Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.
Entry price
Free and open source
Open sourceFree and open source
Open sourceWhat drives the bill
The metric that actually scales your invoice.
Free and open source. You pay in engineering time and CI minutes.
Free and open source. You pay in engineering time and CI minutes.
Free tier
Everything, self-hosted
Everything, self-hosted
Open source
PSF
BSD-3-Clause
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Widely used
Python Software Foundation · since 2001
Category standard
Sebastian Bergmann · since 2004
Strengths
Limitations
Best for
Standard-library-only environments and codebases that already use it.
Every PHP project, directly or through a wrapper.
All of these integrate with: GitHub Actions.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.