68

npm Version Range Checker - Online SemVer & Tilde Caret

Enter a package name and version range to see all satisfying versions from the registry. Understand ^ and ~.

Developer Tools checker npm range semver

58

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.

Developer Tools ASCII character code reference table

47

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.

Reference acronym expand lookup meaning

47

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.

Educational flags semaphore signal translator

46

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.

Educational 3D chemistry elements periodic table

44

Knot Strength Efficiency Guide – Online Visual Weakness Chart

Compare common knots by their efficiency percentage and residual strength. Interactive chart with animated diagrams.

Outdoors & Survival efficiency knot strength

42

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.

Multimedia lyrics music search song

41

Flame Test Colors - Online Element Identification Chart

Click a metal ion to see the characteristic flame color and wavelength. Useful for analytical chemistry reference.

Educational chemistry colors elements flame test

41

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.

Photography aperture calculator f-stop photography

40

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.

Educational algorithm computus date Easter

39

Bruise Color Timeline – Online Reference Healing Stages

Visual chart showing the typical colors a bruise goes through from red to yellow. Educational only.

Health & Wellness bruise healing timeline

39

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.

Reference book check ISBN validator

39

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.

Educational geometry names polygon reference

38

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.

Educational chemistry diagram electron configuration orbital

38

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.

Productivity browser keyboard shortcuts OS viewer

37

Hijri to Gregorian Date Converter - Online Islamic Calendar

Convert between Gregorian and Hijri (Islamic) dates. Approximate visual reference. Local algorithm.

Converter calendar converter Gregorian Hijri

37

Alphabet of Elements - Online A‑Z by Chemistry Symbol

See all elements sorted alphabetically by symbol. Picture and atomic weight. Beautifully styled static list.

Educational alphabet chemistry elements symbol

37

Crypto Price Ticker - Online Live Bitcoin & Ethereum

Live cryptocurrency prices from public APIs. Clean ticker with percentage changes. Pure frontend, no account needed.

Finance Bitcoin crypto price ticker

37

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.

Map earthquake live map tracker

37

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.

Educational chemistry elements interactive periodic table

36

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.

Health protection reference sun UV index

36

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.

Educational acid base chemistry pH

36

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.

Educational astronomy constellation mythology stars

36

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.

Reference abbreviation acronym finder meaning

36

Git Cheatsheet - Online Common Commands Reference

Quick reference for frequently used Git commands with examples. Searchable and categorized. A handy resource for all developers.

Developer Tools cheatsheet commands Git reference

36

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.

Reference copy emoji lookup search

35

Units of Measurement Reference - Online Quick Guide

Search and browse a comprehensive table of SI units and common imperial conversions. For students and engineers.

Educational measurement metric reference units

35

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.

Educational diagram geology interactive rock cycle

35

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.

Educational digits math Pi reference

35

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.

Lifestyle breed dog identifier picture

35

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.

Color Tool CSS hex HTML color names reference

35

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.

Color Tool color names dictionary hex picker

35

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.

Developer Tools cheat sheet HTTP reference status codes

34

Birthstone Finder - Online Gem by Month

Select a month and see the modern and traditional birthstones with images and meaning. Classic reference.

Lifestyle birthstone gem jewelry month

34

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.

Productivity calendar date ISO week number

34

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.

Educational chemistry precipitates rules solubility

34

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.

Health air quality AQI health pollution

34

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.

Educational audio bird sounds identification nature

34

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.

Reference dictionary finder poetry rhyme

34

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.

Developer Tools cheatsheet commands Docker reference

34

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.

Educational country facts flag reference

33

Day of Year Calculator - Online Ordinal Date

Find out what day number of the year any date is (1‑366). Also shows days remaining. Simple reference.

Calculator calculator date day of year ordinal

33

Historical Cameras Timeline - Online Photography Evolution

Scroll through an interactive timeline of cameras from camera obscura to modern DSLR. Photos and facts.

Educational camera history photography timeline

33

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.

Entertainment literature quote random Shakespeare

33

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.

Photography cheat sheet exposure photography shutter speed

33

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.

Calendar calendar checker date leap year

32

Magnetic Declination Estimator - Online Compass Correction

Get the approximate magnetic declination for a given latitude and longitude. Apply correction to your compass.

Navigation compass declination magnetic navigation

32

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.

Educational dictionary etymology origin word

32

USB Pinout Reference - Online Connector Wiring Guide

Reference diagrams for USB‑A, USB‑C, micro‑USB pinouts. See wire colors and signal descriptions. Hardware hacking helper.

Electronics connector pinout reference USB

32

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.

Astronomy calendar moon phase predictor

32

Daylight Length Calculator - Online Sunrise Sunset Duration

For any latitude and date, calculate the exact daylight hours. See golden hour. Useful for gardening and travel.

Calculator daylight duration length sunrise

32

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.

Educational dictionary etymology reference word origin

32

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.

Educational digits e Euler's number math

32

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.

Reference country dialling code lookup reverse

32

Dream Interpreter Dictionary - Online Symbol Meanings

Search common dream symbols and their traditional meanings. For entertainment and self-reflection. Static data.

Lifestyle dream interpreter meaning symbol

31

Random Flower Name & Meaning - Online Botany Fun

Generate a random flower name along with its symbolic meaning and an illustrated color swatch. Local.

Generator flower generator meaning name

31

Currency Symbol Lookup - Online Find $ € ¥

Search by country or currency name to find its symbol and code. Quick static reference for international business.

Finance currency lookup reference symbol

31

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.

Network port reference TCP UDP

31

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.

Productivity file system format guide SD card

31

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.

Network cable color code ethernet RJ45