Free browser tools for every continent, on any phone.

Useful tools, instantly, anywhere in the world

Tools

Unit Converter

Convert between length, mass, temperature, volume, area, and speed units instantly.

QR Code Generator

Turn any link or text into a scannable QR code — generated entirely on your device.

Password Generator

Generate a strong, random password with the character types and length you choose.

Pomodoro Timer

Work in focused sprints with short breaks, using the classic Pomodoro technique.

Color Palette Generator

Generate a matching 5-color palette from any base color, or roll a random one.

World Clock

See the current time in cities around the world, side by side.

Image Resizer & Converter

Resize, compress, and convert images between JPG, PNG, and WebP — entirely on your device.

Regex Tester

Test regular expressions against sample text with live highlighting of every match.

Proofreader

Paste your text to catch double spaces, repeated words, and other easy-to-miss mechanical slips.

Markdown Editor

Write Markdown on the left, see the formatted preview update live on the right.

JSON Formatter

Format, validate, and minify JSON data — spot syntax errors instantly.

Function Grapher

Plot any mathematical function of x and explore its shape by adjusting the range.

Statistics Calculator

Enter a list of numbers to instantly get mean, median, mode, variance, and standard deviation.

Projectile Motion Simulator

Simulate projectile motion under gravity — adjust speed, angle, and gravity to see the trajectory change.

Molar Mass Calculator

Enter a chemical formula like Ca(OH)2 to compute its molar mass and element breakdown.

Loan & Savings Calculator

Estimate monthly loan payments or project savings growth with compound interest.

BMI Calculator

Calculate your Body Mass Index from weight and height, with an instant category readout.

Moon Phase Calendar

See the moon's phase and illumination for any date, calculated on the spot.

Trend Predictor

Enter a series of numbers and project the next values based on the linear trend.

Scientific Unit Converter

Convert between pressure, energy, power, data storage, and frequency units.

Fractal Viewer

Explore the Mandelbrot and Julia sets — click anywhere to zoom into the pattern.

Flashcards

Flip through flashcards to test your recall — shuffle for a fresh order anytime.

Typing Practice

Type the sentence shown to measure your speed (WPM) and accuracy.

Phrase Comparison

See how a common phrase is said in all 10 supported languages, side by side.

Quote of the Day

A new inspiring quote every day, with more to discover whenever you like.

History Timeline

Scroll through major world events from ancient history to the modern era.

Quiz Portal

Test your general knowledge with a short multiple-choice quiz and see your score.

Algorithm Glossary

Look up common programming and algorithm terms with plain-language explanations.

Reading Tracker

Keep a simple list of books you want to read, are reading, or have finished.

Grammar Checker

Catch common English grammar slips like a/an mix-ups and double negatives.

Logic Puzzles

Solve short riddles and brain teasers, one at a time.

Meal Suggester

Check off ingredients you have on hand and get recipe suggestions.

To-Do List

A simple, no-frills task list that stays on your device.

Habit Tracker

Track daily habits on a 7-day grid and watch your streak grow.

Mind Map

Sketch out ideas as a draggable node map branching from a central topic.

Travel Planner

Check off your packing list and track your trip budget in one place.

Breathing Guide

Follow a visual breathing rhythm — box breathing, 4-7-8, and more.

Random Decider

Can't decide? Enter your options or flip a coin to let chance choose.

Budget Tracker

Log income and expenses to see your running balance at a glance.

Sleep Cycle Calculator

Find the best bedtime or wake-up time based on 90-minute sleep cycles.

Pixel Art Editor

Draw pixel art on a 16×16 grid and download it as an image.

Avatar Maker

Mix and match skin tone, hair, and eyes to build a simple avatar.

Beat Sequencer

Tap out a drum pattern on a 16-step grid and loop it.

Art Gallery

Browse a small gallery of famous public-domain paintings.

Interactive Story

Choose your path through a short branching adventure story.

Digital Zen Garden

Drag your finger to rake calming patterns in the sand around the stones.

Soundboard

Tap buttons to play fun synthesized sound effects instantly.

Wallpaper Generator

Generate a gradient, dot, wave, or geometric pattern wallpaper and download it.

Star Map

Browse well-known constellations and learn a bit about each one.

Life Timeline

Log the milestones of your life and see them laid out chronologically.

Spring Oscillation

Watch a mass on a spring bounce and see how mass, stiffness, and damping change the motion.

Pendulum Motion

Swing a pendulum and see how its length changes the period of each swing.

Friction on an Incline

Adjust the incline angle and friction coefficient to see whether a block slides.

Free Fall: Vacuum vs. Air Resistance

Compare falling in a vacuum against falling with air resistance and see the terminal velocity.

Collision Simulator

Set two masses and velocities and watch an elastic collision play out.

Circular Motion

Adjust radius and speed to see centripetal force and acceleration on an orbiting mass.

PID Control

Tune P, I, and D gains and watch how the system responds — overshoot, oscillation, or a smooth approach.

Circuit Simulator

Adjust voltage and resistance and watch an LED brighten as current increases, following Ohm's law.

Center of Mass

Drag point masses around and watch the center of mass update in real time.

Moment of Inertia

Compare how a disk, ring, rod, or sphere resist rotation for the same mass and radius.

Wave Interference

See how two wave sources combine to create bright and dark interference fringes.

$Light Refraction$

Light Refraction

Adjust the angle and refractive indices to see how light bends passing between two materials.

Lens Imaging

Move an object and change the focal length to see where a lens forms its image.

Doppler Effect

Watch a moving sound source and see how the perceived frequency shifts as it approaches and recedes.

Magnetic Field Lines

See how field lines curve for a single magnet and how two magnets attract or repel.

Concrete Strength Estimator

Estimate compressive strength from a mix ratio and see how it develops as it cures.

Stress-Strain Curve

Compare how steel, aluminum, and copper stretch and yield under load.

Heat Conduction

See how wall thickness and material affect the temperature gradient and heat flow.

Parachute Descent

Jump, then deploy the parachute and see how the descent speed slows.

Orbital Mechanics

Adjust a satellite's altitude and see how its orbital speed and period change.

Beam Deflection

Load a simply-supported beam and watch it bend, with the max deflection calculated for you.

Wind Tunnel

Compare drag force on different shapes — sphere, cube, streamlined body, and flat plate.

Fluid Streamlines

See how flow lines split and rejoin as fluid streams around a circular obstacle.

T-Test Calculator

Enter two groups of numbers to see if their means differ significantly.

Correlation & Regression

Plot x,y data points to see their correlation and best-fit line.

Probability Distribution

Shape a normal distribution curve and find the probability of a range of values.

Integral Visualizer

See the area under a curve build up as a sum of rectangles, approximating the integral.

Derivative & Tangent Slope

Slide a point along a curve and watch the tangent line follow, showing the slope at each point.

Prime Number Spiral

See prime numbers plotted on an Ulam spiral, revealing surprising diagonal patterns.

Bayesian Estimation

See how a positive test result updates your belief, given the base rate and test accuracy.

Complex Number Plane

Multiply two complex numbers and see how their magnitudes multiply and angles add on the plane.

Vector Addition

Drag two vectors and see their sum drawn as the diagonal of the parallelogram.

Matrix Transformation

Apply a 2×2 matrix to a square and see it rotate, scale, shear, or reflect.

Poisson Distribution

Adjust the average event rate and see how the Poisson distribution shape changes.

Monte Carlo Pi Estimator

Drop random points into a square and watch the ratio inside the circle approximate π.

Polygon Area Calculator

Tap to place vertices and see the area and perimeter of your polygon calculated live.

Golden Ratio

See a rectangle divided again and again by the golden ratio, forming the classic spiral pattern.

Sequence Convergence

Watch classic sequences like (1+1/n)ⁿ converge toward their famous limits.

3D Rotation

Rotate a cube around the X, Y, and Z axes and watch it project onto the 2D screen.

Differential Equation Solver

Compare Euler's method against Runge-Kutta 4 for solving a damped oscillator equation.

Fourier Series

See how adding more sine wave harmonics builds up square, sawtooth, and triangle waves.

Venn Diagram Calculator

Adjust two set sizes and their overlap to see the union and each region's count.

Probability Tree

See every possible outcome of repeated events and their combined probability.

Measurement Error Analysis

Enter a set of measurements and the true value to see absolute, relative, and standard errors.

Permutations & Combinations

Enter n and r to instantly calculate nPr and nCr.

Compound Interest Visualizer

See how regular contributions and compound growth build your balance over the years.

Pension Simulator

Simulate saving through your working years and drawing down through retirement.

Net Salary Calculator

Estimate your take-home pay after progressive tax and social insurance deductions.

Prorata Calculator

Calculate a prorated amount for a partial billing period, like rent or a subscription.

Reverse Tax Calculator

Enter a tax-included price to find the pre-tax amount and the tax portion.

Percent Change Calculator

Enter an old and new value to instantly find the percent increase or decrease.

Goal Progress Tracker

Enter your current progress and target to see a visual completion percentage.

Calorie Needs Calculator

Estimate your basal metabolic rate and daily calorie needs based on your activity level.

BMI Trend Tracker

Log a series of weight measurements to see your BMI trend over time.

Recipe Scaler

Enter your ingredients and change the serving size to scale every quantity automatically.

Fridge Inventory

Track what's in your fridge and get warned before items expire.

Travel Budget Allocator

Split your total travel budget across accommodation, food, transport, and more.

Electricity Bill Simulator

Estimate your monthly electricity cost from your appliances' wattage and daily usage.

File Transfer Time

Calculate how long a file transfer will take based on its size and your connection speed.

Brick & Wall Material Calculator

Enter wall dimensions and brick size to find out how many bricks you'll need.

Wiring Voltage Drop Calculator

Check whether your wire gauge and run length keep voltage drop within a safe range.

Paint Area Calculator

Enter wall size, openings, and coats to find how much paint you'll need.

Concrete Mix Calculator

Enter your target volume and mix type to find how much cement, sand, and gravel you need.

Pipe Flow Velocity

Enter flow rate and pipe diameter to find velocity and whether the flow is laminar or turbulent.

Fuel Economy Calculator

Enter distance and fuel used to see your consumption in L/100km, km/L, and MPG.

Piggy Bank Simulator

See how quickly a daily savings amount adds up to reach your goal.

Inflation Impact Calculator

See how inflation erodes purchasing power and inflates prices over time.

Color Space Converter

Pick a color and see it instantly converted between RGB, HSL, and CMYK.

Bitrate & File Size Calculator

Estimate the file size of video or audio from its bitrate and duration.

JSON Tree Viewer

Paste JSON and explore it as a collapsible, color-coded tree.

Password Strength Checker

Type a password to see its estimated entropy and strength rating in real time.

Unicode Character Inspector

See the code point, UTF-8 bytes, and HTML entity for every character you type.

Hash Generator

Compute SHA-1, SHA-256, SHA-384, or SHA-512 hashes of any text, entirely in your browser.

Prime Factorization

Enter any number and instantly see its prime factorization.

pH Calculator

Convert between pH and hydrogen ion concentration, and see if a solution is acidic or basic.

Musical Note Frequencies

Tap any note to hear its equal-temperament frequency, calculated from A4 = 440Hz.

Metric vs Imperial Comparison

See height, weight, distance, temperature, and volume side-by-side in metric and imperial units.

Latitude/Longitude Converter

Convert decimal coordinates to degrees, minutes, and seconds notation.

Date Difference Calculator

Pick two dates to find the total days between them and a years/months/days breakdown.

Bit Manipulation Visualizer

Tap bits to toggle them and see AND, OR, XOR, NOT, and shift operations live.

Font Comparison

Type sample text and see it rendered side-by-side in several classic web-safe fonts.

No install, no sign-up. Pick a tool and start using it in seconds.

Browse all tools