Top 5 API Clients for Mobile Phones

Simon Holdorf
4 min readNov 14, 2022


#1 is my favorite

Photo by Neil Soni on Unsplash

Tools for working with APIs have grown in popularity recently due to the importance of reliable, performant, and secure APIs in developing high-quality products. As the modern world of work is increasingly focused on greater flexibility, mobile API clients are becoming widespread for software engineers and QA professionals.

What exactly is a mobile API client?

A Mobile API client is a mobile app that allows developers to communicate with APIs using their phones to identify bugs and test an API's overall performance and efficiency.

To keep up with this fast-paced sector, I’ve compiled a list of the best mobile API clients; they may benefit both novice testers and experienced DevOps professionals.

The 5 best mobile API clients are shown below:

1. API Tester

API Tester is a free API client offering various features for working with different types of APIs. This app makes it possible to send GET and POST requests on the go straight from your phone. It is designed for testing REST, GraphQL, WebSocket & SOAP APIs, and it’s mobile-optimized for building requests with the advanced parameters you’re used to seeing on your PC.

Three more reasons why you’ll love this app: import of collections from Postman, Swagger, Insomnia, and OpenAPI; automation to run all requests in sequence to reduce the testing time; and syntax-highlighted request body data redactor with a custom and convenient keyboard.

Free, designed for iOS, Android, iPadOS, macOS & watchOS.


2. Rest — HTTP API Client

Rest — HTTP API Client is another API testing tool with a robust UI and multiple functionalities. Users may use this app to create requests in seven different ways and their own unique methods. Although the app is free, certain features are only available as part of a premium membership, which costs $4,99 per month.

Among the commercial features are the ability to import collections from Postman by importing files or downloading collections from URLs, the addition of basic authentication headers, the following of redirection, the use of insecure SSL, the ability to make app design modifications, and many more. However, even with the free version, users can send API requests.

Free + subscription ($4,99 monthly) for advanced features, designed for iOS & iPadOS.

3. HTTP Fish

HTTP Fish is a free testing platform with basic functionality and an easy-to-use UI. This software allows you to create requests using seven basic methods, including GET, POST, and PUT, and save them in custom collections. Users may see complete information about each request, such as the body, info, headers, and cookies, and they can even add various parameters to their requests.

Free, designed for iOS & iPadOS.

4. REST API Client

REST API Client allows you to evaluate API performance by supporting various REST and GraphQL APIs. Users have access to five basic request mechanisms. Each request can include parameters, headers, auth data, and several types of Body types (Form- Data, Form-Urlencoded, and Raw).

The app offers a filter for requests that organizes them by month or year. In addition, the iPad version is built for usage with smart/magic keyboards and includes shortcuts for user convenience.

Free (you can remove app ads for $1,99), designed for iOS.

5. HTTP Requests

The HTTP Requests app is a free HTTP request client. A simple interface makes it easy to add new requests of various methods with parameters, headers, query params, and body of requests. This application also has a convenient feature of importing requests using cURL, which can significantly simplify routine tasks.

Furthermore, a specific tool for JSON comparison aids in validating JSON code and accepting any input directly. It is easy to switch between HTTP Request, Response, and JSON comparisons.

Free, designed for iOS & iPadOS.