UD5 Toolkit
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.
Reaction Time Test - Online Click & Sound
Reaction Time Test
Online click & sound reflex measurement ā accurate and instant
Click or tap to start
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Average
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Best
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Recent Results
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Frequently Asked Questions
A reaction time test measures how quickly you respond to a stimulus. In our tool, you can test visual reaction (screen color change) or auditory reaction (sound beep). It's used in sports, gaming, and cognitive research.
Average visual reaction time is around 200ā250 milliseconds. Auditory reactions are typically faster, around 150ā200 ms. Factors like age, fatigue, and practice can influence your score.
Regular practice, staying hydrated, getting enough sleep, and reducing distractions can improve reaction speed. Physical exercise and cognitive training games also help.
The test uses highāresolution timestamps and Web Audio API for precise beep timing. However, device latency (screen, Bluetooth headphones) can add a few milliseconds. For best results, use wired accessories and a fast device.
Speech Timer ā Online Practice Presentations with WPM
Paste your speech, set time limit, and practice with a pacing indicator (words per minute). Refine delivery.
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.
:focusāvisible Tester - Online KeyboardāOnly Focus Ring
Compare :focus and :focusāvisible styling. See which one applies when using mouse vs. keyboard. Accessible focus management.
Speech Recognition Tester - Online Web Speech API Demo
Test your browser's builtāin speech recognition. Speak and see the transcribed text appear live. Mustāhave for voice app devs.
Speech Length Estimator ā Online Words to Minutes
Paste your script and get an approximate speech duration based on slow/average/fast pace. Avoid overtime.
Spelling Test Practice - Online Audio Dictation & Typing
Hear a word spoken by browser TTS and type the spelling. Choose difficulty or paste your own list. Great for kids. Local only.
Signal Mirror Practice Simulator ā Virtual Aiming Flash
Learn to aim a signal mirror by aligning a virtual finger and target. Simulates the retroāreflective mesh technique. Practice before you need it.
RSVP Speed Reading Trainer ā Online Flash Words
Paste text and set display speed for Rapid Serial Visual Presentation. Train your reading speed.
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.
Ovulation & Fertility Window Calculator - Online Cycle Tracker
Estimate ovulation day and fertility window from last menstrual period. Displays probable conception dates. Informational only; processes locally in browser.
Developmental Milestones Quiz ā Online Ages & Stages Fun
Answer questions and see typical milestones for 0-5 years. Educational reference for parents. Not a diagnostic tool.
Event Countdown Timer - Online Days Until Birthday Wedding Vacation
Set any future date and see a live countdown in days, hours, minutes, seconds. Fun animated display. Save multiple countdowns locally.
Laser Pointer Play Session Timer for Cats
Start a 10ā15 minute guided laser chase session that ends with the dot landing on a treat, preventing frustration from never catching the prey.
Browser Feature Support Detector - Online Check Your Device
See a comprehensive table of which modern web APIs your current browser supports. Includes WebGPU, AVIF, and more.
Voice Memo Recorder - Online Record & Download Audio
Record audio directly from your microphone and download it as a WAV file. Perfect for quick notes. No upload, fully offline support.
Sound Wave Extractor - Online Isolate Vocals or Instrumental
Simple phase cancellation tool: load a stereo track and attempt to remove centerāpanned vocals. Not perfect, but fun to experiment.
Speech to Text Dictation - Online Transcribe Audio & Mic
Use your microphone to dictate text and see it appear live. Also upload an audio file for transcription (limited). All local.
Speech to Text Dictation - Online Transcribe Audio & Mic
Use your microphone to dictate text and see it appear live. Also upload an audio file for basic transcription. All local.
Sobriety Counter & Milestones - Online Recovery Tracker
Track days of sobriety with a motivational counter and milestone celebrations. Set quit date and see time elapsed in days, hours, minutes. Private & local.
Simple Water Tracker - Online Click Glass Count
Tap a glass icon each time you drink a cup of water. See your daily intake. Reminders optional. Local storage.
Cast & Bandage Shower Timer ā Online Waterproof Cover Check
Timer to remind you to limit shower water exposure even with a cast cover. Keep your cast dry.
Potty Training Log ā Online Record Accidents & Successes
Simple tracker to record potty attempts, successes, accidents. See patterns. Data stays local. Aids in toilet training journey.
Random User Agent String Generator - Online for Testing
Generate a realistic, random userāagent string for desktop, mobile, or bot. Perfect for API testing and scraping.
HTML Minifier Comparison - Online See Savings Live
Paste HTML and see a before/after comparison of minified output. Check the byte savings. All local.
Virtual Flashlight - Online Color & Strobe Screen
Turn your browser screen into a fullācolor 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.
PX to EM/REM Converter - Online Responsive Unit Calculator
Convert pixel values to em and rem units based on a base font size. Bidirectional. Mustāhave for frontāend developers.
caretācolor CSS Demo - Online Colorful Text Cursors
Change the text input cursor color. See the effect live. Copy the minimal CSS. Simple but delightful.
Robots.txt Validator & Parser - Online Check Syntax
Paste robots.txt content and parse it to check validity, find disallowed paths. Educational SEO tool. Local processing.