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.
UD5 Toolkit
Click any animal or hit "Random" to hear real animal calls from around the world!
Spin a colorful wheel that lands on Yes, No, or custom answers. Includes sound effects and adjustable probability. Local fun decision maker.
Test your browser's built‑in speech recognition. Speak and see the transcribed text appear live. Must‑have for voice app devs.
Visualize audio in real time from your microphone or uploaded audio file. See the waveform dance. Uses Web Audio API locally.
Play an audio file or use mic to see real‑time frequency bars. Choose colors. Great for music videos. Canvas.
Hear text spoken word by word with boundary events. See the exact index and character. Advanced TTS dev tool.
Play left‑only, right‑only, and frequency sweeps to test your speakers or headphones. Quick audio check.
Tune your guitar using the browser microphone. Detects pitch and shows deviation from standard tuning. No installation, pure client-side audio processing.
List all available TTS voices on your system. Test each with any text. Adjust rate and pitch. Find the best voice.
Combine TTS with text highlighting. See each word colored as it is spoken. For e‑learning content creation. Local.
Create a random, aspirational quarterly objective with unrealistic key results. For meeting icebreakers.
Set a list of agenda items with allocated minutes. Advance through speakers and see remaining time visually. Keep meetings on track.
Paste your speech, set time limit, and practice with a pacing indicator (words per minute). Refine delivery.
Generate a realistic, random user‑agent string for desktop, mobile, or bot. Perfect for API testing and scraping.
Play a metronome with adjustable BPM, time signature, and subdivisions (eighth, triplet, sixteenth). Tap tempo and visual flash. Works offline for practice.
Virtual flip coins thousands of times and see the heads/tails ratio converge to 50%. Interactive law of large numbers.
Click any element on a demo page and see which events are attached. Visual debugger for event handling.
Record feeding times, side (left/right for nursing) or oz for bottle. Track daily patterns. Data stays in your browser. Simple newborn helper.
Create a custom element with named slots and see content projection in action. Learn Web Components basics.
Register a service worker, subscribe to push, and send a test notification using a VAPID key pair. Step‑by‑step demo.
A precise online metronome with adjustable BPM, beat emphasis, and time signature. Works offline. Essential for musicians.
Click for a warm, encouraging sentence to lift your spirits or support a friend. Small positive boost. No repeats.
Paste your own text and generate a random sentence that mimics its style. Use for creative writing prompts or testing. Fully local.
Compare :focus and :focus‑visible styling. See which one applies when using mouse vs. keyboard. Accessible focus management.
Paste a user agent string to get a human-readable breakdown of browser, operating system, and device. See your own current agent info automatically.
Turn your browser screen into a full‑color flashlight or strobe. Adjust brightness and color. Simple utility.
Request a USB device and communicate with it using the Web USB API. See vendor and product IDs. Experimental.
Set watering schedules for multiple plants with visual alerts. Shows which plants need water today based on last watered date. Data stored locally.
Record your screen, window, or tab with audio directly in the browser. Download the recording as a WebM file. No upload.
Record your screen, window, or tab with audio directly in the browser. Download as WebM. No extension required.
Assign Secret Santa pairings from a list of names with spouse/partner exclusions. Optionally email results via mailto link. Fully local, no server.