Ruff

Also known as: ruff

Available worldwide · Popular in: US

What is Ruff?

A fast Python linter built in Rust that consolidates multiple linting tools into a single interface. It supports over 500 rules, provides automated fixes for common issues, and runs significantly faster than traditional Python linters on even very large codebases.

Independently observed

What Ruff does

The capabilities that matter for code quality tools, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.

Core

Function: Linter
Language scope: Single-language
Implementation language: Rust

Capability

Autofix: ✓

Config

Config model: -

Extensibility

Custom rules: -

Deployment

Deployment: CLI-local

Delivery

Editor integration: ✓
CI / VCS gating: -

Insight

Code metrics: -

Performance

Incremental / monorepo aware: ✓

Licensing

Open-source: OSS

Commercial

Pricing model: Free

Independently observed

Platform & deployment

Independently observed

Platforms

CLI
macOS
Linux
Windows

Deployment

Self-hosted

Integrations (6)

Independently observed

Flake8
isort
Autoflake
Pyflakes
pycodestyle
Pylint

Security & compliance

Known vulnerabilities: 0 (0 in the last 12 months) sourcea count reflects scale & disclosure, not quality

Ruff FAQ

Common questions about Ruff, answered from independent, dated evidence.

What is Ruff?

Source: https://astral.sh/ruff

What platforms does Ruff support?

Ruff supports Windows, macOS, Linux and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.

Source: https://astral.sh/ruff

Can Ruff be self-hosted?

Yes. Ruff can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.

Source: https://astral.sh/ruff

What does Ruff integrate with?

We have confirmed 6 integrations for Ruff, including Flake8, isort, Autoflake, Pyflakes, pycodestyle and Pylint. This is what we could verify from public sources, so the vendor may support others we have not indexed.

Source: https://astral.sh/ruff

What security certifications does Ruff have?

We have independently confirmed GDPR for Ruff. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Ruff not holding them. Always confirm compliance directly before you rely on it.

Source: https://astral.sh/legal/privacy

Is Ruff open source?

Yes. Ruff is published under the MIT licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.

Source: https://github.com/astral-sh/ruff

Where is Ruff available?

Ruff is available worldwide. Its primary market is the United States. The vendor is headquartered in the United States.

Source: https://astral.sh/ruff

Ruff alternatives

Other code quality tools we track, ranked by the same independent score.

All Ruff alternatives, ranked →

Compare Ruff

Side by side against other code quality tools, attribute by attribute, with a source on every value.

Independent · unbought · dated

The vioscaleAI score: one lens on the evidence

Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Ruff, not the verdict.

Balanced composite 73 / 100

medium · 68%

Signal contributions to the composite score
Signal	Score	Weight	Contribution	Evidence
Package downloads	100	0.17	17.3	✓
Development activity	63	0.12	7.6	✓
Release cadence	96	0.07	6.4	✓
Dependent projects	63	0.08	5.0	✓
Capabilities	58	0.08	4.8	✓
Stars	89	0.03	2.9	✓
Integrations	24	0.05	1.3	✓
Security posture	5	0.09	0.0	-
Security score	0	0.05	0.0	-
Developer Q&A activity	0	0.08	0.0	-

Computed 2026-09-07. Re-weight it by intent, or see the full method.

All data & sourcesshow ↓

Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.

Activity

Attribute	Value	Evidence
Commits last 30dactivity.commits_last_30d	100	mediumsource · 2026-09-07 · 65%

Adoption

Attribute	Value	Evidence
Github starsadoption.github_stars	49,535	highsource · 2026-09-07 · 90%
Package downloads weeklyadoption.package_downloads_weekly	77,677,334	highsource · 2026-08-26 · 85%
Dependent reposadoption.dependent_repos	5,870	highsource · 2026-08-26 · 85%

Content

Attribute	Value	Evidence
Faqcontent.faq	7 items	mediumsource · 2026-09-10 · 69%

Features

Attribute	Value	Evidence
Capabilitiesfeatures.capabilities	Autofix: Yes · Function: linter · Deployment: cli_local · Incremental: Yes · Open source: oss · Impl language: Rust	mediumsource · 2026-08-14 · 60%

Integrations

Attribute	Value	Evidence
Countintegrations.count	6	mediumsource · 2026-08-14 · 60%

Language

Attribute	Value	Evidence
Primarylanguage.primary	Rust	highsource · 2026-09-07 · 90%

License

Attribute	Value	Evidence
Spdxlicense.spdx	MIT	highsource · 2026-09-07 · 95%

Market

Attribute	Value	Evidence
Availabilitymarket.availability	HqCountry: US · PrimaryMarkets: … · AvailabilityScope: global · AvailableCountries: … · NotAvailableCountries: …	highsource · 2026-08-14 · 75%

Pricing

Attribute	Value	Evidence
Modelpricing.model	commercial	lowsource · 2026-09-07 · 40%

Release

Attribute	Value	Evidence
Cadence daysrelease.cadence_days	7	mediumsource · 2026-09-07 · 70%
Historyrelease.history	20 items	mediumsource · 2026-09-07 · 70%

Security

Attribute	Value	Evidence
Gdprsecurity.gdpr	Yes	highsource · 2026-08-14 · 75%
Vulnerabilitiessecurity.vulnerabilities	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=ruff&per_page=100 · Last 12m: 0	highsource · 2026-08-26 · 90%

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