Compare the Top API Testing Tools as of April 2025

What are API Testing Tools?

API testing software is used to test and validate the functionality, performance, security, and reliability of Application Programming Interfaces (APIs). These tools help ensure that APIs perform as expected under various conditions and meet the required business and technical requirements. Features typically include automated testing, request/response validation, load testing, security testing (e.g., for vulnerabilities and authentication), and performance testing. API testing software often supports integration with continuous integration/continuous deployment (CI/CD) pipelines to facilitate automated testing as part of the software development lifecycle. Compare and read user reviews of the best API Testing tools currently available using the table below. This list is updated regularly.

  • 1
    Blackbird API Development
    Accelerate Development of Prod-Ready APIs. AI-Powered Code Gen, Mocking in Minutes, and On-Demand Ephemeral Test Environments. * Design Efficiently: Generate standardized OpenAPI specs with AI assistance, allowing you to begin coding faster. * Mock Effortlessly: Create shareable API mocks without manual coding, enabling rapid validation. * Automate Repetitive Tasks: Utilize AI to automatically generate boilerplate code for both client and server-side APIs. * Test Effectively: Access publicly available URLs for testing in a production-like test environment through Blackbird's ephemeral testing environments. * Debug Seamlessly: Set breakpoints and debug directly from your preferred IDE with Blackbird's integrated debugging tools. * Deploy Smoothly: Utilize a 24/7 hosted environment for progressive and repeated testing without reconfiguration, facilitated by Blackbird's containerized deployment.
    Starting Price: $69/month
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  • 2
    Treblle

    Treblle

    Treblle

    Treblle: A lightweight SDK for accelerated REST-based API development, see metadata for every API request with real-time API traffic monitoring, get powerful analytics and API governance features alongside API automated docs, and automated API security audits for every single request. Simplify workflows, enhance security with support for 18+ languages and frameworks for seamless integration. Empower your teams to build, ship, and maintain APIs faster.
    Starting Price: $99 per month
  • 3
    DevKit

    DevKit

    DevKit

    The Essential AI assistant for Developers. DevGPT combines ChatGPT and our 30+ mini-devtools to help you test public APIs, query databases, generate code and interactive art, and a lot more in just seconds to help you save 10s of hours every week! Build features swiftly and test them in isolation and then bring them into your codebase with confidence. Awaken the creative coder in you by experimenting with our code generation and p5.js tools to create cool art and mini games. While we have an amazing free community of 250+ developers on Discord, we have an even more amazing exclusive sub-community for our Pro users. All your favorite tools in one place. No need to manage multiple apps, websites, and CLI tools. Reduce context-switching and boost your productivity.
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