API Clients Review

API Clients Review - 2024


In the rapidly evolving landscape of software development, APIs (Application Programming Interfaces) have emerged as the cornerstone for seamless communication between diverse applications and services. As developers navigate through the intricate web of APIs, the importance of efficient API client tools becomes paramount. These tools not only simplify the interaction with APIs but also streamline the development process, making it more agile and productive.

In this comprehensive blog article, we delve into the realm of API client tools, exploring and evaluating a myriad of options available to developers. Whether you're a seasoned developer seeking to optimize workflows or a newcomer looking for the ideal tool to start your API journey, this review aims to unravel the best API client tools

What is an API Client?

An API client serves as a crucial intermediary that facilitates the interaction between software applications and APIs (Application Programming Interfaces). In essence, it acts as a bridge, enabling developers to send requests to APIs and receive responses, thereby accessing and utilizing the functionalities and data offered by these APIs.

Think of an API client as a tool or software component that simplifies the complexities of communication between different systems. It abstracts away the technical intricacies, providing developers with a user-friendly interface or programming library to make HTTP requests, handle authentication, format data, and interpret responses from APIs.

API Client Description from Vendor Features Links
Postman Postman is an API platform for building and using APIs. Postman simplifies each step of the API lifecycle and streamlines collaboration so you can create better APIs—faster. windows mac os linux cli web client vs code extension
Curl Curl is used in command lines or scripts to transfer data. curl is also used in cars, television sets, routers, printers, audio equipment, mobile phones, tablets, medical devices, settop boxes, computer games, media players and is the Internet transfer engine for thousands of software applications in over twenty billion installations. cli open source
Paw The most advanced API tool for Mac. RapidAPI for Mac is a full-featured HTTP client that lets you test and describe the APIs you build or consume. It has a beautiful native macOS interface to compose requests, inspect server responses, generate client code and export API definitions. mac os
Thunder Client Hand-crafted lightweight Rest Client for testing APIs. Supports collections, environments, git collaboration and local storage. vs code extensioncli
Hoppscotch Hoppscotch is a lightweight, web-based API development suite. It was built from the ground up with ease of use and accessibility in mind providing all the functionality needed for API developers with minimalist, unobtrusive UI. web clientopen source
Insomnia Kong Insomnia is a collaborative open source API development platform that makes it easy to build high-quality APIs — without the bloat and clutter of other tools. windows mac os linux
Nightingale A modern, resource-friendly REST client for Windows 10. windows
Advanced REST Client Advanced REST client allows you to test your APIs. Easy and clean user interface helps you focus on your API and not tooling. Store your requests and projects on Google Drive and share it with your team. windows mac os linux open source
HTTPie HTTPie is making APIs simple and intuitive for those building the tools of our time. windows web client cli
ApiScout ApiScout is one and only Rest Client for macOS you will need while building, testing and describing your APIs. It's built for developers by developers. mac os

Postman Review


Postman Review

Postman stands as a pivotal tool in the realm of API development, offering a comprehensive suite of features that streamline the process of designing, testing, and collaborating on APIs. Renowned for its user-friendly interface and robust functionalities, Postman has established itself as a go-to solution for developers seeking efficiency and flexibility in managing APIs. 

Key Features of Postman

  1. Intuitive Interface: Postman's intuitive user interface simplifies the creation of HTTP requests, allowing users to effortlessly build and organize API requests. Its visually appealing workspace enables easy navigation and management of collections, requests, and environments. 
  2. Request Building and Testing: With Postman, developers can construct various types of requests (GET, POST, PUT, DELETE, etc.) and customize headers, parameters, authentication methods, and payloads. Its built-in testing framework facilitates the creation of automated tests, validating API responses for correctness and reliability. 
  3. Collection and Environment Management: Postman's collection feature allows users to organize API requests into folders, making it convenient to manage and share related requests as a cohesive unit. Environments enable the configuration of variables, easing the process of testing across different environments (e.g., development, staging, production). 
  4. Collaboration and Sharing: Collaboration is seamless in Postman, fostering teamwork through features like shared workspaces, comments, and team libraries. Developers can share collections, collaborate on API designs, and synchronize changes, promoting efficient teamwork and knowledge sharing. 
  5. Mock Servers and Documentation: Postman facilitates the creation of mock servers from API definitions, enabling developers to simulate API endpoints for testing purposes even before the actual implementation. Additionally, it offers tools to generate comprehensive API documentation automatically, simplifying the process of documenting APIs for internal or external use. 
  6. Integration and Automation: Postman seamlessly integrates with various third-party tools and services, allowing for enhanced automation and workflow customization. Integration with CI/CD pipelines, monitoring tools, and version control systems streamlines the development lifecycle. 
  7. Extensive Community Support: The Postman community is vibrant and supportive, offering a plethora of resources, including tutorials, templates, and forums. Users can tap into this wealth of knowledge to learn, troubleshoot, and explore best practices in API development. 

Postman Cons

  • Software is complex to use for first time users. Because of its rich functionality and plethora of options, the software requires a level of training that will allow users to proper leverage the solution. 
  • API Documentation could use some improvements. The documentation capabilities feels a bit cumbersome. 
  • Test cases with external dependencies are hard to manage. Connectivity to databases, or more programmatic test case writing is not easy to do. 

Overall, Postman's robust feature set, combined with its rich interface and collaborative capabilities, makes it a great tool for developers, QA engineers, and API enthusiasts alike. Its ability to simplify API testing, documentation, and collaboration contributes significantly to optimizing the API development process, making it a staple in modern software development workflows.

Curl Review


Curl Review

Despite its seemingly simple command-line interface, stands as a powerful and versatile API client tool widely favored among developers and system administrators alike. Renowned for its flexibility, efficiency, and portability, Curl excels in performing HTTP requests and is celebrated for its wide-ranging capabilities. 

Key Features of Curl: 

  1. Command-Line Interface: Curl's command-line interface (CLI) allows for quick and straightforward execution of HTTP requests directly from the terminal, providing developers with a lightweight and portable solution for API interaction. Its simplicity enables users to craft requests efficiently using various options and flags. 
  2. Wide Protocol Support: Curl supports a multitude of protocols beyond HTTP and HTTPS, including FTP, FTPS, SCP, SFTP, LDAP, and many others. This broad protocol support makes it a versatile tool capable of handling diverse data transfer requirements (outside of just API requests). 
  3. Customization and Flexibility: Users can tailor requests extensively by specifying headers, HTTP methods, request bodies, authentication methods, and more, offering a high degree of flexibility in crafting and fine-tuning requests according to specific needs. 
  4. Output Formatting and Data Handling: Curl offers options for handling response data, such as displaying headers only, saving output to files, or formatting responses in various ways. This flexibility in managing output facilitates easy parsing and manipulation of API responses. 
  5. Proxy Support and Network Operations: It provides support for proxies, allowing users to route requests through different proxy servers. 
  6. Cross-Platform Compatibility: Curl is available across multiple platforms, including Windows, macOS, and various Unix-like systems, ensuring consistent functionality and ease of use across different operating environments. 
  7. Scripting and Automation: Its command-line nature makes Curl highly conducive to scripting and automation. Developers can incorporate Curl commands into scripts and workflows, enabling automated testing, monitoring, and integration within larger systems or pipelines. 
  8. Open-Source and Community Support: Being an open-source tool, Curl enjoys extensive community support. Users can benefit from a wealth of documentation, forums, and resources contributed by the community, fostering learning and troubleshooting. 


  • Not easy for beginners, since there is no UI (interface) it’s hard to get a guided approach to building requests. 
  • Creating “complex” api requests is hard. Simple API requests are very straightforward on the Curl syntax, but as that simplicity goes away and more complex requests need to be built, the syntax on Curl could get quite cumbersome. 

Curl's command-line interface, coupled with its extensive feature set and support for multiple protocols, makes it a preferred choice for scenarios where simplicity, portability, and flexibility are paramount. While its command-line nature might initially present a learning curve for beginners, its versatility and capabilities make Curl an indispensable tool in the arsenal of developers, system administrators, and anyone handling HTTP requests and data transfers.

Paw Review


Paw Review

This macOS-exclusive application provides a comprehensive environment for designing, testing, and debugging APIs, making it a go-to choice for professionals seeking a powerful and intuitive API development experience. It seems the product is being re-branded as RapidAPI for Mac. 

Key Features of Paw: 

  1. Intuitive User Interface: Paw boasts an intuitive and visually appealing interface that simplifies the creation and organization of API requests. Its user-centric design facilitates seamless navigation and enhances the overall user experience. 
  2. Dynamic Request Building: The tool allows for the creation of complex API requests effortlessly, supporting various HTTP methods, custom headers, query parameters, authentication mechanisms (including OAuth), and request body formats. Users can generate requests using a multitude of built-in templates or create their own, fostering flexibility in API testing and exploration. 
  3. Environment and Variable Management: Paw offers robust support for managing environments, enabling users to define and switch between different sets of variables (e.g., URLs, API keys, tokens) for testing across various environments. This feature streamlines the testing process in different development stages. 
  4. Response Visualization and Validation: It provides a visual preview of API responses, aiding in understanding and validating the data returned by the API. Paw supports various response viewers for JSON, XML, HTML, and other formats, enhancing readability and analysis of API responses. 
  5. Code Generation and Integration: One of Paw's standout features is its ability to generate code snippets in multiple programming languages directly from API requests. This feature facilitates seamless integration with the user's codebase and accelerates the development process. 
  6. Extensions and Customization: Paw supports extensions that extend its functionality, allowing users to tailor the tool to their specific needs. Users can create their extensions or leverage existing ones from the Paw Extension Registry to enhance the tool's capabilities. 
  7. Collaboration and Teamwork: With built-in collaboration features, Paw facilitates team-based API development. Users can share workspaces, collaborate on API designs, and synchronize changes, fostering efficient teamwork and knowledge sharing. 
  8. Comprehensive Documentation: Paw simplifies the process of documenting APIs by providing tools to generate comprehensive documentation automatically. This documentation can be shared with team members or external stakeholders. 
  9. Easy migration tools. Paw provides extensions that allow easy migration from other API Clients. 

Overall, Paw's is a good client for Mac users. It provides a clean interface with a lot of functionality.

Thunder Client Review


Thunder Client review

Thunder Client is a lightweight and versatile API client extension specifically designed for Visual Studio Code. This tool aims to simplify API testing and development within the familiar environment of Visual Studio Code, offering a range of features tailored to enhance productivity and streamline the API testing process. 

Key Features of Thunder Client: 

  1. Seamless Integration with Visual Studio Code: Thunder Client seamlessly integrates into Visual Studio Code, allowing developers to work within their preferred coding environment. This integration ensures familiarity and ease of use for developers already accustomed to Visual Studio Code. 
  2. Leverage Visual Studio Code Interface: Thunder Client leverages the visual studio code user interface and simplifies the creation and execution of API requests by enabling an easy to use API request interface. It provides a visually appealing workspace for managing requests, collections, environments, and response data, ensuring easy navigation and organization. 
  3. Multiple Request Types and Customization: It supports various HTTP request types (GET, POST, PUT, DELETE, etc.) and allows customization of request headers, parameters, authentication methods, and body content, catering to diverse API testing requirements. 
  4. Environment Management: Thunder Client facilitates the creation and management of environments, enabling users to define variables (e.g., base URLs, authentication tokens) specific to different testing environments. This feature aids in seamless testing across multiple setups. 
  5. Response Handling and Visualization: The tool provides a clear visualization of API responses, aiding in understanding and validating the data returned by the API. Thunder Client supports response viewers for various formats, enhancing readability and analysis of API responses. 
  6. Collection Organization: Developers can organize API requests into collections, allowing for better management and sharing of related requests as a cohesive unit. This feature helps maintain a structured workflow and simplifies collaboration among team members. 
  7. Lightweight and Fast: Thunder Client is designed to be lightweight and fast, ensuring quick response times and smooth execution of API requests, thereby optimizing the testing and development process. 
  8. Extension Ecosystem: As an extension for Visual Studio Code, Thunder Client benefits from the extensive extension ecosystem of VS Code. Users can further enhance its capabilities through various available extensions, customizations, and integrations. 

Thunder Client's focus on simplicity, integration with Visual Studio Code, and its array of essential features for API testing and development make it an attractive choice for developers seeking a lightweight yet powerful tool within their familiar coding environment. Its intuitive interface, coupled with its ability to handle diverse API testing scenarios, contributes to a smoother and more efficient API development workflow within Visual Studio Code. 


  • Requires use of visual studio code. If not a VS developer, not much sense using it.



hoppscotch review

Hoppscotch API Request Builder, is anAPI client tool available as an open source web-based application and browser extension. You can leverage hopscotch directly on their web interface or download the source application from Github. 

Key Features of Hoppscotch API Request Builder: 

  1. Intuitive User Interface: Hoppscotch boasts a simple interface with a very clean design 
  2. Diverse HTTP Request Support: The tool supports various HTTP request methods (GET, POST, PUT, DELETE, and support for GraphQL.) and allows customization of headers, parameters, authentication methods, and request bodies, catering to diverse API testing and development needs. 
  3. Collections and Workspaces: Hoppscotch facilitates the organization of API requests into collections and workspaces, allowing for better management, grouping of related requests, and sharing of collections among team members. 
  4. Real-time Response Visualization: It provides a real-time preview of API responses, aiding in understanding and validating the data returned by the API. Users can view and analyze responses in different formats, enhancing readability and analysis of API data. 
  5. Environment Variables and Global Values: Hoppscotch supports the use of environment variables and global values, enabling users to define and switch between different sets of variables for testing across multiple environments, improving flexibility and efficiency. 
  6. Import and Export Functionality: The tool offers capabilities to import and export API requests and collections in various formats, allowing for easy sharing, backup, and migration of data across different instances. 
  7. Collaboration Features: Hoppscotch provides collaboration features, including sharing and syncing workspaces, fostering teamwork, and enabling multiple users to collaborate on API development projects. 
  8. Open-Source and Extensibility: Being open-source, Hoppscotch encourages community contributions and supports extensibility, allowing users to enhance its functionalities through customizations and extensions. 


  • No desktop app, for those that like client applications, the only way to use Hoppscotch is via web browser.



Insomnia Review

Insomnia, a popular API client tool, has earned acclaim for its sleek interface, comprehensive feature set, and focus on simplifying the API testing and development process. Available as a standalone desktop application for various operating systems, Insomnia has become a go-to choice for developers seeking an intuitive and powerful environment for designing, testing, and debugging APIs. 

Key Features of Insomnia: 

  1. Clean and Intuitive Interface: Insomnia offers a clean, user-friendly interface that facilitates easy navigation and efficient management of API requests, environments, workspaces, and collections, ensuring a smooth workflow. 
  2. Versatile Request Building: The tool supports a wide range of HTTP request methods (GET, POST, PUT, DELETE, etc.) and allows customization of headers, query parameters, authentication mechanisms (including OAuth), and request payloads, enabling flexible and comprehensive request creation. 
  3. Environments and Variables: Insomnia supports the creation and management of environments, allowing users to define variables specific to different testing environments. This feature simplifies testing across multiple setups and enhances productivity. 
  4. Request Chaining and Templating: Users can create request chains, enabling the extraction of values from one request to be used in subsequent requests, thereby facilitating complex API workflows. Insomnia also supports request templating for reusability and efficiency. 
  5. Code Generation and Exporting: Insomnia provides the ability to generate code snippets in various programming languages directly from API requests, streamlining integration with the user's codebase. It also supports exporting requests and collections in different formats for sharing and documentation purposes. 
  6. Real-time Response Visualization: The tool offers real-time previews of API responses, allowing users to visualize and validate data returned by the API in different formats, aiding in debugging and analysis. 
  7. Collaboration and Teamwork: Insomnia supports collaboration features, such as sharing workspaces, enabling multiple team members to collaborate on API projects, fostering efficient teamwork and knowledge sharing. 
  8. Plugins and Extensibility: Insomnia's extensible nature allows users to extend its functionalities through plugins and integrations, enabling customization and enhancing its capabilities based on specific requirements. Plugin Hub - Insomnia Insomnia has an extensive list of plugins and allow users to build their own. 


  • Not a lot of available documentation. 
  • Small user community.



Nightingale, an API client for Microsoft windows.  Stands out for its simplicity. With a clean interface, it allowed effortless navigation and organization of API requests. Supporting various HTTP methods, it offered customization options for headers, authentication, and request bodies. Nightingale enabled real-time response visualization, environment variable usage, and code generation. Collaborative features are in progress.


  • Project has not been updated in a while.
  • Lack of proper software support.

Advanced REST Client


advanced rest client arc review

A Mulesoft tool, advanced rest client provides a basic user interface to run API requests. It provides easy integration to Mulesoft’s Anypoint Exchange.

Advanced rest client is also able to read any API specification for easy-to-read documentation.  



httppie review

HTTPie is a user-friendly, command-line HTTP client that simplifies interactions with APIs. Renowned for its simplicity and ease of use, it offers a streamlined experience for making HTTP requests and handling API interactions. Client desktop applications are currently (as of January 2024) in Beta. 

Key Features of HTTPie: 

  1. Simple Command-Line Interface: HTTPie operates via a straightforward command-line interface (CLI), making it easy for users to compose and execute HTTP requests without complex configurations or setups. 
  2. Intuitive Syntax and Request Building: It utilizes a simple and intuitive syntax for constructing HTTP requests, supporting various methods (GET, POST, PUT, DELETE, etc.), custom headers, query parameters, request bodies, and authentication methods. 
  3. Output Customization and Formatting: HTTPie allows users to customize and format the output of API responses, providing options to display headers only, pretty-print JSON, or format responses according to specific preferences. 
  4. Session and Authentication Management: Users can manage sessions and persist authentication credentials across requests, streamlining the testing process by avoiding repeated authentication steps. 
  5. Plugin System and Extensions: HTTPie's plugin system enables users to extend its functionalities with custom scripts or third-party plugins, enhancing its capabilities based on specific needs or requirements. 
  6. JSON Support and Data Handling: It offers native support for JSON data, simplifying the handling and manipulation of JSON payloads in requests and responses. 
  7. HTTPS, Proxies, and Security: HTTPie supports HTTPS and allows users to configure proxies, ensuring secure communication and enabling requests to traverse different network setups. 
  8. Cross-Platform Compatibility: HTTPie is compatible with various operating systems, including Windows, macOS, and Linux, ensuring consistent functionality across different environments. 




api scout review

Mac OS REST API client. API Scout is gaining attention for its user-friendly interface and a range of functionalities aimed at simplifying API-related tasks. 

Key Features of API Scout: 

  1. Clean and Intuitive Interface: API Scout featured a clean and user-friendly interface, ensuring ease of navigation and management of API requests, endpoints, and collections. 
  2. Request Building and Customization: The tool allowed for the creation of various HTTP requests (GET, POST, PUT, DELETE, etc.) and enabled customization of headers, query parameters, authentication methods, and request bodies, ensuring flexibility in crafting requests. 
  3. Collections and Organization: Users could organize API requests into collections, aiding in better management, grouping of related requests, and facilitating sharing of collections among team members. 
  4. Response Visualization: API Scout provided real-time previews of API responses in different formats, aiding in validating data returned by the API and simplifying the debugging process. 
  5. Environment Variables: It supported the use of environment variables, allowing users to define and switch between different sets of variables for testing across multiple environments, enhancing flexibility in testing. 
  6. Exporting and Sharing: The tool offered capabilities to export requests and collections in various formats, enabling easy sharing and collaboration among team members. 
  7. Security and HTTPS Support: API Scout ensured secure communication by supporting HTTPS, allowing for secure interactions between the client and the API server. 
  8. Collaboration and Teamwork: Team collaboration, allows multiple users to work together on API projects.


In conclusion, the diverse landscape of API clients presents a myriad of options catering to different needs and preferences, offering developers an array of tools to streamline their workflow and enhance application integration. Whether it's about performance, simplicity, or specific functionalities, the reviewed API clients showcased a spectrum of features, empowering users to make informed choices based on their project requirements. Ultimately, navigating through these clients demands a careful consideration of factors such as ease of use, compatibility, and scalability. With the evolving nature of technology, staying updated on the latest advancements and innovations in API clients remains paramount. As the digital ecosystem continues to expand, these versatile tools will undoubtedly play an increasingly pivotal role in shaping the efficiency and success of software development endeavors.

Top Photo by Douglas Lopes on Unsplash

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