Best 11 Tools for Collaborating on API Development in 2025

Hoppscotch is an API development environment that runs in your web browser. You can test any API by sending requests and viewing the responses instantly. Unlike traditional tools, Hoppscotch is completely free and open-source, meaning anyone can use it or even contribute to improving it.

Firecamp is a multi-protocol API development tool that helps you test and build APIs with ease. Unlike traditional API clients that focus mainly on REST, Firecamp offers dedicated GUI playgrounds for REST, GraphQL, WebSocket, and Socket.IO protocols all in one application.

Insomnia is a desktop application that lets you test and work with APIs. Think of it as a specialized tool for developers who need to send requests to APIs and check the responses they get back. It supports all major API types, so you don't need different tools for different projects.

Testfully is a platform that helps developers test and monitor APIs during development and after deployment. You can use it to send requests to your APIs, create automated tests, and set up monitoring to catch problems before they affect users.

Theneo is an AI-native documentation platform that transforms how teams create and manage API documentation. Think of it as having an expert technical writer that works instantly - you provide your API specification files (like OpenAPI, Postman collections, or GraphQL schemas), and Theneo generates complete, interactive documentation automatically.

Replit is an online platform where you can write code, build apps, and publish them to the internet, all from your browser. No downloads or installations needed. It works like Google Docs but for creating software.

Sanity is a content platform that stores your content as structured data and makes it available through powerful tools. Unlike traditional systems where content and design are locked together, Sanity keeps them separate. This means you create content once and use it anywhere - websites, apps, smart devices, or anywhere else you need it.

Apidog is a platform that handles the complete process of creating and managing APIs. You can design your API structure, test how it works, create clear documentation, and share it with your team, all from one application.

Postman is an all-in-one platform for working with APIs throughout their entire lifecycle. It provides tools to send API requests, view responses, write tests, create documentation, and monitor performance. Unlike basic HTTP clients, Postman offers a complete environment where teams can organize their work into collections, share them with teammates, and automate testing.

Contentful is a headless content management system, which means it stores and organizes your content but does not control how it appears to users. Think of it like a smart storage room for all your digital content - text, images, videos, and more. When you need to show this content on your website, app, or any other platform, Contentful sends it instantly through connections called APIs.