API Tester 2026: Benefits, Features & Pricing

API Tester is a completely free mobile app available on iOS, Android, macOS and watchOS. It is a free API testing tool with various functions that allow users to do very complex tasks on a small screen. You can explore any type of API on the go: REST, GraphQL, WebSocket, SOAP, JSON RPC, XML, HTTP and HTTPS. All types of HTTP requests are supported: GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS, COPY, LINK, UNLINK, PURGE, LOCK, UNLOCK, PROPFIND and VIEW.

Here you can perform the API calls with any kind of request data encoding and transfer type (query params, URLEncoded params, FormData, raw data, send files from device storage, cloud and remote server). Also, TLS can be skipped, redirects can be disabled and timeouts are adjustable. Weak SSL verification can be enabled and replaced with a self-signed certificate. API Tester allows you to import any collection to the app (Swagger, Postman, YAML, JSON) or import requests using cURL.

There is a powerful GraphQL editor with full-scale experience: body editor with queries, mutations, subscriptions, syntax support, variables editor and documentation. WebSocket testing tool is available that handles connection and message exchange via W...