Color Personality Test – Online Fun What Hue Are You?
Answer a few questions and get a playful color-based personality result. For entertainment only.
UD5 Toolkit
Answer a few questions and get a playful color-based personality result. For entertainment only.
Hear a word spoken by browser TTS and type the spelling. Choose difficulty or paste your own list. Great for kids. Local only.
Check if your site has a service worker registered and if it can load offline. Quick PWA readiness assessment.
Practice positive/negative lookahead and lookbehind. See matches highlighted live. Master advanced regex.
Write a function name and get a complete unit test stub with describe, it, and expect. Follows AAA pattern.
Simulate a PWA receiving shared text, links, and images. Test the Web Share Target API without a server.
Register a periodic background sync and see the status. Schedule content updates for your PWA. API demo.
Write a media query and see if it matches as you resize the iframe. Understand width, height, and resolution queries.
List all available TTS voices on your system. Test each with any text. Adjust rate and pitch. Find the best voice.
Log pool depth, flame height, and soot for each wick series. Quickly identify the best wick for your wax and vessel.
Wait for the box to turn green, then tap as fast as possible. Measure milliseconds. Compete with friends.
Paste two strings that look the same and see if they differ after normalization. Debug invisible encoding bugs.
Transform English text into pseudolocalized text with accents, expansion, and brackets. Test your UI's readiness for translation.
Enter a component name and generate a complete RTL test file with render, screen, and common assertions. Fast testing setup.
Enter a URL and view it in three iframes: mobile, tablet, and desktop side‑by‑side. Quick responsive check.
Generate a random first and last name typical for US, UK, or Australia. With optional middle initial. Useful for test data.
Test the Content Indexing API to add a page to the device's content feed. See how your PWA integrates with the OS.
Send HEAD requests to popular websites and measure the round‑trip time. Quick network health check. Client‑side.
Quickly estimate your internet connection speed by downloading a small test file. See class and recommendations.
See your current notification permission status. Request or reset it. Test browser notification behavior.
Hear text spoken word by word with boundary events. See the exact index and character. Advanced TTS dev tool.
Select HTTP method, set headers, and body. Send requests and see the full response. Lightweight Postman alternative.
Measure your visual and auditory reaction speed. Average and best times shown. No data collected. Pure Javascript timing.
Display a Snellen chart on screen and mark distance for a fun self-test. Not a replacement for professional exam.
Create a basic Playwright script with browser launch, page navigation, and screenshot. Start E2E testing instantly.
Override your browser's geolocation to any coordinates and test how your app responds. For development and privacy testing.
Bypass CORS for testing by routing requests through a local service worker proxy. Debug APIs without server changes. Experimental.
Compress text with Brotli at different quality levels. See size reduction and time. Find the sweet spot for your static assets.
Toggle a screen wake lock to prevent the device from dimming or sleeping. See the lock state and learn the API.
Test how your page loads under slow, 3G, or offline conditions by intercepting fetch and applying delays. No DevTools needed.
Simulate forced‑colors mode and see how your site looks. Adjust CSS system colors. Make your design accessible.
Check if your page triggers the beforeinstallprompt event. Simulate the install flow. Debug PWA installability.
Connect to a WebTransport server and exchange data over QUIC. See latency and throughput. Perfect for exploring low‑latency real‑time APIs.
Simulate reduced motion preference and test your animations. Copy the media query snippet. Keep your users safe.
Check if a URL can be embedded in an iframe. Test your site’s defense against clickjacking. Browser‑based.
Check notification permission, request it, and send a test notification. Verify icon, body, and tag. Debug web push.
Check current screen orientation and test the lock API. Useful for mobile web apps. Demo with code.
Connect to a WebSocket endpoint, send messages, and view the stream of received data. Perfect for debugging real‑time apps.
Paste your Accept‑Language header and see which languages your site should serve based on quality values. Internationalization helper.
Test the Fullscreen API: request fullscreen on a colored div, detect changes, and copy the JavaScript boilerplate.
Connect to an SSE endpoint and display events in real time. Inspect event types and data. Handy for frontend devs.
Load a video and visually check if audio aligns with lips. Use frame‑by‑frame stepping. Debug playback issues.
Register a service worker, subscribe to push, and send a test notification using a VAPID key pair. Step‑by‑step demo.
Enter any phrase and instantly see if it's a palindrome, ignoring spaces and punctuation. Fun for word nerds.
Override your browser's geolocation to any coordinates and test how your app responds. For development and privacy testing.
Test the Web Share API by sharing text, links, and files directly from the browser. Check compatibility and see example code.
Check if your browser and display support the wider DCI‑P3 color space. See the difference with a simple test pattern.
Pick a method, URL, headers, and body, then send an HTTP request directly from your browser. Debug APIs easily.
Quickly test if your webcam, microphone, and speakers work correctly. See live video and audio meter. No data sent.
Generate random but realistic‑looking data arrays (users, products, orders) with typos and missing fields. For test robustness.
Simulate random mouse moves, clicks, or keystrokes to test idle‑timeout logic. Stops when you move the mouse. Dev test.
Generate random, formatted ID numbers that match pattern rules for various countries. For testing input validation. No real data.
Simple interactive eye dominance test: hold up a virtual dot and see which eye stays aligned. Educational.
View a series of digital Ishihara‑style plates. Not a diagnostic tool, just educational. Read numbers.
Build an iframe with different sandbox flags and see live which features are blocked. For secure embedding.
Generate valid, random unicast MAC addresses for testing or spoofing. Select OUI prefix if desired. Local only.
See a live VU meter of your microphone's input level. Test if your mic is working and adjust gain. Privacy‑friendly.
Play left‑only, right‑only, and frequency sweeps to test your speakers or headphones. Quick audio check.
Paste a test card number to verify Luhn algorithm, identify issuer (Visa, MC), and check length. No real data.