Web Feature Check vs DevTools+

Discover What the Browser Really SupportsDiscover What the Browser Really Supports Web Feature Check helps developers, testers, and tech-savvy users instantly check which web technologies are supported in the current environment - whether it’s a mobile browser, embedded WebView, or custom in-app browser. Whether you're debugging quirks in mobile Safari or ensuring your web app works in limited environments, this tool gives you instant clarity. Key Features Check Runtime Web Features Detect supported JavaScript APIs, HTML5 elements, CSS features, media codecs, and more - all from the environment itself. Test Browser & WebView Capabilities Identify the exact feature set exposed by any browser, including embedded views and in-app browsers. Designed for Mobile Testing Quickly test on real devices - no desktop emulators, no guesswork. Test Categories and Coverage 1. HTML5 & Media Tests core media-related capabilities: - canvas, video, audio, picture, srcset - WebGL / WebGL2 - Picture-in-Picture 2. Audio & Media Processing Covers modern media and audio APIs: - Web Audio, MediaRecorder, ImageCapture - Web Speech API, Media Capabilities, Web MIDI 3. UX & Notifications Checks interaction and user feedback features: - Notifications, Fullscreen, Page Visibility - Web Share, Badging, Wake Lock, Vibration 4. JavaScript APIs Includes advanced JS platform features: - Service Workers, WebAssembly, Fetch, Streams - Clipboard, Crypto, ES6 Modules, Encoding API 5. Performance & Monitoring Observability & reactivity tools: - Intersection / Resize / Mutation / Performance Observers - Reporting API 6. Navigation & Communication Tests communication between contexts: - History & URL APIs - Beacon, BroadcastChannel, Server-sent Events - WebSockets, MessageChannel, XMLHttpRequest 7. Storage & Files Detects client-side data persistence options: - localStorage, sessionStorage, IndexedDB - File System Access, Cache Storage, File API - StorageManager & usage estimates 8. Input & Interaction Covers input modalities and interactivity: - Touch, Pointer, Drag-and-Drop - Gamepad, Pointer Lock, Viewport API - Selection API 9. Connectivity & Device Access Tests direct hardware or network integration: - WebRTC, Web Bluetooth, USB, Serial - Geolocation, DeviceMotion, Orientation, Battery, Network Info 10. Animation & Graphics Graphics rendering and animation pipelines: - Web Animations, WebGPU, WebCodecs 11. CSS & Layout Modern layout and visual CSS features: - CSS Grid, Flexbox, Container Queries, Subgrid - Backdrop-filter, View Transitions, Font Loading, Typed OM 12. Commerce & Payment E-commerce and data collection: - Payment Request API, Contact Picker 13. Security & Permissions Access and auth-related technologies: - Permissions, WebAuthn, Credential Mgmt, Trusted Types 14. Experimental APIs Emerging technologies still in draft or behind flags: - WebXR, Web NFC, Web Locks, WebTransport - Background Sync, Push API, Idle Detection, Compression Streams Scoring & Reporting - The app gives you a feature support score (e.g. 82/120) - Each category shows how many tests passed - Color-coded badges help you quickly interpret support levels (fully supported vs. unsupported) - Optionally, users can explore each feature’s MDN documentation directly from the interface

496 developer tools, ready on iPhone and iPad. DevTools+ puts everyday code utilities in one searchable app. Format JSON, test APIs, inspect regex, decode JWTs, encode Base64, generate UUIDs, convert timestamps, format SQL, and handle hundreds of other development tasks without jumping between random websites. FIND THE RIGHT TOOL FAST - Search all 496 tools across 29 categories - Pin favorites and reopen recent tools - Start with practical examples - Copy and share results - Keep supported history, snippets, and API work organized FORMAT AND CONVERT - JSON formatter, validator, minifier, tree view, sort, and escape - JSON to YAML, CSV, XML, TypeScript, and Java - XML, YAML, TOML, CSV, Markdown, SQL, and text utilities DECODE AND INSPECT - JWT decoder and analysis tools - Base64 encoder and decoder - URL, HTML, Unicode, hexadecimal, and character encoding tools - Hash, HMAC, password, certificate, header, and security helpers - Timestamp, timezone, cron, MIME type, port, and HTTP status references BUILD AND TEST - API tester and REST, GraphQL, cURL, header, and WebSocket helpers - Regex tester, match highlighter, replace, and reference tools - UUID, random data, mock payload, barcode, and QR generators - Git, CSS, React Native, testing, documentation, file, and log utilities LOCAL-FIRST BY DESIGN Most tools process directly on your device. Tools that need a network connection are clearly identified. Nothing you enter is sent anywhere unless the selected tool requires a network request. NO ACCOUNT REQUIRED Open the app and start working. A useful selection of tools is free. DevTools+ Pro unlocks the complete toolkit and removes ads. Built for developers, QA engineers, API testers, students, and technical teams who want a focused utility on their phone. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/