OpenAPI Viewer vs BDUI Go

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

BDUI Go opens mobile apps that are described in JSON: their screens, navigation and API requests. Authors create these apps in the BDUI web dashboard and share a link or a QR code. You open it in BDUI Go, and the screens render natively on your iPhone. Each app opens inside BDUI Go, so there is nothing extra to install. When the author publishes an update, you get the new version without reinstalling anything or waiting for an App Store update. A JSON description is data, not code: it lists which components to show and which requests to make. BDUI Go renders it with native Compose Multiplatform components — no webview, no downloaded executables. TRY IT RIGHT AWAY — NO ACCOUNT NEEDED • Component showcase: every building block, rendered live from JSON • Currency rates: live exchange rates from the Frankfurter API, pull down to refresh • Weather: city search and forecasts from the Open-Meteo API • Sign-in demo: an app that signs in to an API and keeps the session fresh automatically More demos with QR codes — a tea shop, a live earthquake feed, a cafe menu — at https://bdui.io HOW IT WORKS 1. An author describes an app in JSON in the BDUI web dashboard and publishes it 2. They share a link or a QR code 3. You open it in BDUI Go — the screens render natively on your iPhone Authors can try changes on a separate test channel before publishing them, and roll back to any earlier version in one click. FEATURES • Native rendering — no webview • Offline cache: previously opened apps launch even without a network • Recents list, with any app pinned as the default one that opens on start • Request controls: authors can limit which hosts an app's API requests may reach • Built-in sign-in support for apps that use an API with tokens • Universal Links: https://bdui.io/a/… opens directly in BDUI Go PRIVATE BY DESIGN No accounts in the app, no ads, no analytics, no tracking. The camera is used only to scan QR codes, entirely on your device. Privacy policy: https://bdui.io/privacy CREATE YOUR OWN Describe an app in JSON — screens, navigation, API requests — publish it and share a link. The web dashboard is in early access: request access at https://bdui.io