UD5 Toolkit
Random Yes No Decision Wheel - Online Spinner with Sound
Spin a colorful wheel that lands on Yes, No, or custom answers. Includes sound effects and adjustable probability. Local fun decision maker.
Random Animal Soundboard - Online Hear Real Calls
Random Animal Soundboard
Click any animal or hit "Random" to hear real animal calls from around the world!
Frequently Asked Questions
It’s a free online tool that lets you listen to authentic animal calls at the click of a button. You can choose a specific animal or let the randomizer surprise you. Perfect for education, entertainment, or just a moment of joy.
Yes! All sounds come from public domain recordings on Wikimedia Commons, capturing genuine animal vocalizations. No synthetic audio – only real calls from dogs, cats, birds, and more.
Simply click on any animal card to play its sound. Use the "Random Animal Sound" button to let the board pick one for you. You can adjust the volume with the slider. Click an active card again to pause/resume.
Absolutely. The layout is fully responsive and touch-friendly. All sounds play with a single tap, making it a great companion on any device.
Browsers require at least one user interaction (like a click) before allowing audio playback. If you’ve already clicked on the page, sounds will play instantly. If you experience issues, try clicking any button again.
Speech Recognition Tester - Online Web Speech API Demo
Test your browser's built‑in speech recognition. Speak and see the transcribed text appear live. Must‑have for voice app devs.
Audio Waveform Visualizer - Online See Your Sound
Visualize audio in real time from your microphone or uploaded audio file. See the waveform dance. Uses Web Audio API locally.
Audio Visualizer Bars - Online Live FFT Spectrum
Play an audio file or use mic to see real‑time frequency bars. Choose colors. Great for music videos. Canvas.
Speech Utterance Tester - Online Play Word by Word
Hear text spoken word by word with boundary events. See the exact index and character. Advanced TTS dev tool.
Speaker Test Tones - Online Left/Right Channel & Sweep
Play left‑only, right‑only, and frequency sweeps to test your speakers or headphones. Quick audio check.
Online Guitar Tuner - Browser Microphone Pitch Detection
Tune your guitar using the browser microphone. Detects pitch and shows deviation from standard tuning. No installation, pure client-side audio processing.
Speech Dispatcher Tester - Online Explore All Voices
List all available TTS voices on your system. Test each with any text. Adjust rate and pitch. Find the best voice.
HTML Audio Visual Emphasis - Online Highlight Spoken Words
Combine TTS with text highlighting. See each word colored as it is spoken. For e‑learning content creation. Local.
Random Quarterly OKR - Online Corporate Fun
Create a random, aspirational quarterly objective with unrealistic key results. For meeting icebreakers.
Meeting Speaker Timer - Online Countdown Per Agenda Item
Set a list of agenda items with allocated minutes. Advance through speakers and see remaining time visually. Keep meetings on track.
Speech Timer – Online Practice Presentations with WPM
Paste your speech, set time limit, and practice with a pacing indicator (words per minute). Refine delivery.
Random User Agent String Generator - Online for Testing
Generate a realistic, random user‑agent string for desktop, mobile, or bot. Perfect for API testing and scraping.
Online Metronome with Subdivisions - Precise Rhythm Trainer
Play a metronome with adjustable BPM, time signature, and subdivisions (eighth, triplet, sixteenth). Tap tempo and visual flash. Works offline for practice.
Coin Toss Probability Demonstrator – Online Long‑Run Simulator
Virtual flip coins thousands of times and see the heads/tails ratio converge to 50%. Interactive law of large numbers.
DOM Event Inspector - Online See All Event Listeners
Click any element on a demo page and see which events are attached. Visual debugger for event handling.
Baby Feeding Log - Online Track Breast & Bottle Patterns
Record feeding times, side (left/right for nursing) or oz for bottle. Track daily patterns. Data stays in your browser. Simple newborn helper.
Web Component Slot Demo - Online Shadow DOM Playground
Create a custom element with named slots and see content projection in action. Learn Web Components basics.
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.
Online Metronome - Precise Beats per Minute & Time Signature
A precise online metronome with adjustable BPM, beat emphasis, and time signature. Works offline. Essential for musicians.
Random Encouragement Generator - Online Cheer Up Words
Click for a warm, encouraging sentence to lift your spirits or support a friend. Small positive boost. No repeats.
Random Sentence from Corpus - Online Paste & Generate
Paste your own text and generate a random sentence that mimics its style. Use for creative writing prompts or testing. Fully local.
:focus‑visible Tester - Online Keyboard‑Only Focus Ring
Compare :focus and :focus‑visible styling. See which one applies when using mouse vs. keyboard. Accessible focus management.
User Agent Parser - Online Browser & OS Detector
Paste a user agent string to get a human-readable breakdown of browser, operating system, and device. See your own current agent info automatically.
Virtual Flashlight - Online Color & Strobe Screen
Turn your browser screen into a full‑color flashlight or strobe. Adjust brightness and color. Simple utility.
Web USB Console - Online Claim & Talk to USB Device
Request a USB device and communicate with it using the Web USB API. See vendor and product IDs. Experimental.
Plant Watering Reminder - Online Houseplant Care Scheduler
Set watering schedules for multiple plants with visual alerts. Shows which plants need water today based on last watered date. Data stored locally.
Browser Screen Recorder - Online Record Tab & Download WebM
Record your screen, window, or tab with audio directly in the browser. Download the recording as a WebM file. No upload.
Browser Screen Recorder - Online Record Tab & Download WebM
Record your screen, window, or tab with audio directly in the browser. Download as WebM. No extension required.
Secret Santa Generator - Online Pair Randomizer with Exclusions
Assign Secret Santa pairings from a list of names with spouse/partner exclusions. Optionally email results via mailto link. Fully local, no server.