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Apache JMeter

Load testing with GUI-based test builder and extensive protocol support

Apidog

All-in-one API platform combining design, testing, mocking, and documentation in a single integrated workspace

Appium

Cross-platform mobile and desktop automation using WebDriver protocol with any language

Artillery

Modern load testing with YAML-based scenarios and built-in WebSocket support

Beeceptor

Quick HTTP mocking without local setup or installation

Better Stack

Modern log management and uptime monitoring with beautiful UI and fast search

Bruno

Offline-first, Git-friendly API client that stores collections as plain text files

Chance

Minimalist random generator for strings, numbers, and complex data structures

Charles Proxy

HTTP debugging proxy for viewing traffic between computer and internet

Cloudflare Forge

Self-hosted, pluggable generation of SDKs, CLIs, and docs from OpenAPI in CI

Cypress

Developer-friendly E2E testing with time-travel debugging and real-time reloads

Datadog

Unified observability platform with metrics, traces, logs, and APM in one place

Detox

Gray box E2E testing for React Native apps with synchronization and device control

Faker

Generating massive amounts of realistic fake data for testing

Fern

Code-first API tooling that generates SDKs, docs, and server code from a simple definition

Fishery

Type-safe factories for building test objects with sensible defaults

Flipper

Extensible mobile debugging platform with network inspector and plugin system

Gatling

Enterprise-grade load testing with detailed metrics and beautiful HTML reports

Grafana Loki

Cost-effective log aggregation inspired by Prometheus, designed for Grafana

Hoppscotch

Lightweight, browser-based API client with real-time collaboration and self-hosting options

Hoverfly

Service virtualization and API simulation with record/replay and templating

HTTPie

Human-friendly CLI for making HTTP requests with intuitive syntax and beautiful output

Insomnia

Developer-focused API client with GraphQL support and OpenAPI design tools

json-server

Spinning up a full fake REST API from a JSON file in seconds

k6

Developer-centric load testing with JavaScript scripting and Grafana integration

Keploy

API regression testing with tests and dependency mocks generated from real application traffic

⚠️ Submitted by the Keploy team

Locust

Python-based load testing with web UI for monitoring and distributed execution

Maestro

Simple YAML-based mobile UI testing for iOS and Android with fast, reliable execution

Microcks

Kubernetes-native API mocking and contract testing for multiple protocols

MirageJS

Building complete frontend applications without a backend using an in-memory database

Mockaroo

Generating large datasets in multiple formats via web interface or API

Mockifyer

Record/replay mocking with multi-service traffic logging and client lane isolation

⚠️ The maintainer of this site (Sebastian) is the author of Mockifyer.

Mockoon

Creating mock APIs with a desktop GUI and deploying them via CLI or Docker

Mountebank

Multi-protocol service virtualization supporting HTTP, HTTPS, TCP, and SMTP

MSW

Seamlessly mocking APIs in tests and development with client-side interception

New Relic

Usage-based full-stack observability (100 GB/month free ingest)

Nock

HTTP mocking and expectations in Node.js tests

OpenAPI Generator

Open-source SDK generation for 50+ languages from OpenAPI specifications

OpenObserve

OpenObserve claims 140x lower storage costs with petabyte-scale performance

OpenTelemetry

Vendor-neutral observability framework for collecting traces, metrics, and logs

Pact

Consumer-driven contract testing to ensure APIs meet consumer expectations

Pino

Extremely fast JSON logger for Node.js with low overhead and structured logging

Playwright

Cross-browser end-to-end testing with auto-wait and mobile device emulation

Polly.js

Recording and replaying HTTP interactions in Node.js and browser tests

Postman

Comprehensive API development platform with collaboration, testing, and documentation features

Postman Mock Servers

Cloud-hosted mock servers integrated with Postman collections

Prism

Generating mock servers directly from OpenAPI specifications

Prometheus

Time-series metrics collection and monitoring with powerful querying and alerting

Proxyman

Modern HTTP debugging proxy for macOS with native UI and advanced features

Reactotron

Desktop app for inspecting React and React Native apps with network logging

Redocly

OpenAPI linting, bundling, and beautiful documentation generation

Rozenite

Plug-and-play debugging panels inside React Native DevTools

Scalar

Interactive API reference docs and a REST API client from OpenAPI documents

Schemathesis

Property-based testing that automatically generates test cases from OpenAPI and GraphQL schemas

Sentry

Real-time error tracking and performance monitoring with rich context and release tracking

SigNoz

OpenTelemetry-native observability with unified metrics, traces, and logs

Speakeasy

Enterprise-grade SDK generation with idiomatic code and automatic publishing

Spectral

Flexible JSON/YAML linter for OpenAPI and custom API specifications

Stainless

Automated SDK generation and maintenance with type-safe, idiomatic code

Stoplight

Visual API design platform with collaborative editing and automatic documentation

Swagger Editor

Browser-based OpenAPI editor with live validation and documentation preview

Thunder Client

Lightweight REST API testing directly within VS Code and JetBrains IDEs without context switching

Winston

Flexible multi-transport logging library with rich formatting and extensibility

WireMock

Flexible mock server with record/replay and OpenAPI support for JVM ecosystems

Yaak

Local-first, privacy-focused API client built with Tauri for offline-first development

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