OpenAPI Viewer vs RESTful API Client

OpenAPI Viewer is the easiest way to explore, test, and understand OpenAPI 3.0 and 3.1 specifications on your Apple devices. Whether you're integrating a third-party API, reviewing your team's documentation, or testing endpoints on the go, OpenAPI Viewer gives you a clean, native interface built for developers. EXPLORE YOUR API Open any JSON or YAML OpenAPI file and instantly browse all endpoints organized by tag. Search across operations, schemas, parameters, and examples in seconds. View rich documentation for every endpoint — including descriptions, parameters, request bodies, and responses — with schema constraints, validation rules, and example values displayed clearly. TRY IT OUT Send real HTTP requests directly from the app. Fill in path, query, header, and cookie parameters, provide a request body, configure authentication, and hit Send. View the response body, status code, duration, and validation results — all without leaving the app. EXPORT AND SHARE Copy any request as a cURL command, JavaScript fetch, Swift URLSession, or Python httpx snippet — ready to paste into your terminal or codebase. BUILT FOR APPLE PLATFORMS A thoughtfully designed native UI makes even complex, sprawling APIs easy to read. Color-coded methods, clear badge indicators, and structured layouts — built for Apple platforms from the ground up. FREE TO USE OpenAPI Viewer is completely free with no subscriptions or paywalls. If you find it useful, you can support development through an optional tip jar — entirely your choice. KEY FEATURES • Open JSON and YAML OpenAPI 3.0 and 3.1 specifications • Browse endpoints by tag with HTTP method filters • Full-text search across operations, schemas, examples, and headers • Send real HTTP requests with a built-in inspector • Configure Bearer, API key, Basic, and OAuth credentials • Request history • Copy requests as cURL, fetch, URLSession, or httpx • Schema viewer with constraints, enums, and examples • Native on iPhone, iPad, and Mac

RESTfull API is a fast, secure, and powerful REST API client built for developers. Test, debug, and explore your API endpoints directly from your device—without depending on cloud-based API testing services. Whether you're working with REST APIs, microservices, or backend integrations, RESTfull API helps you streamline API development while keeping your projects and data stored locally. Features * Import and browse **OpenAPI 3.x (Swagger)** specifications. * Test **REST API** endpoints with support for custom HTTP headers. * Configure reusable global (site) headers and endpoint-specific headers. * Securely store API definitions locally on your device. * Save and organize API requests for quick access and reuse. * Store API responses locally for debugging, testing, and documentation. * Automatically combine global headers with endpoint headers for every request. * Designed for offline use, giving you complete control over your API data. Perfect For * API Developers * Backend Developers * Mobile Developers * Web Developers * DevOps Engineers * QA Engineers * Software Testers RESTfull API is a lightweight, privacy-focused API testing tool that helps you inspect, debug, and manage REST APIs efficiently. Keep your API collections, requests, and responses on your device while enjoying a fast and reliable development workflow. REST API, API Client, OpenAPI, Swagger, REST Client, HTTP Client, API Testing, JSON, Backend Development, Web Services, Developer Tools, API Debugging, RESTful API, HTTP Requests.