Restler is a free REST API client for Android 9.0 developed by Tiago Melo. It is designed to be simple and easy to use, allowing you to send custom HTTP/HTTPS requests and test your REST API anywhere and anytime. Restler comes with a variety of features such as saving and organizing your requests in folders, parsing and displaying the complete raw response, and supporting authentication methods like Basic, Bearer Token, Hawk and Digest.

Restler also allows you to import and export collections from Postman, Insomnia, or Restler format. You can manage cookies and send them with your request, autocomplete headers with commonly-used values, switch between HTTP, HTTPS, and HTTP2, and beautify the response body received.

With Restler, you can also use tabs to keep multiple requests open at the same time and switch between them without losing data. It also supports client certificates, proxy servers, DNS resolvers, WebSocket and SSE, response caching, workspaces, and environment variables.