Tools
Small tools that run entirely in your browser.
77 of them
The big ones
Too big for one page.
SayerOS
experimentThe whole site as one desktop. Every page is an app in a window.
LLM
aiA language model on your own graphics card. Five to pick from, nothing sent anywhere.
Radio
audioLive stations and the site's own, grouped by sound, with the one playing marked.
Terminal
devA browser shell with pipes and globs, and four systems. The fourth is a real Linux.
Code Runner
devTwenty languages in the tab, a pane for what they draw, libraries served from here.
Slime Mould
simulationA million agents follow each other's trails into a network you can feed and fence.
AmbientA generative ambient soundscape
AttractorsTwo lines of arithmetic make a shape
Conway's LifeCells live or die by their neighbours
DendriteFrost, coral and copper from one growth rule
ErosionRain cuts a heightmap into valleys
MurmurationThousands of birds, three rules each
FluidDrag ink through water
LeniaCells hold shades, and creatures swim out
L-System GrowerRules that grow into ferns and dragon curves
Noise FieldAnimated fractal value noise
Reaction DiffusionCoral, spots and worms from two numbers
SandpileGrains topple into a fractal
FractalsMandelbrot, Julia, Burning Ship and Tricorn
Base ConverterBinary, hex, decimal, octal, any radix
Big OThe growth classes plotted against n
CalculatorStandard, scientific, programmer and RPN
Complex NumbersComplex arithmetic on an Argand diagram
DistributionsBinomial, Poisson and normal probabilities
Equation SolverPolynomial roots and simultaneous equations
Float VisualizerWatch a 32 or 64 bit float decode
Graph LayoutBuild a graph and watch it settle itself
Graphing CalculatorPlot four functions and read off their roots
Huffman CodingThe Huffman tree for any text
Levenshtein DistanceEdit distance between two strings, in full
Loan CalculatorPayment, interest and schedule for a loan
MatricesInverse, eigenvalues and more, up to 5 by 5
Numerical MethodsNewton Raphson, bisection, Simpson's rule
Prime CheckerPrimality, factors and nearby primes
SequencesArithmetic and geometric sequences and sums
StatisticsMean, quartiles, deviation, a box plot
Triangle SolverSine and cosine rule from three measurements
Unit ConverterLength, mass, temperature, speed and volume
VectorsDot, cross, angles, projections and more
ASCII ArtText or an image as a grid of characters
Barcode GeneratorCode 128 and EAN 13 barcodes as PNG
CipherCaesar, Atbash, Vigenère, ROT13 and Base64
ClocksA wall of clocks across timezones
Colour Blind SimProtanopia, deuteranopia and tritanopia
Colour PickerAny colour as HEX, RGB, HSL and OKLCH
Contrast CheckerWCAG 2 contrast ratio for two colours
Cron BuilderParse or build a cron expression
CSV ↔ JSONCSV to JSON and back
Diff CheckerPaste a before and an after
Easing EditorA draggable cubic bezier editor
EncodeEvery encoding of a string at once
File SignaturesIdentify file types by magic bytes
FlashcardsStudy cards on a spaced repetition plan
Glitch LabChromatic aberration and noise on an image
CSS GradientLinear, radial or conic gradients as CSS
HashSHA and MD5 digests for any string
Image ResizerCrop and resize an image, nothing uploaded
JSON ToolPretty print, validate, minify, traverse
Markdown EditorMarkdown with a live split preview
Morse CodeText to Morse and back, with audio playback
Palette ExtractorAn image's dominant colours by median cut
Password GeneratorCharacter sets in, entropy out
Pixel EditorPaint a small grid, export a PNG
QR GeneratorA QR encoder, versions 1 to 10
RegexRegular expressions with live matches
Subnet CalculatorNetwork, broadcast and range for any IPv4
SVG Path EditorDraw an SVG path by hand
TimerA countdown with an alarm, and a stopwatch
TimestampEpoch seconds to readable dates and back
UUID GeneratorRandom v4, time ordered v7, in batches