Best API Clients for GraphQL

Bruno is a developer-first, open-source API client that’s redefining what an API tool should be. Built from the ground up for speed, privacy, and simplicity, Bruno offers everything developers need to explore, test, and document APIs without the cloud lock-in, telemetry, or bloat that’s become standard elsewhere. Instead of chasing “platform” status, Bruno focuses on doing one thing exceptionally well: being a pure API client. It’s completely local... all your requests, environments, and collections stay on your machine. Nothing is uploaded or tracked. The result is a faster, safer, and more transparent workflow that developers actually enjoy using. Bruno is also Git-native, meaning collections live in plain text and can be versioned, diffed, and reviewed just like code. Branching, merging, and pull requests all just work — no proprietary formats or walled gardens. For teams that already use GitHub, GitLab, or Bitbucket, Bruno slots right in with zero friction. Under the hood, Bruno supports Postman and Swagger imports, test scripting in JavaScript, a powerful CLI, VS Code extension, and CI/CD integration for automated API testing. Since its launch in 2022, Bruno has seen explosive community growth: over 2.5 million downloads, 150,000+ daily users, and 37,000+ GitHub stars. Trusted by engineers at Microsoft, Capital One, GitHub, and FedEx, Bruno is proving that developer tools don’t need a cloud backend to scale , they just need to respect how developers actually work. In short: Bruno is what the API client should have been all along ... local, fast, Git-based, and open-source.

Testfully offers an extensive array of features, ranging from robust API client capabilities to sophisticated testing and monitoring functionalities. Users can take advantage of versatile cloud and offline storage options, facilitate effortless collaboration among teams, and enjoy straightforward migration, all within a single, comprehensive multi-platform tool. The platform simplifies the transition of data from Postman or Insomnia, allowing for seamless integration into Testfully. With a focus on flexibility and security, users can establish global, environment, and folder variables tailored to either the workspace or individual users. The tool also allows for the customization of authentication methods, parameters, headers, and body content, making it easy to create any HTTP request. Collaboration is made simple as you can invite team members, assign specific roles, and manage folder permissions effectively. Testfully supports major authorization schemes such as OAuth2, ensuring secure and efficient access management. Whether you are dealing with straightforward tasks or more intricate scenarios, Testfully streamlines the testing process without requiring any coding skills, thus making advanced API testing more approachable and user-friendly. Users can execute requests within a folder either simultaneously, sequentially, or in a random order with a single click, enhancing efficiency. Additionally, it allows for response validation and contract testing through a declarative format, further eliminating the need for coding and simplifying the overall testing experience. Overall, Testfully is designed to cater to both novice and experienced users, ensuring that everyone can leverage its capabilities effectively.

Hoppscotch simplifies the process of creating and testing APIs, enabling quicker product launches. Build APIs with speed, conduct instant tests, and automatically document and share your work. From initial prototypes to final production, you can develop efficiently without the hassle of switching between different tabs. Everything necessary for seamless API development is provided by Hoppscotch. Set up dedicated workspaces for your teams, controlling access as needed. Collaborate with your colleagues in real-time, ensuring smooth teamwork. You can even deploy Hoppscotch on your own servers for added flexibility. Organize your requests into collections or folders to facilitate sharing with your team. Manage your environment variables for consistent usage across your projects. Additionally, keep track of your request history for easy reference. Modify headers, authenticate your requests, generate random data, and explore many more features at your disposal. Test your APIs thoroughly and write assertions to verify responses. Hoppscotch supports over 30 languages, allowing you to use it in your preferred tongue. Keep an eye on all activities within your workspace, tracking who performed actions and when. Utilize your existing SSO provider for easy login to Hoppscotch, and efficiently manage your users, workspaces, and other resources. Furthermore, the intuitive interface ensures that both novices and experienced developers can navigate the platform effortlessly.

Yaak is a nimble, privacy-centric desktop API client crafted for developers to efficiently test, debug, and engage with APIs in a streamlined environment without the dependency on cloud solutions. It operates entirely offline, ensuring that all information is kept locally on the user's device, with encrypted credentials and no telemetry, which guarantees comprehensive control over sensitive data while eliminating the necessity for accounts or third-party servers. Supporting a diverse array of protocols such as REST, GraphQL, gRPC, WebSockets, and Server-Sent Events, it empowers developers to manage various APIs seamlessly within one interface. The client boasts functionalities like dynamic request templating with customizable variables and functions, request chaining, and comprehensive debugging tools for analyzing headers, cookies, payloads, and responses. Additionally, Yaak enhances collaboration by integrating with Git, allowing users to save workspaces as plain files for version control, all while ensuring data security through its encrypted handling methods. This approach not only streamlines the development process but also fortifies the protection of sensitive information throughout the workflow.