Free
ByteCap
ByteCap is a cloud-based platform that monitors API uptime, tests API functionality, tracks webhooks, and sends alerts to maintain API reliability and performance.
Free
Spider Clients
Spider Clients is a free, open-source web-based tool for testing REST and GraphQL APIs by sending customizable HTTP requests and viewing responses.
Free
Hedra
Hedra is an open source load testing tool that enables developers and DevOps teams to simulate distributed traffic and measure application performance, supporting flexible scripting and CI/CD integration.
Free
Yazero
Yazero Validator is a free online tool that validates JSON data against JSON Schema to ensure data correctness and API response compliance.
Free
Hedra
Hedra is an open-source load testing tool that helps developers simulate realistic traffic patterns to test API and web service performance, supporting multi-stage scenarios and CI/CD integration.
Free Trial
Aspen – API Testing for macOS
Aspen is a native macOS application for API testing that enables developers to send HTTP requests, customize them, and inspect responses, focusing on local API debugging.
Free
Backengine
Backengine is a web platform that enables developers to create mock APIs, monitor API calls in real-time, debug issues, and collaborate with teams to streamline API development and testing.
Free
API Governance Testing
API Governance Testing is an open-source tool that automates API contract validation, enforces governance policies, and integrates with CI/CD pipelines to ensure secure and reliable API management.
Free
HTTPie AI
HTTPie AI is an AI-enhanced HTTP client that helps developers test, debug, and automate API workflows through an intuitive interface and scripting capabilities.