UD5 Toolkit
Voice Pitch Detector - Online Live Mic Frequency
See the fundamental frequency (pitch) of your voice in real time using auto‑correlation. For singers and speech training. No upload.
Speech Dispatcher Tester - Online Explore All Voices
Speech Dispatcher Tester
Explore all available text-to-speech voices in your browser
Speech Controls
Loading voices...
Available Voices
No voices detected. Your browser might not support Speech Synthesis or voices haven't loaded yet.
Frequently Asked Questions
It's an online tool that lets you explore every text-to-speech (TTS) voice available in your browser via the Web Speech API. You can test different voices, adjust pitch, rate, and volume, and even listen to all voices sequentially.
Modern versions of Chrome, Edge, Firefox, Safari, and Opera support the Web Speech API. Some older versions or mobile browsers might have limited voice availability. For best results use the latest Chrome or Edge.
First, ensure your browser supports Speech Synthesis. Voices are loaded asynchronously; try clicking "Speak" once to trigger voice loading. On some operating systems you may need to install additional language packs. If you're on mobile, check your system TTS settings.
Yes, most voices are built into the operating system and work offline. However, some browsers (like Chrome) may use remote voices that require an internet connection. Local voices from your OS will always be available.
Speech Dispatcher is a server process in Linux that provides a common interface to speech synthesis. This online tool emulates the idea by letting you dispatch speech requests to various system voices through your browser.
Use the sliders in the control panel to set rate (speed), pitch, and volume. The values are applied to the currently selected voice. You can test immediately by clicking “Speak”.
The Web Speech API does not support direct audio export. However, you can use browser extensions or screen recording software to capture the synthesized speech if needed.
Vocal Pitch Monitor & Tuner - Online Real‑Time Frequency
Sing or play an instrument into the mic and see the detected pitch on a real‑time chromatic tuner. Use for practice or ear training.
Fake User Persona Generator - Online UX Placeholder
Create a realistic‑looking user persona card with a name, photo placeholder, quote, and demographics. Perfect for design projects.
IBAN Structure Checker - Online Validate Format & Country
Check if an IBAN has the correct length and structure for its country. Early validation, no bank connection.
ETag & Last‑Modified Validator - Online Check Cache Headers
Send conditional requests to a URL and verify that the server correctly handles ETag and If‑None‑Match. Audit caching.
GeoJSON Validator - Online Check Geometry & Properties
Paste a GeoJSON object and validate its structure. Catch missing coordinates, wrong types, and feature errors. Local.
.htaccess Validator - Online Check Syntax
Paste your .htaccess rules and check for common syntax errors or misconfigurations. No server required; static analysis.
Playwright Test Skeleton - Online Script Boilerplate
Create a basic Playwright script with browser launch, page navigation, and screenshot. Start E2E testing instantly.
Periodic Background Sync Tester - Online Register & Test
Register a periodic background sync and see the status. Schedule content updates for your PWA. API demo.
Geolocation Override Tester - Online Simulate Any Location
Override your browser's geolocation to any coordinates and test how your app responds. For development and privacy testing.
Audio/Video Sync Tester - Online Lip Sync Check
Load a video and visually check if audio aligns with lips. Use frame‑by‑frame stepping. Debug playback issues.
PWA Install Prompt Tester - Online Simulate Install
Check if your page triggers the beforeinstallprompt event. Simulate the install flow. Debug PWA installability.
Accept‑Language Header Visualizer - Online Locale Match
Paste your Accept‑Language header and see which languages your site should serve based on quality values. Internationalization helper.
X‑Frame‑Options Tester - Online Clickjacking Defense
Check if a URL can be embedded in an iframe. Test your site’s defense against clickjacking. Browser‑based.
Push Notification Tester - Online Generate & Receive
Register a service worker, subscribe to push, and send a test notification using a VAPID key pair. Step‑by‑step demo.
Web Notification Tester - Online Permission & Display
Check notification permission, request it, and send a test notification. Verify icon, body, and tag. Debug web push.
Geolocation API Simulator - Online Test Coordinates
Override your browser's geolocation to any coordinates and test how your app responds. For development and privacy testing.
Screen Orientation API Tester - Online Lock & Check
Check current screen orientation and test the lock API. Useful for mobile web apps. Demo with code.
Fullscreen API Tester - Online Request & Exit Demo
Test the Fullscreen API: request fullscreen on a colored div, detect changes, and copy the JavaScript boilerplate.
Web Share API Tester - Online Demo & Code
Test the Web Share API by sharing text, links, and files directly from the browser. Check compatibility and see example code.
TTS Reader with Word Highlight - Online Speak & Read Along
Paste any text and have it read aloud while each spoken word is highlighted. Improve reading focus. Web Speech API.
Browser Color Gamut Test - Online P3 or sRGB?
Check if your browser and display support the wider DCI‑P3 color space. See the difference with a simple test pattern.
Palindrome Tester - Online Phrase Checker
Enter any phrase and instantly see if it's a palindrome, ignoring spaces and punctuation. Fun for word nerds.
Fake ID Number Generator - Online Test SSN/SIN Lookalike
Generate random, formatted ID numbers that match pattern rules for various countries. For testing input validation. No real data.
HTTP Request Composer - Online Build & Send Requests
Pick a method, URL, headers, and body, then send an HTTP request directly from your browser. Debug APIs easily.
Media Device Tester - Online Check Camera, Mic & Speaker
Quickly test if your webcam, microphone, and speakers work correctly. See live video and audio meter. No data sent.
Fuzzy Data Generator - Online Create Random Records
Generate random but realistic‑looking data arrays (users, products, orders) with typos and missing fields. For test robustness.
Speech Synthesis Demo - Online Text to Voice with Controls
Write text and pick a voice, rate, and pitch to test your browser's speech synthesis capabilities. No download.
Eye Dominance Test - Online Find Your Dominant Eye
Simple interactive eye dominance test: hold up a virtual dot and see which eye stays aligned. Educational.
Clinical Color Blindness Tester - Online Ishihara Plate Style
View a series of digital Ishihara‑style plates. Not a diagnostic tool, just educational. Read numbers.