Web Feature Check vs BoltKit

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

BoltKit puts 10 essential developer tools in one beautifully crafted app — right on your iPhone and iPad. Everything is completely free. ALL 10 TOOLS — FREE • ChmodCalc — Unix file permissions calculator with interactive checkbox grid, octal and symbolic output, and common presets. • CronBuilder — Build cron expressions visually with field editors, quick presets, human-readable descriptions, and next-run previews. • EpochTime — Convert between Unix timestamps and human-readable dates with a live ticker, bidirectional conversion, and timezone picker. • Base64Lab — Encode and decode Base64 with support for URL-safe variants and automatic input detection. • SubnetCalc — IP subnet calculator with CIDR slider, network/broadcast addresses, usable host range, and binary view. • DNSLookup — Query DNS records via DNS-over-HTTPS using Cloudflare or Google resolvers. Supports A, AAAA, MX, CNAME, TXT, and more. • HTTPCodes — Searchable HTTP status code reference grouped by category — 1xx through 5xx with descriptions and usage notes. • JSONPretty — Format, validate, and minify JSON with syntax highlighting and a collapsible tree view. • RegexLab — Test regex patterns with live matching, capture group extraction, flag toggles, and a library of common examples. • JWTInspect — Decode and inspect JWT tokens — view header, payload, signature, algorithm, and expiry status at a glance. Every tool includes unlimited saves, full history, and export/share — no limits, no paywalls, no in-app purchases. PRIVACY FIRST BoltKit runs entirely on your device. No accounts, no tracking, no analytics, no data collection. Your data never leaves your iPhone or iPad. Built with Apple's Liquid Glass design for iOS 26. Zero third-party dependencies. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://boltkit.app/privacy-policy.html Terms of Service: https://boltkit.app/terms-of-service.html