Convert, calculate, encode.
In your browser.

Count, convert, clean and compare text.

• Word Counter Count words as you type, and set a goal to write to.
• Title Case Converter Capitalize the first letter of each word. On your device.
• Find and Replace Search and replace text, with regex and a live match count.

Percentages, discounts, tips and everyday math.

• Percentage Calculator Percent of a number, or the change between two. On your device.
• Discount Calculator Sale price and how much you save, by percentage or amount.
• Tip Calculator The tip, the total, and the split between any number of people.

Format, encode, hash and inspect data.

• JSON Formatter Pretty-print JSON with proper indentation.
• What Is My IP See the public IPv4 and IPv6 this connection presents.
• CIDR Calculator Paste a CIDR. Get the network, range and wildcard.

Focus, plan and keep track.

• Pomodoro Timer Stay focused with timed work sessions and breaks.
• Notepad Quick notes that save themselves, right in your browser.
• Todo List Tasks and subtasks tracked privately in your browser.

Interest, savings and growth, projected.

• Compound Interest Calculator Watch savings grow, with optional monthly contributions.
• SIP Calculator Future value of a monthly SIP, and what returns add on top.
• Savings Goal Calculator How much to save each month to hit a goal by a target date.

Passwords, UUIDs, QR codes and filler text.

• Password Generator Strong random passwords, with a live strength estimate.
• UUID Generator Random version 4 UUIDs, one or many at a time.
• QR Code Generator QR codes for a URL, Wi-Fi, contact or plain text. PNG or SVG.

Motion, waves, heat and circuits, made visual.

• Projectile Motion Calculator Aim a launch and watch the arc. Range, peak height and flight time, live.
• Ohm's Law Calculator Set voltage and resistance, watch current and power in a live circuit.
• Wave Speed Calculator Watch a wave travel and see how frequency and wavelength set its speed.

Triangles, matrices, fractions, probability and trig.

• Interactive Unit Circle Calculator Interactive unit circle: drag the point and read sin, cos, and tan.
• Quadratic Equation Solver Slide the coefficients and watch the roots move on a live parabola.
• Fraction Calculator Add, subtract, multiply or divide fractions with every step shown.

Conformers, bonds, molecular shape and reaction rates.

• Newman Projection Calculator Rotate the bond and watch the strain energy curve draw itself.
• Molecular Geometry Calculator Watch electron geometry and molecular shape come apart as you add lone pairs.
• Reaction Rate Calculator Set the barrier and the temperature, then watch the reaction run.

Ages, durations, bedtimes, time zones and timestamps.

• Age Calculator Your exact age in years, months and days, plus a birthday countdown.
• Timezone Converter Convert a time between zones, daylight saving handled.
• Unix Timestamp Converter Unix timestamp to a date and back, in seconds or milliseconds.

BMI, calories, macros and training numbers.

• BMI Calculator Your BMI from height and weight, with the healthy range for you.
• TDEE Calculator Your daily energy expenditure, and calories to lose or gain.
• Macro Calculator Split a calorie target into protein, carbs and fat.

Colors, contrast, shade scales, type scales and CSS units.

• Color Format Converter HEX, RGB, HSL, HSV, OKLCH and CMYK, on your device.
• WCAG Color Contrast Checker Check text and background against WCAG AA and AAA contrast.
• PX to REM Converter px to rem, em and pt, against your root font size.

Equalizer settings you can actually use.

• Music Equalizer Settings Find your sound, then copy the numbers into your own player.

Virtual fidget toys online. No app install.

• Pop It Tap the bubbles. Infinite mode when you want more.
• Gears Spin the pair. The ratio stays honest.
• Fidget Spinner Flick it. It spins, then it stops.

Prepare text before a model sees it.

• Prompt Packer Assembles a prompt from fields. Does not write it.
• JSON to JSON Schema Types from this example. Not a required-field list.
• Context Fit Checker An estimate of context use. Not a tokenizer.

Two players, one device. No account.

• Tic Tac Toe New Two players, one phone. Undo a mis-tap.