🧩 Alvin

Jazz piano ii–V–I practice in all 12 keys. Two fixed keyboards (left hand root+fifth, right hand 13th voicings anchored on the tonic), 8 rhythm comping styles, roll playback and Web Audio.

Harness/index for the French course: grid of all 37 lessons with progress bar, links into the lesson player (french-course.html?chapter=N), ready/coming-soon badges.

Digitized French grammar workbook (Grégoire, CLE International, niveau débutant): 60 lessons, each with the grammar page + all exercises, an interactive exam compiling every exercise in the book, and French text-to-speech for every lesson.

Harness/index for the Japanese course (新日本語の基礎): a card per lesson with vocab-mastered and focus-list progress, a Mark-complete button that greys a finished lesson out (click it again to re-enable), and links into the lesson player. Lessons are built from the source PDFs in waves.

Eleven real-world Japanese travel scenarios digitised from the 音速旅遊日語 dialogue booklets: checkout, hotel, restaurant, airport check-in, train tickets, photography, post office, when you don't understand, clothes shopping, trouble, and the ten question-word patterns. Every sentence has its own 🔊 clip plus a .play-the-whole-dialogue button, romaji, English and the book's Chinese, a per-sentence grammar breakdown, ✅ mastered / 🎯 focus marks, and a 🔁 leisure-wording swap that replaces the book's business or dated keywords (音速太郎, 喫煙席, nanaco, 領収書は会社名で…) with what a holidaymaker actually says. Four practice kinds — meaning, listening, keyword gap-fill and romaji typing — plus a role-play mode that speaks the other side and waits for you to answer.

Net worth and asset allocation over time from monthly Fidelity + Chase statements. Total assets by account, allocation by asset class (cash / ETF / mutual fund / stock), per-stock price and value performance, income & dividends by month, holdings table, and in-app PDF import (drops into ~/Downloads/statement, parsed into ~/finance/finance.db).

Investment portfolio over time from 59 months of Chase (J.P. Morgan) and Fidelity statements (Oct 2021 – Aug 2026, 8 accounts incl. opened/closed ones). Stacked value chart with drag-to-zoom into any period; snapshot at the selected date; period gain/loss split into net contributions vs market movement vs income; allocation by account type and asset class; sortable per-symbol holdings with change over the window; and in-app statement upload. Investments only — not a full net-worth figure.

Backtest two strategies on IGV vs SOXX (6,322 sessions, 2001-07-17 → 2026-09-04, Yahoo Finance daily open/close in ~/pairs-trading/igv_soxx.db), each with an optional start date: (1) Pairs swap — set a target delta (gap between the ETFs' intraday open→close moves) and a % of the winner's shares to rotate into the loser, starting 100 sh each; (2) Per-stock buy-the-dip/sell-the-rip — monitor ONE ETF at a time (📡 IGV or SOXX, that stock is the whole test portfolio: 100 sh + cash): close ≥X% above its open → sell X% of portfolio value into cash, ≥X% below → buy it back (cash-capped, optional starting cash). Price chart (raw/2-axis or indexed) with start marker, total-asset growth vs buy & hold, full trade log + CSV export, and a ⚖️ side-by-side dip comparison (IGV vs SOXX on identical settings: metrics table + overlaid indexed growth curves).

AI-assisted workflow for owning a focused portfolio of under 10 individual stocks. Screens a 164-name universe with a transparent 5-factor percentile score (quality / growth / value / momentum / risk, stocks ranked against stocks and ETFs against ETFs) built from real Yahoo Finance fundamentals plus 8 years of daily prices; per-name research page with red/green flags, price chart vs 200-day average, financial and dividend history and a thesis worksheet (why, what must be true, kill criterion); a basket builder that enforces the rules (max 8 names, 20% position cap, 35% sector cap, cash sleeve, no name without a written thesis) with correlation heat map and weighted P/E, yield, ROE, beta; and a SANDBOX that replays any basket of names through real history — equity curve vs SPY, CAGR, volatility, Sharpe, max drawdown, beta, plus crash replays of COVID, the 2022 rate shock, Q4 2018 and the worst 20 sessions for SPY — with savable ideas and CSV export. Paper-trade journal tracks ideas against SPY. Data: ~/ai-invest/invest.db + invest-data.json, refreshed by fetch_invest.py; offline single-file build in ~/ai-invest/ai-invest-offline.html.

TAS (son) and DIS (daughter) SY 2026-2027 calendars overlaid into one 12-month view, July 2026 to June 2027: red = both schools closed, green = TAS closed only, blue = DIS closed only. TAS PD / teacher-training days count as days off (purple PD badge). Weekend toggle, school badges, tap-to-jump month chips, a day-off list grouped red/green/blue, and a source table showing every closure the two school calendars state. Single self-contained HTML file — works offline.

Auto-detected — add an entry to apps.json for a nicer title, icon and group.

Harness page for every Precalculus exercise set (Larson). Each set opens as a one-question-at-a-time app with a step-by-step solution button, and can also be downloaded as a single self-contained HTML file that works offline with no server.

Every exercise from the Chapter 1 Review (Functions and Their Graphs) - 110 questions - grouped by section so one section can be revised at a time: pick 1.1 to 1.7, read that section's printed "What Did You Learn?" summary, then work its questions one at a time with a step-by-step solution for each. Offline single-file copy on the harness page.

Every exercise from the Chapter 2 Review (Polynomial and Rational Functions) - 166 questions - grouped by section so one section can be revised at a time: pick 2.1 to 2.8, read that section's printed "What Did You Learn?" summary, then work its questions one at a time with a step-by-step solution for each. Offline single-file copy on the harness page.