What is Ruff?
An extremely fast Python linter written in Rust that supports over 500 rules with powerful autofix capabilities. Replaces dozens of tools with a single, unified interface.
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.
- Function
- Linter + formatter
- Language scope
- Single-language
- Implementation language
- Rust
- Autofix
- ✓
- Config model
- -
- Custom rules
- -
- Deployment
- -
- Editor integration
- -
- CI / VCS gating
- -
- Code metrics
- -
- Incremental / monorepo aware
- -
- Open-source
- OSS
- Pricing model
- -
Platform & deployment
Independently observed- CLI
- Self-hosted
Integrations (2)
Independently observed- Flake8
- isort
Ruff alternatives
Other code quality tools we track, ranked by the same independent score.
The Vioscale 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.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Package Downloads | 100 | 0.20 | 20.0 | ✓ |
| Github Activity | 63 | 0.14 | 8.7 | ✓ |
| Release Cadence | 96 | 0.08 | 7.4 | ✓ |
| Capabilities | 29 | 0.12 | 3.6 | ✓ |
| Github Stars | 89 | 0.04 | 3.4 | ✓ |
| Integrations | 14 | 0.06 | 0.9 | ✓ |
| Price Level | 0 | 0.05 | 0.0 | - |
| Reliability | 0 | 0.06 | 0.0 | - |
| Security Posture | 5 | 0.10 | 0.0 | - |
| Pricing Transparency | 0 | 0.06 | 0.0 | - |
| Stackoverflow Activity | 0 | 0.09 | 0.0 | - |
Computed . 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 30d | 100 | mediumsource · 2026-08-01 · 65% |
Adoption
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | {"autofix":true,"function":"linter_formatter","open_source":"oss","impl_language":"Rust","language_scope":"single_language"} | mediumsource · 2026-08-05 · 60% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 2 | mediumsource · 2026-08-05 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | Rust | mediumsource · 2026-08-01 · 63% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | MIT | highsource · 2026-08-01 · 95% |
Pricing
| Attribute | Value | Evidence |
|---|---|---|
| Model | commercial | mediumsource · 2026-08-05 · 60% |
Release
| Attribute | Value | Evidence |
|---|---|---|
| Cadence days | 7 | mediumsource · 2026-08-01 · 70% |
Security
| Attribute | Value | Evidence |
|---|---|---|
| Gdpr | Yes | highsource · 2026-08-05 · 75% |