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Federal Ministry of Finance calculator for German wage and income tax.

Official German income tax calculation form.

Calculates BMI from height and weight and explains the categories.

Calculates basal metabolic rate and daily calories by activity level.

Estimates body fat percentage with several formulas.

Compares seven published ideal-weight formulas for a given height.

Sourdough workbench with a baker's percentage calculator, levain builder and bake schedule, saved in your browser.

Learn to play drums with a collection of popular grooves shown in groove notation with playback.

Generates a Tailwind-style color scale from a base color.

Calculates RC low-pass cutoff and draws Bode magnitude and phase plots, with an audio demo.

Estimates body fat percentage with the US Navy method and keeps your values in the browser.

Logic gate simulator with drag-and-drop gates and wires built in React.

Generates deterministic SVG avatars from a name and palette.

Free simulator that converts French gross pay into net.

Translates Morse code to text and text to Morse code.

Translates to and from pigpen cipher symbols.

Analyses ciphertext and suggests which type of cipher produced it.

Charts letter frequencies in a text to help break ciphers.

Encodes and decodes ADFGVX ciphers.

Encodes and decodes affine ciphers with chosen keys.

Decodes and encodes the Atbash cipher.

Encodes and decodes the Beaufort cipher.

Encodes and decodes bifid ciphers.

Decodes book ciphers where numbers point to words or letters in a text.

Encodes and decodes Caesar ciphers and tries all shifts.

Encodes and decodes columnar transposition ciphers.

Encodes and decodes four-square digraph ciphers.

Encodes and decodes Playfair ciphers.

Encodes and decodes rail fence ciphers with a chosen number of rails.

Encodes and decodes ROT13 text.

Solves substitution ciphers with frequency tools and manual guesses.

Encodes and decodes trifid ciphers.

Encodes and decodes Vigenere ciphers and helps guess the key.

Translates text to and from tap code knock sequences.

Generates parametric boxes, trays and mechanical parts as SVG, DXF or PDF for laser cutting.

Customizable bracket maker for running tournaments, with a clean look that can be shared with participants.

Shows the Braille alphabet and numbers with interactive practice.

Converts text to Braille characters you can copy.

Converts pay between hourly, monthly and annual figures within a set of everyday tools.

Lists business name ideas by category, with 30+ suggestions for each.

Lookup of official brand hex colors, downloadable in several formats.

Renders exported Claude widgets and artifacts offline with the missing theme styles restored, and stores them in the browser.

Computes dough hydration from flour and water weights and converts recipe formulas.

PWA for working out coffee-to-water amounts, timing a pour-over and following brew recipes offline.

Crossword maker where you enter words and clues, then print the puzzle or share it online.

Turns your age into target heart rate bands for fat burning, cardio and peak effort.

Renders a canvas image and shows the resulting hash used for tracking.

Reveals the User-Agent Client Hints your browser sends or exposes.

Lists fonts your browser exposes to scripts, a signal used for fingerprinting.

Tests what the browser Geolocation API reveals when permission is granted.