What is Psalm?
A free and open-source static analysis tool for PHP that identifies type-related bugs and security vulnerabilities in code, with automatic fixing capabilities.
Psalm pricing
Plans, per-tier features and add-ons, dated and linked to live pricing. Pricing changes often; always verify at source before you rely on it.
Free and open-source. Optional paid support contracts available.
Open Source
FreeFree and open-source static analysis tool for PHP
What Psalm 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
- Static analyzer
- Language scope
- Single-language
- Implementation language
- -
- Autofix
- ✓
- Config model
- Config file
- Custom rules
- ✓
- Deployment
- CLI-local
- Editor integration
- ✓
- CI / VCS gating
- ✓
- Code metrics
- -
- Incremental / monorepo aware
- -
- Open-source
- OSS
- Pricing model
- Free
Platform & deployment
Independently observed- CLI
- Self-hosted
Psalm 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 Psalm, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Capabilities | 67 | 16.00 | 1073.9 | ✓ |
| Release Cadence | 99 | 10.00 | 994.4 | ✓ |
| Pricing Transparency | 80 | 8.00 | 640.0 | ✓ |
| Price Level | 100 | 6.00 | 600.0 | ✓ |
| Github Stars | 71 | 5.00 | 355.5 | ✓ |
| Reliability | 0 | 8.00 | 0.0 | - |
| Integrations | 0 | 8.00 | 0.0 | - |
| Github Activity | 0 | 18.00 | 0.0 | - |
| Security Posture | 0 | 13.00 | 0.0 | - |
| Package Downloads | 0 | 26.00 | 0.0 | - |
| Stackoverflow Activity | 0 | 12.00 | 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.
Adoption
| Attribute | Value | Evidence |
|---|---|---|
| Github stars | 5,875 | highsource · 2026-08-03 · 90% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | {"autofix":true,"function":"static_analyzer","ci_gating":true,"deployment":"cli_local","open_source":"oss","config_model":"config_file","custom_rules":true,"pricing_model":"free","language_scope":"single_language","editor_integration":true} | mediumsource · 2026-08-03 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | PHP | highsource · 2026-08-03 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | MIT | highsource · 2026-08-03 · 95% |
Pricing
Release
| Attribute | Value | Evidence |
|---|---|---|
| Cadence days | 1 | mediumsource · 2026-08-03 · 70% |