APIs Tools
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Postman AI
Freemium
Postman AI enhances the world-renowned API platform with AI-powered features including natural language API generation, automated test writing, and intelligent debugging suggestions. It integrates seamlessly into existing Postman workflows and supports team collaboration at scale. Ideal for developers who want to accelerate API lifecycle management with minimal overhead.
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Treblle
Freemium
Treblle is an AI-powered API observability and documentation platform that automatically captures, monitors, and documents every API request in real time. It provides intelligent error detection, performance insights, and auto-generated OpenAPI documentation without any code changes. Perfect for teams that need instant visibility into their API health and usage patterns across all environments.
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Zuplo
Freemium
Zuplo is a developer-first API gateway that brings enterprise-grade features like rate limiting, authentication, and monetization to any API in minutes. It uses a code-first configuration approach, integrates with GitHub for GitOps workflows, and deploys globally at the edge. Zuplo is ideal for startups and enterprises alike that need fast, scalable API management without vendor lock-in.
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Speakeasy
Freemium
Speakeasy automates the creation of production-ready SDKs from OpenAPI specifications across multiple programming languages including Python, TypeScript, Go, Java, and Ruby. It ensures the generated SDKs are idiomatic, well-documented, and stay in sync with API changes automatically. DevOps and platform engineering teams use Speakeasy to eliminate the manual burden of maintaining client libraries at scale.
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Scalar
Free
Scalar is a modern API documentation tool that renders beautiful, interactive API references from OpenAPI or Swagger specs. It provides a clean developer experience with live request testing, code samples in multiple languages, and easy embedding into any website or app. Scalar is open source and designed to replace outdated Swagger UI with a significantly more polished and functional interface.
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Hoppscotch
Free
Hoppscotch is a lightweight, open-source API development ecosystem that runs entirely in the browser with no installation required. It supports REST, GraphQL, WebSocket, SSE, and MQTT protocols and provides a clean, fast interface for building and testing API requests. Teams choose Hoppscotch as a privacy-friendly, self-hostable alternative to Postman with a significantly lighter footprint and an active open-source community.
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Apipheny
Freemium
Apipheny is a Google Sheets add-on that enables users to connect any API directly to their spreadsheet without writing code. It supports GET and POST requests, custom headers, authentication tokens, and automatic data refresh on a schedule. Business analysts, marketers, and non-developers use Apipheny to pull live data from APIs like Shopify, Google Analytics, or any REST endpoint directly into Google Sheets for reporting and analysis.
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Kong Gateway
Freemium
Kong Gateway is the most widely adopted open-source API gateway that provides traffic control, authentication, rate limiting, logging, and plugin-based extensibility for microservices and API architectures. It supports hybrid and multi-cloud deployments and offers a rich ecosystem of plugins for security, observability, and transformation. Platform and DevOps engineers at enterprises use Kong to manage, secure, and observe API traffic at massive scale across distributed systems.
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Mockoon
Free
Mockoon is a free, open-source API mocking tool that allows developers to create realistic mock REST APIs locally in seconds without any backend infrastructure. It supports dynamic responses, templating, request rules, proxy mode, and CLI integration for automated testing pipelines. Frontend developers and QA engineers use Mockoon to work independently of backend teams, simulate edge cases, and run integration tests without hitting production APIs.
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Stoplight
Freemium
Stoplight is an API design and documentation platform that enables teams to design APIs visually using OpenAPI standards before writing any code, ensuring consistency and quality from the start. It includes style guides, automated linting, mock servers, and collaborative review workflows that align developers, product managers, and consumers around a single source of API truth. API-first companies use Stoplight to reduce integration friction and ship well-documented, consistently designed APIs faster.
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RapidAPI
Freemium
RapidAPI is the world's largest API marketplace where developers can discover, test, and connect to thousands of APIs from a single platform with unified authentication and billing. It provides an API hub for enterprises to publish and monetize internal APIs, and a testing environment for developers to evaluate APIs before integration. Development teams use RapidAPI to accelerate integration work by finding production-ready APIs across categories like weather, finance, sports, AI, and communication.
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Insomnia
Freemium
Insomnia is an open-source REST and GraphQL API client that provides a clean, powerful interface for designing, debugging, and testing APIs with support for authentication flows, environment variables, and code generation. It offers a plugin ecosystem for extending functionality and supports collaborative workspaces for sharing API collections across teams. Developers choose Insomnia for its intuitive interface, native Git sync, and strong GraphQL support that makes it a compelling alternative to heavier API platforms.
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