xUnit.net vs pytest

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.

xUnit.netpytest

Entry price

Free and open source

Open source

Free and open source

Open source

What drives the bill

The metric that actually scales your invoice.

Free and open source. You pay in engineering time and CI minutes.

Free tier

Everything, self-hosted

Open source

Apache-2.0

MIT

Self-hostable

No-code authoring

Languages

Python

Platforms

WebAPIDesktop

WebAPI

Fits teams

StartupScale-up / mid-marketEnterprise

Solo / side projectStartupScale-up / mid-marketEnterprise

Adoption

Category standard

.NET Foundation · since 2007

Category standard

pytest-dev · since 2004

Strengths

Per-test instance isolation eliminates a whole class of shared-state bugs by design.
Idiomatic modern C# — no attribute soup.
The default in current .NET project templates.

Fixtures are the best dependency-injection model in any test framework, and they compose cleanly.
Assertion introspection produces genuinely useful failure output from a plain assert.
Vast plugin ecosystem — pytest-xdist, pytest-cov, pytest-asyncio, pytest-django.

Limitations

Fixture scope and ordering become genuinely hard to reason about in large suites.
The magic that makes simple cases elegant makes complex cases opaque.
Python only.

Best for

New .NET projects.

Essentially every Python project.

All of these integrate with: GitHub Actions.

Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.