442Crunch
42Crunch is an API security platform known for OpenAPI audit, conformance scanning and API protection, now positioned as an AI security platform for MCP servers used by AI agents.
API & contract testing
Tools for testing APIs, mocking them and checking contracts between consumers and providers.
78 tools
- 4
A AccelQ
AccelQ is a premium testing tool offering comprehensive automated, performance, and security testing features, seamlessly integrating for Web,API and Mobile with CI/CD pipelines
AAirbone
Airborne is an API automation testing tool built on the Ruby RSpec framework
AAkto
Akto is an MIT-licensed security platform that began in API security testing and now positions itself as security for AI agents, MCP servers and LLMs.
AAPI Fortress
A comprehensive and user-friendly tool for API testing, offering extensive features like a visual test composer, end-to-end testing, and strong CI/CD integration.
AApiary
Apiary provides the leading API-First platform designed specifically to help companies accelerate and control the design, development, and documentation of APIs.
AApickli
Test framework for behavior-driven API testing.
AAPITest
A simple and extensible behavioural testing library for Go.
AAssertible
Continuously test your web services.
B Beeceptor
Create AI-powered mock servers in seconds.
BBlazeMeter
Unify performance testing, API testing and monitoring, service virtualization, AI-powered test data, and functional testing in one platform.
BBruno
Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia).
CCATS
CATS is Endava's Apache-2.0 REST API fuzzer and negative-testing tool that generates, runs and reports tests for OpenAPI endpoints with no coding.
CCitrus
Framework for automated integration tests with focus on message-based applications.
CContextQA
ContextQA is an AI QA platform for web, mobile, API, SAP, Salesforce and AI agents that generates, runs and self-heals tests and exposes them to coding agents over MCP.
CCurl
A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, MQTTS,…
D DeepFake HTTP
DeepfakeHTTP is a web server that uses HTTP dumps as a source for responses. This tool allows you to test clients against REST, GraphQL, and other APIs.
DDredd
Language-agnostic HTTP API Testing Tool.
EEvoMaster
EvoMaster is an LGPL-3.0 open-source tool that uses AI search techniques to generate system-level tests for REST, GraphQL and RPC APIs, in white-box and black-box modes.
FFiddler
Explore Fiddler's web debugging tools and proxy solutions to debug, mock, capture, and modify web and network traffic.
FFrisby
Frisby is a REST API testing framework built on Jest that makes testing API endpoints easy, fast, and fun.
Gghz
ghz is an Apache-2.0 gRPC benchmarking and load-testing tool with a CLI, Go library and optional web app for storing and comparing results.
HHoppscotch
Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia.
HHoverfly
Lightweight service virtualization/ API simulation / API mocking tool for developers and testers.
HHTTPie
🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era.
HHttpMaster
Practical and easy-to-use software tool for testing HTTP applications and services.
HHyperTest
HyperTest is a no-code test automation tool that regresses all your APIs by auto-generating integration tests using your network traffic, also giving a way to reproduce these failures inside actual user-journeys.
IImposter
Scriptable, multipurpose mock server.
IInsomnia
The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC.
JJMeter
Apache JMeter open-source load testing tool for analyzing and measuring the performance of a variety of services.
JJSON Server
Quickly mock a REST API with JSON files.
KKarate
Test Automation Made Simple.
KKatalon Studio
Start API testing from today with Katalon.
KKeploy
Keploy is developer-centric API testing tool that creates tests along with built-in-mocks, faster than unit tests.
KKushoAI
KushoAI generates API test suites from OpenAPI specs or Postman collections, checks every change against the contract, and adds continuous API security scanning and UI testing.
LLoadmill
Loadmill is an AI verification layer that uses vision-based agents to check AI-built software across UI, API, mobile and performance, with an MCP server for coding agents.
MMayhem Security
Mayhem is an automated code and API security testing platform that uses fuzzing and AI to generate thousands of tests and report actionable, reproducible findings.
MMicrocks
Microcks is Open Source cloud-native tool for API Mocking and Testing.
MMirageJS
A client-side server to build, test and share your JavaScript app.
Mmitmproxy
mitmproxy is an MIT-licensed, interactive, TLS-capable intercepting proxy for HTTP/1, HTTP/2 and WebSockets, with console, command-line (mitmdump) and web (mitmweb) interfaces and Python addons.
MMockAPI
MockAPI is a simple tool that lets you easily mock up APIs, generate custom data, and perform operations on it using RESTful interface.
MMockLab
Platform for creating, testing, and sharing HTTP mock servers.
MMockoon
Mockoon is the easiest and quickest way to run mock APIs locally.
MMockServer
Open-source HTTP/1.1, HTTP/2, HTTP/3, HTTPS and gRPC mock server, recording proxy, and MCP server for AI assistants.
NNock
HTTP server mocking and expectations library for Node.js.
PPact
Fast, easy and reliable testing for integrating web apps, APIs and microservices.
PPactFlow
Fast, easy, and reliable testing for your APIs and microservices at scale.
PParasoft SOAtest
Optimize API and web service testing with AI-enhanced SOAtest.
PPaw (RapidAPI)
RapidAPI for Mac is a full-featured and beautifully designed Mac app that makes interaction with REST services delightful.Whether you are an API maker or consumer, RapidAPI…
PPostman
Go faster from development to production with higher accuracy and fewer tokens.
P PyRestTest
YAML based api testing and API microbenchmarking tool in Python
Q QuickMocker
API mocking and request inspection tool for development and testing.
RReadyAPI
The number one platform for Agile and DevOps teams, ReadyAPI powers functional, security, performance, and virtualization of SOAP & REST APIs.
RRest-Assured
Java DSL for easy testing of REST services.
R RestCase
RestCase supercharges the API development process resulting in improved team collaboration, reduced development time, better testing and increased overall productivity.
RRESTler
RESTler is Microsoft Research's MIT-licensed stateful REST API fuzzer that infers dependencies from an OpenAPI spec and exercises cloud services to find security and reliability bugs.
RRestQA
🦏 | Best in class Microservice automation testing.
RRestSharp
Simple REST and HTTP API Client for .NET.
RRoboHydra HTTP
RoboHydra Server is a great API testing solution for those who don’t have access to a server but need to test something.
RRunScope
API performance monitoring.
SSchemathesis
Schemathesis is an MIT-licensed property-based API testing tool that generates inputs from OpenAPI, GraphQL and gRPC schemas, chains stateful workflows and finds 500s, schema violations and validation gaps.
SSoapUI
SoapUI is a free and open source cross-platform functional testing solution for APIs and web services.
SStackHawk
StackHawk is a developer-focused application security testing platform, now positioned as an AI coding agent security platform that finds, fixes and verifies exploitable vulnerabilities; plans from $10 per user per month.
SStoplight Prism
Accelerate API development with realistic mock servers powered by API descriptions.
SSuperTest
Developer-friendly tool for testing Node.js HTTP servers and APIs
SSwaggerUI
Swagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.
TTelerek TestStudio
API testing with Test Studio helps you enhance your end-to-end testing strategy to cover test scenarios that require API calls.
TTestComplete
TestComplete offers a range of powerful features to help you scale your automated ui testing efforts and maximize test coverage.
TTestMace
Your IDE for working with an API.
TThunderclient
A Lightweight Rest Client for testing APIs. Supports collections, environments, git collaboration and local storage.
TTosca API Test
Tosca’s API Scan allows teams to easily create, manage, and execute automated API tests with a simple, no-code solution that literally anyone can use and adopt
TTrafficParot
Mock API server and message broker for TDD and API Testing
TTusk
Tusk is an AI testing platform that generates unit and API tests from production traffic and business context, self-heals them and reviews PRs as a verification layer for coding agents.
TTyk
Open Source API and AI Gateway supporting REST, GraphQL, TCP, gRPC and MCP (Model Context Protocol).
U Unirest
Unirest in Java: Simplified, lightweight HTTP client library.
VvRest
An effective online tool for automated REST API Testing.
WWireMock
A tool for mocking HTTP services.
ZZato API Test
With Zato API Test, you can test APIs in plain English, without any programming