Coverlet

At a glance

• Editor score
  6.5 / 10
• Pricing
  Free plan
• Best for
  .NET developers needing build-integrated coverage
• Free plan
  Yes
• Paid from
  None
• Coverage types
  line, branch, method
• Facts checked
  20 Sep 2026

• Where it wins

  • Measures line, branch, and method coverage
  • Integrates with Microsoft Testing Platform, VSTest, and MSBuild
  • Supports filtering, merging, thresholds, and five report formats

• Where it doesn't

  • Primarily focused on .NET projects
  • Requires tests to run before coverage results are written
  • Uses packages and tooling rather than a hosted subscription

Our verdict on Coverlet

Coverlet is an open-source, cross-platform code-coverage framework for modern SDK-style .NET projects. It is designed for .NET developers and teams running automated tests locally or in continuous-integration environments. Coverlet instruments test assemblies and referenced assemblies, records sequence-point hits, and reports line, branch, and method coverage. It runs on Windows, macOS, and Linux, making it suitable for teams with different development and build environments.

Its strongest fit is build-integrated coverage. Microsoft Testing Platform, VSTest data-collector, MSBuild, and standalone .NET global-tool integrations give teams several ways to add coverage to existing .NET test workflows. Coverage thresholds can fail a build when configured requirements are not met, while include and exclude filters help control the measured scope. Results can also be merged, which supports workflows that produce coverage data across multiple test runs. Output is available in JSON, LCOV, OpenCover, Cobertura, and TeamCity formats.

Coverlet is free and open source, with no hosted subscription model. That makes it a practical choice for teams that want coverage tooling within their own .NET build and test process rather than a separate hosted service. It is less suitable for teams seeking broad multi-language coverage or a managed product with a hosted interface, because its published scope centers on .NET packages and tooling. Choose Coverlet when build gates, report-format flexibility, and integration with Microsoft testing workflows matter most; consider an alternative when coverage needs extend beyond the .NET ecosystem or require a hosted subscription experience.

Coverlet pricing

Coverlet fact sheet

Coverlet integrations

Coverlet lists 4 integrations on its own site.

• Microsoft Testing Platform
• VSTest
• MSBuild
• TeamCity

Alternatives to Coverlet

• CodecovA broad CI coverage platform with strong pull-request checks, analytics, and integrations.10.0
• CoverallsA mature coverage service for multi-language teams needing CI and pull-request visibility.9.2
• ReportGeneratorA flexible command-line coverage reporter with strong aggregation and history features.7.7

See all Coverlet alternatives →

Coverlet vs the competition

• CCoverlet vs Codecov
• CCoverlet vs Coveralls
• CCoverlet vs ReportGenerator
• COCoverlet vs OpenClover
• CJCoverlet vs JaCoCo
• CCPCoverlet vs Coverage.py

Compare Coverlet with any tool side by side →

Featured on iTechGuides

Coverlet is listed in our Test Coverage Tools directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

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Last updated 28 Sep 2026 · How we research and update