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Kover
What it is
Kover is a free, Apache-2.0-licensed toolkit maintained by Kotlin for collecting test coverage from Kotlin code compiled for the JVM and Android. The toolset includes Gradle and Maven plugins, a command-line interface, offline instrumentation, a JVM agent, and a features artifact. The Gradle plugin produces HTML and XML reports and supports coverage verification rules, with line, instruction, and branch coverage types. It works with Kotlin JVM, Kotlin Android, Kotlin Multiplatform, and the com.android.kotlin.multiplatform.library plugins, including mixed Kotlin and Java sources. JaCoCo can be used as an alternative for measurement and report generation. Kover supports Android build variants and host-test coverage. The Gradle plugin requires Gradle 6.8.3 or later, JVM 1.7 or later for tests, and Android Gradle Plugin 7.0.0 or later. It does not support JavaScript or native targets.
For and against
For
- HTML and XML coverage reports
- Line, instruction, and branch coverage
- Kotlin and Java source support
- Android build-variant coverage
- Apache-2.0 open-source license
Against
- No JavaScript or native Gradle targets
- No coverage from device instrumented tests
- Instrumentation may affect test performance
- Aggregated Plugin is an early prototype
The verdict
Kover provides several coverage collection tools and report formats for JVM and Android-oriented Kotlin projects. Teams should account for its unsupported targets, device-test limitation, and stated version requirements.
Who it suits
Kover suits Kotlin and Java teams measuring JVM or Android test coverage through Gradle, Maven, command-line, or related tooling. It is also relevant to projects needing report formats and coverage gates.
Plans and prices
Kover
Apache-2.0 licensed open-source project
Read 8 Oct 2026 · github.com
On the record
- Android test limit
- Kover does not collect coverage from instrumented tests running on an Android device.kotlin.github.io · read 8 Oct 2026
- Android variants
- Kover supports Android build variants and collects coverage from Android host tests.github.com · read 8 Oct 2026
- Instrumentation
- The Gradle plugin instruments classes as they are loaded into the JVM during tests, which may reduce performance or affect concurrent tests.github.com · read 8 Oct 2026
- Integrations
- The Gradle plugin works with Kotlin JVM, Kotlin Android, Kotlin Multiplatform, and com.android.kotlin.multiplatform.library plugins.github.com · read 8 Oct 2026
- Language support
- The Gradle plugin supports mixed Kotlin and Java sources and can use JaCoCo as an alternative for coverage measurement and report generation.kotlin.github.io · read 8 Oct 2026
- License
- The project repository identifies its license as Apache-2.0.github.com · read 8 Oct 2026
- Limit
- JavaScript and native targets are not supported by the Gradle plugin.kotlin.github.io · read 8 Oct 2026
- Maintainer
- The official documentation says kotlinx-kover is maintained by Kotlin.kotlin.github.io · read 8 Oct 2026
- Minimum versions
- The Gradle plugin requires Gradle 6.8.3 or later, JVM 1.7 or later for tests, and Android Gradle Plugin 7.0.0 or later.github.com · read 8 Oct 2026
- Prototype limitation
- The Kover Aggregated Plugin is described as an early prototype recommended only for test or pet projects.github.com · read 8 Oct 2026
- Purpose
- Kover is a set of tools for collecting test coverage of Kotlin code compiled for JVM and Android platforms.github.com · read 8 Oct 2026
- Reports
- The Gradle plugin generates HTML and XML coverage reports and supports coverage verification rules.kotlin.github.io · read 8 Oct 2026
- Support
- The repository links to contributing guidelines and a code of conduct.github.com · read 8 Oct 2026
- Toolset
- The toolset includes Gradle and Maven plugins, a command-line interface, offline instrumentation, a JVM agent, and a features artifact.github.com · read 8 Oct 2026
