RuboCopSingle-language

SpotBugsSingle-language

Implementation language

RuboCopRuby

SpotBugsJava

Capability

Autofix

RuboCop✓

SpotBugs✗

Config

Config model

RuboCopConfig file

SpotBugsRule packs

Extensibility

Custom rules

RuboCop✓

SpotBugs✓

Deployment

RuboCopCLI-local

SpotBugsCLI-local

Delivery

Editor integration

RuboCop✓

SpotBugs✓

CI / VCS gating

RuboCop✓

SpotBugs✓

Insight

Code metrics

RuboCop✓

SpotBugs-

Performance

Incremental / monorepo aware

RuboCop-

SpotBugs-

Licensing

Open-source

RuboCopOSS

SpotBugsOSS

Commercial

Pricing model

RuboCopFree

SpotBugsFree

What each one is

The product in its own terms, so the numbers below have context.

RuboCop

Leader

An open-source linter and formatter for Ruby that enforces the community style guide, identifies potential bugs, and can automatically correct many issues.

Independently observed

SpotBugs

SpotBugs performs static analysis on Java code to identify potential bugs and code quality issues.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

RuboCop

Leader

Open sourceFree tier

Free and open source

as of 2026-08-14verify ↗

SpotBugs

Open source

as of 2026-08-14verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platform and deployment support comparison
Supports	RuboCop	SpotBugs
CLIPlatforms	✓	✓
Self-hostedDeployment	✓	✓
On-premiseDeployment	✗	✓

Platforms

CLI

RuboCop✓

SpotBugs✓

Deployment

Self-hosted

RuboCop✓

SpotBugs✓

On-premise

RuboCop✗

SpotBugs✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

In common (1)

VS Code

RuboCop

Leader

19 total - 18 not shared

rubocop-performance
rubocop-rails
rubocop-rspec
rubocop-minitest
rubocop-rake
rubocop-sequel
rubocop-thread_safety
rubocop-capybara
rubocop-factory_bot
rubocop-rspec_rails
rubocop-i18n
Eglot
Helix
Flycheck
RubyMine
Emacs
Neovim
Zed

Independently observed

SpotBugs

7 total - 6 not shared

Maven
Gradle
Eclipse
Ant
fb-contrib
find-sec-bugs

Independently observed

Still deciding?

RuboCop or SpotBugs: which one depends on you

A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.

Free to run, no account needed to start. How the evaluation works

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.