Tool catalog

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

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

Appium

Apache-2.0

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

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

Quick HTTP mocking without local setup or installation.

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

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

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

HTTP debugging proxy for viewing traffic between computer and internet.

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

Cypress

MIT

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

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

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

Generating massive amounts of realistic fake data for testing.

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

Type-safe factories for building test objects with sensible defaults.

Extensible mobile debugging platform with network inspector and plugin system.

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

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

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

Service virtualization and API simulation with record/replay and templating.

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

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

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

Developer-centric load testing with JavaScript scripting and Grafana integration.

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

⚠️ Submitted by the Keploy team

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

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

Kubernetes-native API mocking and contract testing for multiple protocols.

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

Generating large datasets in multiple formats via web interface or API.

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

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

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

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

MSW

MIT

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

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

HTTP mocking and expectations in Node.js tests.

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

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

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

Consumer-driven contract testing to ensure APIs meet consumer expectations.

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

Playwright

Apache-2.0

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

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

Postman

Proprietary

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

Cloud-hosted mock servers integrated with Postman collections.

Generating mock servers directly from OpenAPI specifications.

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

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

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

OpenAPI linting, bundling, and beautiful documentation generation.

Plug-and-play debugging panels inside React Native DevTools.

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

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

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

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

Enterprise-grade SDK generation with idiomatic code and automatic publishing.

Flexible JSON/YAML linter for OpenAPI and custom API specifications.

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

Visual API design platform with collaborative editing and automatic documentation.

Browser-based OpenAPI editor with live validation and documentation preview.

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

Flexible multi-transport logging library with rich formatting and extensibility.

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

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