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#2 Postman
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.
#5 Rest-Assured
Java DSL for simplifying REST API testing; integrates seamlessly with JUnit/TestNG and CI pipelines.
#6 Karate DSL
Behavior‑driven testing framework that combines API test‑automation, performance testing, and mock server capabilities in a single language.
#7 Insomnia
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.
#12 Assertible
Cloud‑based API testing service focused on continuous testing, monitoring, and automated assertions.
#13 TestNG
Testing framework inspired by JUnit but with richer annotations, parallel execution, and flexible test configurations for API tests.
#14 Citrus Framework
Java integration testing framework for SOAP, REST, JMS, and other protocols, supporting end‑to‑end scenario testing.
#15 Paw
Mac‑only native HTTP client offering advanced request composition, dynamic values, and test scripting with JavaScript.
#16 RestSharp
Simple .NET library for consuming and testing RESTful services; often used together with NUnit or xUnit.
#17 BlazeMeter
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.
#19 Runscope
API monitoring and testing SaaS that captures request/response data, validates contracts, and integrates with CI pipelines.
#20 ReadyAPI LoadUI
Specialized load testing module from SmartBear that works alongside ReadyAPI functional tests for performance validation.
#21 NeoLoad
Enterprise load testing solution with support for API, web, and mobile applications, offering automatic script generation from traffic.