UD5 Toolkit
prefers‑contrast Tester - Online High/Low Contrast Emulator
Force more or less contrast and see how your page adapts. Test your CSS media queries for accessibility.
Touch Event Visualizer - Online Multitouch Debugger
Touch Event Visualizer
Online Multitouch Debugger – inspect touchstart, touchmove, touchend with real‑time feedback
Touch Area
Active Touches
No active touches
Event Log
Awaiting touch events...
Frequently Asked Questions
This Touch Event Visualizer helps developers debug multitouch interactions in real time. It logs every
touchstart, touchmove, touchend, and touchcancel event, displays active touch points with coordinates, force, and radius, and visualizes movement paths on a canvas. Useful for testing gestures, games, or any touch‑driven interface.Yes! Enable the Mouse simulation switch above the canvas. Then click and drag on the touch area to simulate a single finger. This lets you quickly prototype touch logic even on a laptop or desktop computer. For full multitouch testing we recommend using a real device or Chrome DevTools’ device mode with touch emulation.
The canvas sets
touch-action: none to prevent default scrolling/zooming while you interact. If you experience scrolling, make sure you’re touching inside the gray‑bordered canvas area. The rest of the page still scrolls normally.Force (0–1) indicates the pressure of the touch, supported on devices with 3D Touch or similar hardware. RadiusX / RadiusY (in pixels) describe the size of the contact ellipse between the finger and the screen. These values are displayed in the Active Touches panel when available.
JWT Debugger - Online JSON Web Token Decoder & Verifier
Decode the header and payload of a JSON Web Token (JWT) without verifying the signature. Inspect claims securely on the client side. Great for developers.
Miniature Contrast Painter – Online View Zenithal Highlight & Wash
Simulate zenithal priming and contrast/speed paints over a 3D bust. Understand light and shadow placement before you paint. Great for tabletop miniatures.
Web Performance Checklist - Online Quick Audit
Answer questions about your page (image size, caching, fonts) and get a tailored list of optimization tips. Manual audit helper.
Personal Values Sorter – Online Discover Your Top 5
Choose from a list of 50 values and narrow down to your top 5. Understand what drives you. Private.
Reading Log – Online Track Minutes & Books Completed
Simple interface for kids to log reading minutes and pages. Add book titles. Print weekly report. Local.
Contact Picker API Demo - Online Select & Read Contacts
Pick a contact from the device’s address book (mobile). Read name, email, and phone. All permission‑based. Privacy safe.
Highlighted Text Extractor – Online Gather Citations From Web
Paste text with highlights (e.g., from Apple Books) and extract only the highlighted lines. Save as list.
UV Index Lookup - Online Current Sun Strength by City
Enter a city to get current UV index forecast using open data (with local caching). Understand sun protection needs. No personal location used.
Markdown to Rich Text - Online Copy for Google Docs
Convert Markdown to styled HTML that retains formatting when pasted into Google Docs or Word. Headings, bold, lists. Client‑side.
Permissions Query API Demo - Online Check All APIs
Query the permission state of camera, microphone, geolocation, and more. See the response and learn the API.
Truth Table Generator - Online Boolean Logic Worksheet
Select logical operators (AND, OR, XOR, NAND) and generate a complete truth table. Handy for digital logic.
VIA Character Strengths Generator - Online Positive Psychology
Take a lighthearted inventory of your character strengths (not official VIA). Self-reflection tool. All in browser.
Ideal Weight Chart - Online BMI & Health Range Guide
See the healthy weight range for your height using standard BMI chart. Gender‑specific data. Quick reference.
Text Alignment Tool - Online Left/Center/Right/Justify
Paste text and align it left, center, right, or fully justify by inserting spaces. Simple formatting helper. Pure browser.
JSON Duplicate Key Checker – Online Find Repeated Keys
Paste JSON and instantly see if any object has duplicate keys. Quick syntax spotter.
Compliment Generator - Online Positive & Kind Words
Click for a warm, quirky compliment to brighten someone's day. Great for social media and morale boosting.
Hashid Encoder/Decoder - Online Short Unique IDs from Numbers
Convert integers into short, unique, YouTube‑style IDs (hashids) and decode them back. Customize salt and minimum length.
Random Book Title Generator – Online Fiction & Non‑Fiction Ideas
Generate a random book title with a subtitle. Good for writing prompts or just for laughs.
Browser Console Simulator - Online Practice JavaScript Logging
Type JavaScript expressions and see output like a real browser console. Supports console.log, error, warn. Use for quick testing without DevTools.
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.
revert‑layer & @layer Debugger - Online Visual Specificity
Set up multiple @layers and use revert‑layer to fall back. See the computed style and cascade resolution live.
Web Push Debugger - Online Inspect Subscription & Events
See your current push subscription details. Trigger push and notificationclick events manually to debug.
Touch Gesture Recognizer - Online Detect Swipe, Pinch, Rotate
Perform gestures on a canvas and see them detected in real time. Logs swipe direction, pinch scale, and rotate angle.
Event Schema Markup Generator - Online JSON‑LD for Concerts
Build a complete Event structured data with performer, location, and dates. Get Google‑ready JSON‑LD for tickets.
Touch Pressure & Radius Visualizer - Online Advanced Input
Touch your screen and see the pressure and radius reported. Visualize force. Mobile developer tool.
aria‑describedby Visualizer - Online Check Descriptions
Highlight elements with aria‑describedby and see the linked description text. Verify a11y annotations.
Element Resize Detector - Online Monitor Size Changes
Select any element on the test page and monitor its size changes with ResizeObserver. See log of all entries.
Image Load Event Debugger - Online Test onload/onerror
Load an image and see the exact events fired (load, error, abort). Monitor progress. Dev helper.
FormData to JSON Converter - Online Debug Multipart
Fill in a form and see the FormData object as JSON. Perfect for debugging multipart form submissions. Client-side.