Logo Playground
Write Logo programs and watch the turtle draw and play music.
mckoss.com/logo/playground Read the post →Apps
27 apps
Turtle Tiles
Logo for kids who can't read yet: tap picture tiles to make the turtle draw and play notes. Installs for offline use.
mckoss.com/logo/tiles Read the post →
Message Killer
A companion to Google Messages for Android that moves political ads and donation texts into its own spam folder.
github.com/mckoss/message-killer/releases/latest
Prime Scanner
An exhaustive scan of the primes from zero (past 5.6 trillion) that re-derives the OEIS's record prime gaps, and their lonely, aloof and equidistant relatives, term by term.
github.com/mckoss/prime-scanner
MBBB Music
The Mutiny Bay Brass Band's music library: charts by part and instrument, for practice and gigs.
mbbb-music.mckoss.com
Dark Towers
Flights at Paine Field with no control tower on duty, and every close approach, replayed.
dark-towers.orgAI Quota Tracker
How much of your Claude, Codex and Gemini limits you've used; schedules background agents into spare quota.
ai-quota.mckoss.com
Cube Simulator
A Rubik's Cube you can turn and solve on screen.
mckoss.com/cubing Read the post →
Enigma Simulator
A working simulation of the 3-rotor German Enigma machine.
mckoss.com/enigma-simulator-js Read the post →
Morse News
Today's headlines, sent in Morse code.
morse-news.mckoss.com Read the post →
Rubikon Playground
Practice a solving method move by move.
mckoss.com/cubing/playground Read the post →
Whidbey Island Dashboard
Live Whidbey Island conditions at a glance.
whidbey-dashboard.mckoss.com Read the post →
Bio Overlay
Live heart rate from Polar chest straps, overlaid on your video for a remote trainer on Zoom. A desktop app, and a web version in Chrome.
mckoss.com/bio-overlay
DAWG Packer
Packs a word list into a compact word graph for fast lookups.
mckoss.github.io/dawg Read the post →
Mac Thermals
Logs your Apple Silicon Mac's temperatures and fan speeds, with a dashboard of trends.
github.com/mckoss/temp-logger Read the post →
Sonic Messaging Experimental
Send data between nearby devices by sound; a test bed for modulation schemes.
mckoss.com/sonic-messaging
Letter Tracer
Toddlers trace letters and numbers with a finger, with voice and confetti. Works offline.
mckoss.com/letter-tracer
Knowledge Graph
Explore how math and physics concepts build on one another.
mckoss.com/math-graph
Inertial Recorder Experimental
Records lateral g-force from your phone while you drive.
mckoss.com/inertial-recorder
ABC Rhythm Experimental
Tap in time to turn a melody's notes into a scored piece in ABC notation.
mckoss.com/abc-rhythmDVD Ripper
PowerShell scripts for Windows that rip DVDs, encode them with HandBrake, and upload to Google Drive.
github.com/mckoss/dvd-ripper
Maze 3D
Build and view three-dimensional mazes.
mckoss.com/maze3d
Racetrack
Martin Gardner's pencil-and-paper racing game, with automated drivers.
mckoss.com/racetrack
Wordle Guesser
A one-page printout that solves all 2,315 Wordle answers, starting with CRANE: 3.45 guesses on average, never more than 5.
mckoss.com/wordle-guesser/public/wordle-solution.htmlWide-JSON
A JSON formatter, as a command line tool and library, that uses the full line width instead of going tall.
github.com/mckoss/wide-json
Maze Canvas
Counts every maze of a given size and draws them.
mckoss.com/maze-canvas/maze-generator.htmlEvolution Game Being revived
An evolution simulation from the original mckoss.com, being brought back to life.
github.com/mckoss/evosystemNo apps here. Press Experimental to see the ones still in development.