UD5 Toolkit
ASCII Table - Online Character Code Reference
Interactive ASCII table showing decimal, hex, octal, and binary codes for all standard and extended ASCII characters. A classic programmer reference.
Reference Guides - Cheat Sheets
99+ toolsnpm Version Range Checker - Online SemVer & Tilde Caret
Enter a package name and version range to see all satisfying versions from the registry. Understand ^ and ~.
Polygon Name Finder - Online How Many Sides?
Enter a number of sides (3‑100) and get the correct polygon name (triangle, hectogon). Fun geometry reference.
Electron Configuration Writer - Online Orbital Diagram Tool
Get the full electron configuration and orbital box diagram for any element. Learn the Aufbau principle. Fast and local.
Flame Test Colors - Online Element Identification Chart
Click a metal ion to see the characteristic flame color and wavelength. Useful for analytical chemistry reference.
ISBN Validator - Online Check ISBN‑10 & ISBN‑13
Validate ISBN‑10 and ISBN‑13 numbers and compute their check digits. Useful for booksellers and libraries. All local.
Periodic Table Explorer - Online Element Facts & 3D Model
Browse a beautifully designed periodic table with electron shell visualization and key facts. Click any element to learn more. Offline ready.
Dog Breed Identifier - Online Reference with Pictures
Browse a searchable list of dog breeds with pictures and traits. Find the breed you saw. Static data, fast.
Crypto Price Ticker - Online Live Bitcoin & Ethereum
Live cryptocurrency prices from public APIs. Clean ticker with percentage changes. Pure frontend, no account needed.
Lyrics Finder - Online Song Lyrics Search Tool
Enter a song title and artist to find lyrics using public APIs. Quick preview and copy. A lightweight tool for music lovers.
Hijri to Gregorian Date Converter - Online Islamic Calendar
Convert between Gregorian and Hijri (Islamic) dates. Approximate visual reference. Local algorithm.
Rock Cycle Interactive Diagram - Online Geology Model
Click through the rock cycle to see how each rock type transforms into another. Animated arrows and descriptions.
Solubility Rules Reference - Online Quick Chemistry Table
Classic solubility rules for ionic compounds in water. Determine if a salt is soluble or forms a precipitate. Static guide.
Pi Digits Viewer - Online Scrolling Infinite π
Scroll through thousands of pre‑computed digits of π. Search for a specific string of digits. For math lovers.
F‑Stop Calculator - Online Aperture & Depth of Field Reference
Learn about f‑stops and their effect on light and depth. Calculate equivalent exposure adjustments. Educational.
Easter Date Finder - Online Computus Algorithm for Any Year
Find the date of Easter Sunday for any given year. Learn about the computus algorithm. Simple and accurate.
Air Quality Index Lookup - Online AQI by City
Enter a city name to fetch its current Air Quality Index from public APIs. Color-coded health warning. No login.
Recent Earthquake Tracker - Online USGS Live Data Map
View recent earthquakes worldwide on a map. Fetches public USGS GeoJSON feed directly from browser. Real-time data.
Docker Commands Cheatsheet - Online Quick Reference
A searchable list of essential Docker CLI commands for managing containers, images, and volumes. Copy-paste friendly. Always handy.
Git Cheatsheet - Online Common Commands Reference
Quick reference for frequently used Git commands with examples. Searchable and categorized. A handy resource for all developers.
Emoji Lookup - Online Search & Copy All Emojis
Search the complete emoji set by keyword or code. Click to copy. Includes skin tones and flags. Always up to date with Unicode.
HTML Color Names - Online Complete List with Hex & Preview
A complete, searchable list of all 140+ named HTML/CSS colors with their hex codes and color previews. Click to copy code. Essential web reference.
Week Number Finder - Online ISO Week of Year
Enter any date and get the ISO week number. Also shows start and end of that week. Handy for project planning.
ISS Tracker - Online Live Where is Space Station
See the International Space Station’s current position on a world map in real time. Uses public API. No refresh.
Lunar Phase Predictor - Online Moon Calendar Any Year
View the moon phase for any date in past or future. See full moon dates and eclipses for a given year.
Alphabet of Elements - Online A‑Z by Chemistry Symbol
See all elements sorted alphabetically by symbol. Picture and atomic weight. Beautifully styled static list.
Etymology Quick Lookup - Online Word Origin Reference
Enter an English word to get a brief etymology (Latin, Greek, etc.) and root meaning. From curated static data.
Random Shakespeare Quote Generator - Online Bard's Wisdom
Get a random quote from Shakespeare's works with play and character attribution. Copy in beautiful typography.
pH Scale Explorer - Online Interactive Acid Base Chart
Drag a slider along the pH scale to see examples of solutions at that pH and the concentration of H⁺ and OH⁻ ions.
Color Meaning by Culture - Online Cross‑Cultural Reference
See how a color is interpreted in different cultures (e.g., red in China vs. Western). Crucial for global web design. Static guide.
Leap Year Checker - Online Verify February 29
Enter a year to check if it is a leap year. Shows the rule explanation and next/previous leap years. Simple reference.
International Dialling Code Reverse Lookup - Online Country by Code
Enter a dialling code (+44, +1) to find which country it belongs to. Also search by country name. Static reference.
Constellation Sky Viewer - Online Star Map & Mythology
Click on a constellation to see its star pattern and read the Greek mythology behind it. Beautiful CSS illustration.
Acronym Finder - Online Decode Abbreviations & Slang
Look up common acronyms and abbreviations from a built-in list. Search by acronym or meaning. Always expanding, no internet needed.
Keyboard Shortcuts Viewer - Online Your Browser & OS Keys
Display a dynamic list of keyboard shortcuts for the current browser and operating system. Filter by category. Keep it open for reference.
Country Facts - Online Quick Nation Info & Flag Tool
Look up quick facts about any country: capital, population, currency, flag, and continent. Static data, fast search. Great for travel and education.
Interactive Periodic Table - Online Chemistry Reference
An interactive periodic table of elements with detailed properties, electron configuration, and images. Excellent educational resource. All static data.
HTTP Status Codes Reference - Online Quick Cheat Sheet
A complete reference of HTTP status codes with explanations. Search and filter by code or category. Useful for API developers and web debugging. Static and fast.
Acronym Expander - Online Find What It Stands For
Enter an acronym and see its most common full forms. Static dictionary. No internet needed after load.
Magnetic Declination Estimator - Online Compass Correction
Get the approximate magnetic declination for a given latitude and longitude. Apply correction to your compass.
MIME Type ↔ Extension Lookup - Online Quick Reference
Search by MIME or file extension to see the corresponding type. Helpful when configuring web servers. Static.
Word Origin Dictionary - Online Quick Etymology Lookup
Enter an English word to get a quick etymology. From a curated list of common roots. Learn language history.
Semaphore Flag Translator - Online Signal Code Converter
Translate text into semaphore flag positions and decode semaphore back to letters. Interactive animated flags. For scouts and maritime fans.
Historical Cameras Timeline - Online Photography Evolution
Scroll through an interactive timeline of cameras from camera obscura to modern DSLR. Photos and facts.
Planetary Fact Sheet - Online Solar System Stats
Click a planet to see mass, diameter, moons, temperature, and distance from sun. Beautifully styled static data.
Shutter Speed Cheat Sheet - Online Photography Exposure Reference
Quick reference of common shutter speeds and when to use them (freeze motion, long exposure). Static photographic guide.
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.
Math Symbols Reference - Online Copy & Paste LaTeX
Browse and copy common mathematical symbols, Greek letters, and operators. Includes LaTeX codes for use in documents. Quick reference for students.
Color Name Finder - Online Hex to Name Dictionary
Find the official name of any hex color from the extended color dictionary. Search by name to get the hex code. Handy for CSS and design language.
Baby Name Meanings - Online Quick Meaning & Origin Lookup
Search a name and see its meaning, origin, and popularity. Static name database. For parents‑to‑be.
Birthstone Finder - Online Gem by Month
Select a month and see the modern and traditional birthstones with images and meaning. Classic reference.
Euler's Number Viewer - Online Show Many Digits of e
View thousands of digits of Euler's number (e). Click to copy a block. For math enthusiasts.
Bird Sound Reference - Online Listen & Identify Common Calls
Browse a collection of common bird calls. Play short audio samples to identify birds you hear. Educational static data.
VS Code Shortcuts Cheatsheet - Online Keyboard Shortcuts
Find essential Visual Studio Code shortcuts for Windows, Mac, and Linux. Filter by category. Boost your coding speed with this reference.
Unicode Character Map - Online Browse & Copy Symbols
Browse thousands of Unicode characters, search by name or code, and copy symbols to clipboard. Supports emojis, arrows, and math symbols.
Interactive Regex Cheatsheet - Online Quick Reference
An interactive reference for regular expression tokens. Click a token to see its explanation and example. Learn regex faster.
TCP/UDP Port List - Online Common Service Reference
Searchable table of well‑known TCP and UDP ports with their services. Check 80, 443, 3306, and many more.
SD Card Formatter Types - Online File System Guide
Understand which file system to choose for your SD card based on capacity and device. A quick guide, no actual formatting.
Ethernet Cable Color Code - Online RJ45 T568A/B Wiring
Interactive guide to crimping RJ45 connectors. See the wire order for T568A/B standards. Helpful for DIY network cables.
UV Index Reference - Online Exposure Category & Protection
See the current UV index forecast or enter a value to learn protection needed (SPF, hat, shade). Educational.