Cucumber Open vs Locust

Cucumber Open runs automated acceptance tests from specifications written in plain language, helping teams check whether software behaves as described. It supports Behaviour-Driven Development by executing Gherkin specifications saved in `.feature` text files, typically alongside software in source control. Step definitions link the specification's steps to code that carries them out. Official implementations include JavaScript, Java, Ruby, Android Java, Kotlin, Scala, and C++, with semi-official and unofficial implementations also listed. Gherkin has variations for spoken languages, so teams can use keywords in their own language. Reporting options include built-in HTML, JSON, JUnit, and progress formatters, as well as custom formatters. Cucumber can run in continuous integration environments; its documentation describes JUnit output and a Jenkins reporting plugin. The project is free and open source, with local execution, parallel execution, browser testing, and API access. Published Cucumber Reports are public without authentication and deleted after 24 hours; the report service says data is stored in US data centers and encrypted at rest.

Locust is an open-source performance and load testing tool for HTTP and other protocols. Test scenarios are written in Python, with regular Python libraries available for use within them. Tests can run from the command line or web interface, which displays throughput, response times, and errors in real time; results can be exported for later analysis. The interface shows progress and lets users change load during a run. Locust can distribute tests across multiple machines and says it can support hundreds of thousands of concurrent users. Other systems and protocols can be tested by adding a client, and documentation lists community extensions for protocols and reporting. Optional OpenTelemetry support exports traces, metrics, and logs to compatible backends such as OTLP, Prometheus, Jaeger, and Tempo. Automatic instrumentation currently covers the requests library. Installation is documented with pip install locust or uvx. Locust is free and MIT-licensed. Its documentation also describes hosted load testing through Azure Load Testing, with reporting, Application Insights integration, and CI/CD support for Azure DevOps and GitHub Actions.