UD5 Toolkit
Online Hearing Test – Frequency Pitch Perception
Play pure tones at various frequencies to estimate your hearing range. Simple and educational.
Decision Roulette - Online Spinning Wheel with Sound
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📖 Frequently Asked Questions
The Decision Roulette Wheel is a free online tool that helps you make random decisions by spinning a customizable wheel. Simply add your options, click SPIN, and let the wheel decide for you! Perfect for choosing restaurants, weekend activities, or settling friendly debates.
You can easily customize options by: (1) typing in the input field and clicking the button, (2) clicking the Batch Edit button to paste multiple options (one per line), (3) using one of our preset templates like "Dinner" or "Yes/No/Maybe", or (4) clicking the icon on any option tag to remove it.
Yes! The wheel uses a cryptographically secure random number generator (via
crypto.getRandomValues) to determine the final stopping position. Combined with a variable spin duration and rotation count (5-8 full rotations plus a random offset), each outcome is genuinely unpredictable and fair.
Absolutely! The Decision Roulette Wheel is fully responsive and works beautifully on smartphones and tablets. The wheel automatically resizes to fit your screen, and all controls remain easily accessible with touch-friendly buttons. No app download required – just open in your mobile browser.
The wheel features realistic tick-tick spinning sounds that slow down as the wheel decelerates, plus a celebratory chime when the result is revealed. You can easily toggle sound on/off by clicking the speaker icon next to the SPIN button. Sound is generated using the Web Audio API with no external files needed.
You can add between 2 and 20 options to the wheel. With 2 options, it works like a coin flip. With 20 options, you get a colorful multi-segment wheel. For best visual results, we recommend 4-12 options. The font size automatically adjusts to keep all labels readable.
No data is collected or shared. Everything runs entirely in your browser. Your options, spin history, and preferences are stored only in your browser's local storage for convenience. You can clear history anytime with one click. We use no cookies, no trackers, and no analytics scripts.
Our Decision Roulette stands out with: (1) Realistic physics-based deceleration animation, (2) Authentic tick sounds that slow with the wheel, (3) True randomness via crypto API, (4) Beautiful modern UI with smooth animations, (5) Handy preset templates, (6) Full mobile responsiveness, and (7) Complete privacy – no ads, no tracking.
Reaction Time Test - Online Click & Sound
Measure your visual and auditory reaction speed. Average and best times shown. No data collected. Pure Javascript timing.
Upside Down Text Generator - Online Flip & Reverse Letters
Write upside down text using Unicode flipped characters. Copy and paste to surprise friends. Completely frontend and instant.
Touch Pressure & Radius Visualizer - Online Advanced Input
Touch your screen and see the pressure and radius reported. Visualize force. Mobile developer tool.
Rhyme Finder - Online Dictionary of Rhyming Words
Enter a word and get a list of perfect and near rhymes. Categorized by syllable count. Useful for songwriting and poems. Static data, local.
Pronounceable Password Generator - Online Easy to Say
Create secure passwords that look like gibberish words but are easy to pronounce and remember. Mix of syllables. Local generation.
Pronounceable Random Password - Online Secure & Readable
Create a random long password that alternates consonants and vowels to mimic a pronounceable word. XKCD meets CVCV. Local.
Tap Tempo BPM Detector - Online Find Beats Per Minute
Tap any key to measure beats per minute. Displays average BPM and beat interval in milliseconds. Essential for DJs and music production. No extra permissions.
Keyboard Layout Tester - Online Visual Key Press Viewer
Press any key and see it light up on a standard QWERTY layout. Check functionality or demonstrate shortcuts.
Online BPM Tapper - Tap to Find Beats Per Minute
Tap any key to the beat of a song and the tool calculates the BPM. Also shows average and millisecond delay for loops.
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.
Bcrypt Hash Generator - Online Password Hashing Tool
Generate a bcrypt hash from a password with configurable salt rounds. Verify a password against a hash. Entirely client‑side.
Coding Interview Timer - Online LeetCode Practice Clock
Set a 20, 30, or 45‑minute countdown to simulate a technical interview. Hidden/unhidden. Boost your prep.
Raccoon‑Proof Trash Can Securing Guide – Online DIY
Select your bin type and get a custom instruction on securing it with bungees, straps, or locks.
Screen Wake Lock Tester - Online Keep Screen On
Toggle a screen wake lock to prevent the device from dimming or sleeping. See the lock state and learn the API.
Wake Lock API Tester - Online Prevent Screen Sleep
Request and release a screen wake lock to keep the device awake. See the lock state in real time. Perfect for recipes or presentations.
Password Strength Story - Online Visual Narrative
Evaluate password strength through a short interactive story where each character set adds lines to a narrative. Educational fun.
Weak Password Dictionary Check - Online Top 10k List
Compare your password against a built‑in list of the 10,000 most common passwords. Instant warning if it appears.
Priority Matrix Tool – Online Eisenhower / Impact Effort Grid
Drag tasks into a 2x2 grid (Urgent vs. Important or Impact vs. Effort). Visual decision aid. Local.
Random Name Picker - Online Wheel for Raffles & Giveaways
Enter a list of names and spin a wheel to pick a random winner. Remove picked names to avoid duplicates. Perfect for classrooms or contests.
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.
Weighted Decision Coin Flip - Online Bias % Customizable
Flip a coin with adjustable bias (e.g., 70% heads). Used for random decision-making when you want to gently influence outcomes. History & stats shown.
Color to Emotion Visualizer - Online Interactive Wheel
Click colors on an interactive wheel and see the common emotions and meanings associated with them. A design resource.
HSV Color Picker - Online Traditional Hue Wheel
Classic HSV color wheel with sliders. See hex, RGB, and HSL equivalents. Intuitive for artists. No server interaction.
CSS Loader Generator - Online Animated Spinner Code
Choose from a dozen pure CSS loading spinners. Customize color, size, and speed. Copy the HTML & CSS. No JavaScript needed.
Pairwise Comparison Tool - Online Rank Options Head‑to‑Head
Compare options two at a time and get a final ranking. Systematic way to choose a vacation spot or project.
Decision Matrix Generator - Online Weighted Choice Tool
Enter options and criteria with weights, and see a ranked table of the best choice. Quantitative decision making.
Random Yes/No Button - Online Simple Decision Maker
A giant Yes/No button that gives a random answer with a satisfying animation. The simplest decision helper ever.
Pros & Cons List Maker - Online Decision Helper
Create a weighed pros and cons list with a score. Help make tough decisions. Data saved locally.
Random Decision Maker - Online Yes or No & Wheel
Can’t decide? Use a coin flip, yes/no randomizer, or a customizable wheel. Multiple fun methods to break analysis paralysis. Pure browser fun.