Coverage.py

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About

Coverage.py is ranked #3 of 26 in test coverage tools on Inferse. It runs on API, Linux, macOS, Self-hosted, Windows. There is a free plan.

Compared on test coverage tools

Free plan: Yescoverage.readthedocs.io
Coverage types: statement, branchcoverage.readthedocs.io
Supported languages: Pythoncoverage.readthedocs.io
Report formats: text, HTML, XML, LCOV, JSONcoverage.readthedocs.io
Self-hosted option: Yescoverage.readthedocs.io
Coverage gates: Yescoverage.readthedocs.io

Facts

Purpose: Coverage.py measures which parts of Python programs ran and identifies executable code that did not run, commonly to gauge test effectiveness.coverage.readthedocs.io · 3 Oct 2026
Reports: It can produce text, HTML, XML, LCOV, and JSON reports.coverage.readthedocs.io · 3 Oct 2026
Contexts: Dynamic contexts can record which test function ran which lines of code.coverage.readthedocs.io · 3 Oct 2026
Integrations: Coverage.py can run test suites through their usual command, and pytest-cov is an available pytest plugin that the docs say is unnecessary for most purposes.coverage.readthedocs.io · 3 Oct 2026
Extensibility: Third-party plugins can extend measurement to non-Python files, such as mapping executed Python back to Django HTML templates.coverage.readthedocs.io · 3 Oct 2026
Storage and API: Coverage data is stored in a SQLite database, and advanced usage can use the Coverage.py API.coverage.readthedocs.io · 3 Oct 2026
Supported interpreters: The current documentation lists Python 3.10 through 3.15 rc2, including free-threading, and PyPy3 versions 3.10 and 3.11.coverage.readthedocs.io · 3 Oct 2026
Measurement cores: Coverage.py offers ctrace and pytrace tracing cores plus a sysmon core; sysmon is faster for simple line and branch coverage but does not yet support dynamic contexts or plugins.coverage.readthedocs.io · 3 Oct 2026
Security: The project directs vulnerability reports to Tidelift, which it says will coordinate the fix and disclosure.github.com · 3 Oct 2026
License: Coverage.py is licensed under the Apache 2.0 License.github.com · 3 Oct 2026
Support: Users can seek help on the Python discussion forums or Python Discord, report bugs on GitHub, and obtain professional support through Tidelift Subscription.coverage.readthedocs.io · 3 Oct 2026
Intended users: The documentation presents Coverage.py as a tool for people measuring Python test effectiveness by seeing which code tests exercise and which they miss.coverage.readthedocs.io · 3 Oct 2026