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Bandwidth Calculator
Convert between data units, estimate file transfer time, size website bandwidth from traffic, and convert between a monthly data allowance and a sustained connection speed.
FreeCalculators
Average Return Calculator
Calculate a true annualized investment return from irregular, dated cash flows using XIRR, or chain together multiple known returns over different holding periods into one annualized figure.
FreeCalculators
Auto Lease Calculator
Estimate a car lease's monthly payment with a full depreciation/finance/tax breakdown, solve for the max price that fits a target payment, and convert between money factor and APR.
FreeHardware
Dead Pixel Test
Cycle full-screen through 9 solid colors to spot dead, bright, or stuck pixels on any monitor, laptop, phone, or TV, with an auto-play mode for hands-free scanning.
FreeCalculators
Screen Size Calculator
See your screen's real resolution and pixel ratio live, and calculate PPI, pixel pitch, and physical size in inches or centimeters from any diagonal size and resolution.
FreeHardware
Flicker Test
A clean reference screen and step-by-step instructions for detecting PWM backlight flicker with your phone camera, plus a strobe reference.
FreeHardware
Blooming Test
Test your Mini LED or FALD display for blooming with a star field, center, corner, and edge dot patterns and adjustable dot size.
FreeHardware
Black Level Test
Test how well your screen distinguishes near-black shades with 12 labeled RGB patches and a fullscreen single-patch view.
FreeHardware
Screen Tearing Test
Test your screen for tearing with sweeping bars at an adjustable frame-locked speed, plus a VSync/FreeSync/G-Sync explainer.
FreeCalculators
Aspect Ratio Calculator
Compute missing dimensions from a ratio, simplify pixel dimensions to a ratio, or resize proportionally, with a live preview and common ratio presets.
FreeCalculators
APR to APY Calculator
Convert between APR and APY at any compounding frequency, with a comparison table and dollar example.
FreeCalculators
Anova Calculator
Run a one-way ANOVA test with full statistics table, effect size, and a group comparison chart, right in your browser.
FreeCalculators
Angular Velocity Calculator
Convert angular velocity between RPM, rad/s, Hz, and more, or derive it from linear speed and radius.
FreeCalculators
Amortization Calculator
Calculate a loan's monthly payment and full amortization schedule, with extra-payment savings.
FreeCalculators
BMI Category Checker
Check your BMI category from Severe Thinness to Obese Class III, with a healthy weight range for your height.
FreeCalculators
Algebraic Expression Simplifier
Simplify an algebraic expression by combining like terms, with a step-by-step breakdown.
FreeImage
Remove Background Image (AI)
Automatically cut the background out of a photo using an on-device AI model, right in your browser.
FreeImage
Bulk Batch Adjust Gamma Image
Apply the same gamma correction to many images at once, right in your browser.
FreeText
Add Line Breaks
Add line breaks after each delimiter, every N characters (word-wrapped or exact), or every N words, with a live line count.
FreeCalculators
ACT Score Calculator
Calculate your ACT composite score from your four section scores, or compute your superscore across multiple test attempts.
FreeText
Acronym Generator
Turn a phrase into its acronym instantly, with a letter-by-letter breakdown and an optional minor-word-skipping mode.
FreeCalculators
Acres to Square Miles Converter
Convert between acres and square miles in either direction, live as you type, with a quick-reference table and square meters equivalent.
FreeCalculators
Acid Test Ratio Calculator
Calculate the acid test (quick) ratio from balance sheet totals or individual quick assets, with a healthy/moderate/weak read.
FreeCalculators
Absolute Value Inequality Solver
Solve |ax + b| compared to c for any of <, ≤, >, or ≥, with step-by-step reasoning and interval notation.
FreeCalculators
Absolute Value Calculator
Find the absolute value of a number or arithmetic expression with a step-by-step explanation, or process a whole batch list at once.
FreeGame
24 Game Solver & Trainer
Solve the classic 24 Game instantly, or practice against the clock with an auto-generated, guaranteed-solvable puzzle and live scoring. Free, private, runs in your browser.
FreeHardware
Screen & Monitor Tester
Check a laptop, monitor, or TV before you buy it secondhand: dead/stuck pixel sweep, light bleed and IPS glow test, burn-in and banding check, refresh rate measurement, motion/ghosting test, and a black/white level test.
FreeDownloader
Bandcamp Track Downloader
Paste a Bandcamp track link and download the public stream as an MP3 for offline listening. No account, no extension, no Bandcamp login.
FreeText
Cron Expression Generator
Build and parse cron expressions with a live field editor, plain-English description, and the next 5 actual run times. Supports presets, @ shortcuts, and the optional 6-field seconds variant.
FreeText
Secrets/Config Redactor
Paste a .env or config file and automatically mask API keys, passwords, and tokens next to sensitive key names or known secret formats (AWS, GitHub, Stripe, JWT, PEM). Safe to then paste into a chat AI or bug report.
FreeText
ASCII Art Generator
Turn typed text or an uploaded image into ASCII art. Choose a font style or character ramp, preserve color, and export as plain text or PNG.
FreeGame
Amidakuji (Ladder Lottery Generator)
Generate a random, fair "ghost leg" ladder lottery (amidakuji) that pairs participants with outcomes one-to-one. Trace each line down the ladder to reveal results, or show them all at once.
FreeCalculators
Box and Whisker Plot Maker
Turn one or more datasets into box-and-whisker plots with five-number summary, mean, standard deviation, and outlier detection.
FreeCalculators
Blood Donation Time Calculator
Calculate your next eligible blood donation date based on your last donation and donation type, using common waiting-period guidelines.
FreeCalculators
Bitwise Calculator
Perform AND, OR, XOR, NAND, NOR, XNOR, NOT, and bit shift operations on binary, octal, decimal, or hexadecimal numbers.
FreeGame
Bingo Card Generator
Generate unique, print-ready 5x5 bingo cards with classic 1-75 numbers, custom words, or emojis, in a choice of color themes.
FreeCalculators
Binary Calculator
Add, subtract, multiply, and divide binary numbers directly, with results shown in binary and decimal, plus a binary/decimal converter.
FreeCalculators
Big Number Calculator
Perform exact arithmetic on numbers far larger than a normal calculator can handle: addition, subtraction, multiplication, division, exponentiation, square root, factorial, modulo, GCD, and LCM.
FreeCalculators
Pressure Converter
Convert pressure between Pa, kPa, MPa, bar, PSI, atm, torr, and inHg all at once, with a visual gauge and presets for tires, bikes, and scuba tanks.
FreeText
Backronym Generator
Turn any acronym or word into a backronym across 6 tones and 5 sentence patterns, with custom words per letter and Memorability/Pronounceability scoring.
FreeCalculators
Average Rate Of Change Calculator
Calculate the average rate of change of any function f(x) (polynomials, trig, logs, roots, and more) over an interval [a, b], with a graph of the function and its secant line.
FreeCalculators
Auto Loan Calculator
Estimate a car loan's monthly payment, total interest, and total cost of ownership, accounting for down payment, trade-in (including negative equity), incentives, sales tax, and fees.
FreeHardware
Refresh Rate Test
Measure your display's real, live refresh rate right in your browser using requestAnimationFrame timing, and catch a monitor advertised at 144Hz or higher that is really only running at 60Hz.
FreeHardware
Brightness Test
Test your screen with a 10-step brightness ladder and a 9-zone fullscreen uniformity check to spot clouding or uneven backlighting.
FreeHardware
Color Banding Test
See exactly what 6-bit vs 8-bit color banding looks like with an honest, adjustable mathematical quantization simulation.
FreeHardware
RGB Channel Test
Test your screen for dead, stuck, or hot pixels with pure red/green/blue channel isolation plus any custom color via hex or picker.
FreeHardware
Touch Screen Test
Test a touchscreen with multi-touch visualization, a free-draw precision canvas, and a dead-zone grid coverage scan.
FreeHardware
HDR Test
Check what your browser and display report about HDR and wide color gamut support, with a real sRGB vs Display P3 visual comparison.