Comparison

Black vs Psalm

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.

Machine formatsJSONMarkdownGraphQLor send Accept: application/json
Black73
Psalm63
Score
Vioscale score
Black73 / 100high · 78%updating
Psalm63 / 100low · 33%updating
Pricing
Free tier
Black
Psalm
Model
Price level
Blackfree
Psalmfree
Transparent
Black
Psalm
Integrations
Count
Black8
Psalm
Adoption
Dependent repos
Black105,588
Psalm15,920
Github stars
Black41,816
Psalm5,884
Package downloads weekly
Psalm
Activity
Commits last 30d
Black29
Psalm
Release
Cadence days
Black31
Psalm1
History
License
Spdx
BlackMIT
PsalmMIT
Language
Primary
BlackPython
PsalmPHP

Capabilities

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

Core
Function
BlackFormatter
PsalmStatic analyzer
Language scope
BlackSingle-language
PsalmSingle-language
Implementation language
BlackPython
PsalmPHP
Capability
Autofix
Black
Psalm
Config
Config model
BlackZero-config
PsalmConfig file
Extensibility
Custom rules
Black
Psalm
Deployment
Deployment
BlackBoth
PsalmCLI-local
Delivery
Editor integration
Black
Psalm-
CI / VCS gating
Black
Psalm-
Insight
Code metrics
Black
Psalm
Performance
Incremental / monorepo aware
Black
Psalm-
Licensing
Open-source
BlackOSS
PsalmOSS
Commercial
Pricing model
BlackFree
PsalmFree

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

Psalm

Psalm is a free, open-source static analyzer for PHP that identifies type-related errors and bugs in codebases at their strictest settings. It can automatically fix many common issues and supports safe coding patterns used in other languages.

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 verify ↗

Psalm

Open sourceFree tier

Free and open-source. Optional paid support contracts available.

  • Open SourceFree
as of verify ↗

Platform & deployment

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

Platforms
CLI
Black
Psalm
Deployment
Self-hosted
Black
Psalm

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

Psalm

Not documented yet.

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

Black vs Psalm: an evidence-based comparison · Vioscale