Tools & Utilities

Calculators, converters, design tools, and productivity apps

Practical utilities for everyday use. Timers, converters, color pickers, and design helpers.

110 experiments
Clocks
Analog, binary, polar, and word clocks. Four ways to see time pass.
Time
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Regex Playground
Real-time regex testing with match highlighting, capture groups, replace mode, and quick reference.
Tool
Timer Suite
Stopwatch with laps, countdown timer with ring progress, and Pomodoro (25/5/15 cycles).
Tool
Binary Converter
Convert between decimal, binary, octal, hex. Clickable bit toggles, bitwise ops, IEEE 754 breakdown.
Tool
🔒
Cryptography
Caesar, Vigenere, ROT13, Atbash, rail fence ciphers. Frequency analysis and Base64.
Tool
Markdown Editor
Side-by-side markdown editor with live preview. Toolbar, syntax highlighting, copy HTML output.
Tool
Color Picker
HSV color wheel with HEX/RGB/HSL/CMYK conversion. Color harmonies and saveable palette.
Design
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JSON Formatter
Format, minify, validate, and explore JSON with syntax highlighting and tree view.
Tool
Unit Converter
9 categories: length, weight, temperature, area, volume, speed, time, data, energy. 80+ units.
Tool
🔒
Password Generator
Cryptographically secure random passwords, passphrases, PINs. Strength meter and history.
Tool
Shadow Generator
CSS box-shadow builder with multiple layers, presets, and live preview.
Design
Habit Tracker
Daily habit tracking with streaks, completion rates, and monthly calendar view.
Tool
Scientific Calculator
Full scientific calculator with trig, log, memory, history, and keyboard input.
Tool
Lorem Ipsum
Placeholder text generator with 4 styles: Latin, Horatian, Hipster, and Tech.
Tool
Mind Map
Visual brainstorming tool with drag-and-drop nodes, color branches, and PNG export.
Tool
A
Typography
Font explorer with 10 Google Fonts. Size, spacing, weight, shadow controls and CSS output.
Design
Focus Timer
Pomodoro timer with ambient sounds (rain, white noise, binaural beats). Session tracking and streaks.
Tool
Flexbox Playground
Interactive CSS flexbox explorer. Toggle every property, see results live, copy CSS output.
Design
Weather Observatory
Simulated weather dashboard with animated icons, 7-day forecast, sun arc, and AQI for 12 cities.
Tool
🧭
Digital Compass
Interactive compass with manual drag and device sensor modes. Save waypoints with bearings.
Tool
Countdown Timer
Count down to any event with days/hours/minutes/seconds display. Save multiple countdowns, preset events, progress bar.
Tool
👁
Color Vision Simulator
See how images appear with protanopia, deuteranopia, tritanopia, and achromatopsia. Upload images, use camera, or test patterns.
Tool
🕰
World Clock
Analog and digital clocks for 8+ time zones. Auto-updating with day/night indicators and date display.
Tool
🎲
Dice Roller
RPG dice roller supporting d4-d100 with dice notation parsing, advantage/disadvantage, roll history, and statistics.
Tool
🌈
Gradient Generator
CSS gradient builder with linear, radial, and conic types. Draggable color stops, angle control, presets, copy CSS.
Tool
🔍
Regex Tester
Regular expression tester with live match highlighting, flag toggles, common patterns library, and cheat sheet.
Tool
BMI Calculator
Body Mass Index calculator with metric and imperial units. Visual bar chart with category ranges and health info.
Tool
🍅
Pomodoro Timer
Customizable Pomodoro technique timer with task list, session dots, auto break switching, and audio alerts.
Tool
Unit Converter
Convert between 10 categories of units: length, weight, temperature, speed, and more.
Tool
Stopwatch
Precision stopwatch with lap tracking, best/worst highlighting, and animated ring display.
Tool
💻
Binary Clock
Real-time clock displayed in binary. BCD and true binary modes, 12/24 hour toggle.
Tool
🔒
Password Generator
Cryptographically random passwords with strength meter, passphrases, and history.
Tool
Markdown Preview
Split-pane Markdown editor with live preview, toolbar, and word count stats.
Tool
Type Racer
Typing speed test with WPM, accuracy tracking, multiple difficulties, and history.
Tool
📊
Chart Maker
Create bar, line, pie, donut, and scatter charts with editable data and PNG export.
Tool
Habit Tracker
Weekly habit grid with streak tracking and localStorage persistence.
Productivity
💻
System Info
Browser, display, hardware, network, and feature detection.
Utility
Text Diff
LCS-based line diff with add/delete/same highlighting.
Utility
💰
Budget Tracker
Track income and expenses with categories and charts.
Productivity
📝
Notepad
Multi-tab note-taking with auto-save, download, and font options.
Productivity
📋
Kanban Board
Drag-and-drop task management with columns and priority colors.
Productivity
😀
Emoji Picker
Search and copy emojis by category with recently used tracking.
Utility
🔢
Word Counter
Text analysis with word frequency, readability score, and stats.
Utility
Event Countdown
Customizable countdown timer with presets, saves, and progress bar.
Utility
💱
Currency Converter
Convert between 20+ currencies with swap and conversion history.
Utility
🍳
Recipe Scaler
Scale recipe ingredients with fraction support and unit conversion.
Utility
💵
Tip Calculator
Calculate tips with percentage presets, bill splitting, and rounding.
Utility
🕒
Analog Clock
Beautiful analog clock with Roman numerals and multiple face styles.
Utility
Keyboard Tester
Test every key with visual keyboard layout and coverage tracking.
Utility
Favicon Generator
Create favicons from text, emoji, or shapes with live preview.
Design
🔤
Font Pairing
Find perfect font combinations for your designs.
Design
📏
Resistor Calculator
Decode resistor color bands with visual reference chart.
Electronics
🎨
CSS Filter Lab
Real-time CSS filter playground with presets and code export.
Design
Progress Bar Generator
Design CSS progress bars with solid, gradient, striped, and animated styles.
Design
Aspect Ratio Calculator
Calculate ratios, resize dimensions, and browse common formats.
Utility
Character Map
Browse Unicode characters by category with click-to-copy.
Utility
QR Code Generator
Generate QR codes from text and URLs with customization.
Utility
Chess Clock
Dual timer with Fischer increment and time control presets.
Utility
🌈
Color Wheel
Interactive HSL color wheel with harmony and format display.
Design
🔠
Text Case Converter
Convert between 13 text cases: camelCase, snake_case, UPPER, and more.
Utility
📅
Date Calculator
Date difference, age calculator, business days, and date math.
Utility
🎬
CSS Animation Generator
Visual keyframe editor with presets and CSS code export.
Design
Browser Speed Test
Benchmark your browser's JavaScript performance across 8 tests.
Utility
SVG Maker
Draw vector shapes and export SVG code with undo support.
Design
🌈
Color Blend
Mix colors with blend modes and generate gradients with WCAG contrast.
Design
📖
Reading Time Calculator
Estimate reading time with Flesch readability analysis.
Utility
🔤
Type Scale
Typography scale generator with ratio presets and CSS export.
Design
🖼
Pixelate
Apply pixelation effects to images with adjustable block size.
Tool
📊
CSV Tool
View, edit, sort and filter CSV data in a spreadsheet-like interface.
Tool
🔍
Regex Playground
Interactive regex tester with match highlighting, groups, and presets.
Tool
💾
Hex Editor
View text as hexadecimal with offset and ASCII display.
Tool
🎨
Eyedropper
Pick colors from generated gradients with palette building.
Tool
📐
Flexbox Playground
Interactive CSS flexbox property explorer with live preview.
Tool
🌈
Gradient Generator
Create and customize CSS gradients with live preview.
Design
📝
Code Editor
Write and run JavaScript in the browser with tabs and examples.
Tool
🎨
Color Harmony
Color wheel with complementary, triadic, and analogous harmonies.
Design
Grid Maker
Create custom grid layouts with flexible row and column configurations.
Design
Light Table
Compare images side by side with overlay and difference modes.
Design
Countdown Timer
Count down to any event with presets, saved timers, and live progress.
Utility
𝖠
Font Preview
Preview text in 22 system and web fonts with adjustable size, weight, and spacing.
Design
Pixel Font
Design pixel typefaces on an 8x8 grid with live text preview.
Design
Flowchart Maker
Drag-and-drop flowchart editor with shapes, connections, and PNG export.
Productivity
Morse Translator
Translate between text and Morse code with audio playback.
Utility
Speed Reader
RSVP speed reading with focus letter highlighting and WPM control.
Productivity
🏆
Bracket Builder
Create single-elimination tournament brackets with click-to-advance.
Utility
SVG Icon Builder
Compose SVG icons from basic shapes with code export.
Design
Recipe Timer
Multi-step cooking timer with alerts and presets.
Utility
Ohm's Law
Circuit calculator with visual meter and resistor color bands.
Electronics
🔐
Text Encoder
Encode and decode text in Base64, hex, binary, ROT13, and more.
Utility
🔌
Logic Circuits
Build logic gate circuits with real-time signal propagation.
Electronics
🎨
CSS Filter Lab
Experiment with CSS image filters and export the code.
Design
🍅
Pomodoro Pro
Focus timer with circular progress, task lists, and session tracking.
Productivity
📏
Graph Paper
Generate printable grid paper in square, isometric, hex, and dot styles.
Utility
🎨
Color Mixer
Blend colors with additive, subtractive, and average modes.
Design
🎯
Life Goals
Track aspirations with categories, progress bar, and persistence.
Productivity
🌈
Gradient Maker
Build CSS gradients with color stops and export code.
Design
😀
Emoji Search
Search, browse, and copy emojis by category and keyword.
Utility
🪢
Knot Guide
12 essential knots with step-by-step instructions and categories.
Practical
QR Code Studio
Generate QR codes for text, URLs, WiFi, email, and phone numbers.
Utility
SVG Patterns
Generate repeating SVG tiling patterns.
Design
Resistor Calc
Decode resistor color bands to values.
Electronics
Symbol Chart
Browse and copy Unicode symbols with codes.
Utility
A
Font Stack Builder
Preview and build CSS font stacks.
Design
📚
Virtual Bookshelf
Organize your reading list with visual book spines.
Utility
💠
Text Shadow Lab
Design layered CSS text shadows with presets.
Design
🎨
CSS Color Names
Browse all 148 named CSS colors with search and sort.
Design
CSS Box Model
Interactive CSS box model with margin, border, padding controls.
Design
CSS Clip Path
Create and preview CSS clip-path shapes.
Design
📏
CSS Units
Convert between all CSS length units with reference.
Design
🌍
Time Zones
World clocks, time conversion, and timezone timeline.
Utility
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