Music
Improvisation Lab
Generate piano-friendly prompts for scales, chords, progressions, motifs, target tones, and timed practice rounds.
Piano Bench Lab
Connect a MIDI keyboard for real-time chord and scale verification, or try the drills with on-screen note buttons.
Sight Reading Runner
Practice side-scrolling treble and bass staff notes at the piano with configurable range, spacing, and speed.
Theory Fundamentals Drill
Build automatic recall for key signatures, circle of fifths, relative keys, scale spelling, and diatonic chords.
Chord Flashcards
Practice chord symbols, chord qualities, note spelling, and common harmonic colors.
Interval Flashcards
Test your recognition and speed with interactive interval flashcards.
Interval Worksheet
Generate, practice, and review custom music theory interval worksheets.
Theory Units Quiz
Review keys, intervals, rhythm, chords, counterpoint, and four-part writing from the first six theory units.
Finance
Mortgage Calculator
Estimate payments, compare loan scenarios, and review amortization details.
Saved Mortgage Calculator
Save mortgage scenarios as public JSON files and load them back from S3 later.
Development
XML Value Compare
Compare two XML files by parsed structure, attributes, and values instead of raw text formatting. File contents stay local in your browser.
JSON Value Compare
Compare two JSON files by parsed objects, arrays, and scalar values. Object key order is ignored and file contents stay local in your browser.
YAML Value Compare
Compare common YAML maps, lists, and scalar values without a raw text diff. File contents stay local in your browser.
Plotting Tool
Draw functions, parametric curves, and scatter data on a live canvas with pan, zoom, presets, and PNG export.
Simulators
Reaction-Diffusion
Explore Gray-Scott chemistry patterns with sliders, presets, concentration plots, and live model metrics.
Boids Flocking
Tune separation, alignment, cohesion, and noise to watch local steering rules become emergent flock motion.
Cellular Automata
Explore Wolfram rules like 30, 90, and 110 with live rule tables, density plots, and generated histories.
Forest Fire
Grow forests, trigger lightning strikes, and tune fire spread radius to watch stochastic burn cycles emerge.
Certification Study
AWS Solutions Architect Pro
Study roadmap, official resources, domain breakdowns, scenario drills, and readiness tracking for the AWS Solutions Architect - Professional exam.
Site
Site Notes
Learn how this static S3 toolbox is structured, deployed, and extended with GitHub Actions, AWS, and AI-assisted pages.