Comparison

Black vs Qlty

On the evidence we track, Black leads this comparison with a composite score of 73/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Black full profile →Qlty full profile →

Machine formatsJSON Markdown GraphQLor send Accept: application/json

★Black73

Qlty52

Attribute comparison across 2 tools
Attribute	BlackLeader	Qlty
Vioscale score	73 / 100high · 78%	52 / 100medium · 54%
Pricing
Free tierpricing.free_tier	✓	✓
Modelpricing.model	open_source	freemium
Price levelpricing.price_level	free	mid
Transparentpricing.transparent	✓	✓
Integrations
Countintegrations.count	8	6
Security
Disclosure policysecurity.disclosure_policy	✓	-
Scorecardsecurity.scorecard	7.7	-
Soc2security.soc2	-	✓
Vulnerabilitiessecurity.vulnerabilities	Count: 2 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=black&per_page=100 · Last 12m: 1 · Max severity: HIGH	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=cargo&package_name=qlty-cloud&per_page=100 · Last 12m: 0
Reliability
Status pagereliability.status_page	-	✓
Adoption
Dependent reposadoption.dependent_repos	105,588	0
Github starsadoption.github_stars	41,816	3,130
Package downloads weeklyadoption.package_downloads_weekly	39,005,228	-
Activity
Commits last 30dactivity.commits_last_30d	29	9
Release
Cadence daysrelease.cadence_days	31	4
Historyrelease.history	20 items	20 items
License
Spdxlicense.spdx	MIT	-
Language
Primarylanguage.primary	Python	Rust
Market
Availabilitymarket.availability	-	Available worldwide · Popular in US

Score

Vioscale score

Black73 / 100high · 78%

Qlty52 / 100medium · 54%

Pricing

Free tier

Black✓

Qlty✓

Model

Blackopen_source

Qltyfreemium

Price level

Blackfree

Qltymid

Transparent

Black✓

Qlty✓

Integrations

Count

Black8

Qlty6

Security

Disclosure policy

Black✓

Qlty–

Scorecard

Black7.7

Qlty–

Soc2

Black–

Qlty✓

Vulnerabilities

BlackCount: 2 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=black&per_page=100 · Last 12m: 1 · Max severity: HIGH

QltyCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=cargo&package_name=qlty-cloud&per_page=100 · Last 12m: 0

Reliability

Status page

Black–

Qlty✓

Adoption

Dependent repos

Black105,588

Qlty0

Github stars

Black41,816

Qlty3,130

Package downloads weekly

Black39,005,228

Qlty–

Activity

Commits last 30d

Black29

Qlty9

Release

Cadence days

Black31

Qlty4

History

Black20 items

Qlty20 items

License

Spdx

BlackMIT

Qlty–

Language

Primary

BlackPython

QltyRust

Market

Availability

Black–

QltyAvailable worldwide · Popular in US

Capabilities

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

Capability comparison for Code Quality Tools
Capability	Black	Qlty
Core
Function	Formatter	Quality platform
Language scope	Single-language	Multi-language
Implementation language	Python	Rust
Capability
Autofix	✓	✓
Config
Config model	Zero-config	Config file
Extensibility
Custom rules	✗	✓
Deployment
Deployment	Both	Both
Delivery
Editor integration	✓	✓
CI / VCS gating	✓	✓
Insight
Code metrics	✗	✓
Performance
Incremental / monorepo aware	✗	✓
Licensing
Open-source	OSS	Open-core
Commercial
Pricing model	Free	Per-contributor

Core

Function

BlackFormatter

QltyQuality platform

Language scope

BlackSingle-language

QltyMulti-language

Implementation language

BlackPython

QltyRust

Capability

Autofix

Black✓

Qlty✓

Config

Config model

BlackZero-config

QltyConfig file

Extensibility

Custom rules

Black✗

Qlty✓

Deployment

BlackBoth

QltyBoth

Delivery

Editor integration

Black✓

Qlty✓

CI / VCS gating

Black✓

Qlty✓

Insight

Code metrics

Black✗

Qlty✓

Performance

Incremental / monorepo aware

Black✗

Qlty✓

Licensing

Open-source

BlackOSS

QltyOpen-core

Commercial

Pricing model

BlackFree

QltyPer-contributor

What each one is

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

Black

Leader

An opinionated Python code formatter that automatically reformats code according to a standardized style. It produces minimal diffs for cleaner code review and reduces developer cognitive load by removing formatting decisions, allowing focus on code logic.

Independently observed

Qlty

A code quality platform that automatically analyzes pull requests for linting, formatting, security issues, and code coverage with AI-generated fixes. Supports 40+ languages and integrates with GitHub, IDEs, and CI systems.

Independently observed

Pricing

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

Black

Leader

Open sourceFree tier

Free and open source (MIT licensed)

as of 2026-08-14verify ↗

Qlty

from $20/moSubscriptionFree tier

Free plan available. Pro from $20/contributor/month. Enterprise from $30/contributor/month. Annual plans include 2 months free.

FreeFree
- Unlimited public and private repositories
- Unlimited contributors
- 1,000 analysis minutes per month
- 100 AI autofixes per month
- Linting and auto-formatting
- +8 more
Pro$20/contributor/month. Annual billing includes 2 months free.
- Everything in Free, plus:
- Shared configurations
- Trends and hotspots
- 1 year of history
- Accelerated analysis
- +6 more
EnterpriseContact sales
- Everything in Pro, plus:
- Advanced analytics
- Organization policies
- Custom permissions
- Audit logs
- +9 more

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	Black	Qlty
WebPlatforms	✗	✓
macOSPlatforms	✗	✓
WindowsPlatforms	✗	✓
LinuxPlatforms	✗	✓
CLIPlatforms	✓	✓
Cloud / SaaSDeployment	✗	✓
Self-hostedDeployment	✓	✗

Platforms

Web

Black✗

Qlty✓

macOS

Black✗

Qlty✓

Windows

Black✗

Qlty✓

Linux

Black✗

Qlty✓

CLI

Black✓

Qlty✓

Deployment

Cloud / SaaS

Black✗

Qlty✓

Self-hosted

Black✓

Qlty✗

Integrations

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

Black

Leader

8 total

Neovim
conform.nvim
ALE
SublimeText
Pre-commit
Jupyter Notebooks
blacken-docs
blackdoc

Independently observed

Qlty

6 total

GitHub
Visual Studio Code
GitHub Actions
CircleCI
Chrome
Firefox

Independently observed

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