EclEmma vs OpenClover

EclEmma is a Java code coverage tool that brings coverage analysis into the Eclipse workbench. It supports local Java applications, Eclipse and RCP applications, Equinox OSGi, JUnit, TestNG, Eclipse plug-in and RAP tests, SWTBot tests, and Scala applications. Its Coverage view summarizes results by project and lets developers inspect methods; source editors highlight covered and uncovered code. Coverage summaries can use instruction, branch, line, method, type and cyclomatic complexity counters. Users can switch among coverage sessions or merge results from separate test runs. EclEmma imports JaCoCo.exec data and exports reports in HTML, XML or CSV, as well as JaCoCo execution data files. It is based on JaCoCo and can be installed through the Eclipse Marketplace Client, an update site or manually. The free plug-in is listed at free under the Eclipse Public License 2.0. It requires Eclipse 3.8 or higher, Java 1.5 or higher, and Eclipse Java development tools; the project states that it has no operating-system dependency. Its Eclipse integration focuses on individual developers, with JaCoCo integrations suggested for automated builds.

OpenClover is a free code coverage tool for Java, Groovy and AspectJ. It tracks global, per-test and distributed per-test coverage using method, statement and branch metrics. More than 20 built-in code metrics are included, and custom metrics are supported. Coverage reports can be generated as HTML, XML, PDF, JSON or text. You can narrow coverage scope by paths, classes, methods, code blocks, statements, complexity or inline comments. For test optimization, OpenClover identifies tests to rerun when classes change, can run failing tests first, and can randomize test order. Integrations include Ant, Maven, Gradle, Grails, Griffon, Jenkins, Bamboo, Eclipse, IntelliJ IDEA, Sonar and JIRA. Dedicated test support covers JUnit 3 and 4, TestNG and Spock. Version 5.1.x supports JRE or JDK 8 through 25 and Groovy 3.x, 4.x and 5.x. The project is volunteer-maintained and Apache 2.0 licensed; community support typically responds within a few days.