SoapUI is a widely‑used open‑source tool for functional testing of SOAP and REST APIs. Looking for other solutions to design, execute, and automate API tests, performance checks, and security validations? Below are 20 popular alternatives covering API testing, load testing, and broader software quality needs.
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User‑friendly API development platform offering request building, automated testing with scripts, mock servers, and CI/CD integrations.
All‑in‑one test automation solution supporting web, mobile, API, and desktop testing with built‑in keywords and a low‑code UI.
Open‑source load testing tool that also supports functional API testing for HTTP, SOAP, REST, and JMS protocols.
Java DSL for simplifying REST API testing; integrates seamlessly with JUnit/TestNG and CI pipelines.
Behavior‑driven testing framework that combines API test‑automation, performance testing, and mock server capabilities in a single language.
Modern REST client with built‑in environment variables, scripting, and automated testing via plugins.
Model‑based test automation platform covering API, UI, and service testing with risk‑based testing analytics.
Enterprise‑grade API testing suite offering functional, security, and performance testing with extensive reporting.
Commercial version of SoapUI with advanced UI, data‑driven testing, and integrated load/security testing.
API management platform that includes built‑in testing, monitoring, and analytics for APIs at scale.
Cloud‑based API testing service focused on continuous testing, monitoring, and automated assertions.
Testing framework inspired by JUnit but with richer annotations, parallel execution, and flexible test configurations for API tests.
Java integration testing framework for SOAP, REST, JMS, and other protocols, supporting end‑to‑end scenario testing.
Mac‑only native HTTP client offering advanced request composition, dynamic values, and test scripting with JavaScript.
Simple .NET library for consuming and testing RESTful services; often used together with NUnit or xUnit.
Performance testing platform built on JMeter, providing cloud‑scale load testing, functional API testing, and CI integration.
Open‑source web‑based API request builder with real‑time response visualization and basic test scripting.
API monitoring and testing SaaS that captures request/response data, validates contracts, and integrates with CI pipelines.
Specialized load testing module from SmartBear that works alongside ReadyAPI functional tests for performance validation.
Enterprise load testing solution with support for API, web, and mobile applications, offering automatic script generation from traffic.