Utilities
Parse SMILES, detect the senior functional group, find the longest carbon chain, and emit a teaching-oriented IUPAC name with E/Z and R/S hints.
iupac-organic-naming-toolDevelopment
Compare two JSON payloads and render a visual HTML diff with path-level additions, removals, changes, and statistics
json-diff-visualizerHealth
Estimate your daily protein target in grams from body weight and activity level. Coefficients (g per kg bodyweight) follow the ISSN 2017 position stand and the Morton et al. 2018 meta-analysis.
protein-intake-calculatorHealth
Solve for pace, finish time or distance given the other two. Enter a known distance and either a finish time or a pace, and get the missing value plus speed and optional Riegel race predictions.
running-pace-calculatorHealth
Find the best bedtime or wake time based on the brains 90-minute sleep-cycle rhythm. Enter a target wake time and get recommended bedtimes, or enter a bedtime to project forward.
sleep-calculatorGames
Classic hangman word-guessing game. Guess the hidden word letter by letter; six wrong guesses ends the game. Three difficulty levels, with general, animals, food, and science categories.
hangman-gameText Processing
Score resume bullet points line-by-line: strong-verb matching (Implemented/Led/Owned vs Worked/Helped), quantified-metric detection (%/$/counts/time), length & repetition audit, industry buzzword blacklist (synergy/leverage/rockstar/ninja). Returns 0–100 per bullet with rewrite suggestions and synonym swaps.
resume-bullet-impact-meterMath & Numbers
Exponential decay for radioactive isotopes and drugs: remaining amount, derived half-life, time to target, or steady-state accumulation. Uses N(t) = N0·e^(-λt).
half-life-calculatorGames
Classic rock-paper-scissors with a random opponent or an adaptive AI that learns your patterns. Shake animation, running score, and history.
rock-paper-scissorsGames
Classic 3×3 tic-tac-toe against a random AI, an unbeatable minimax AI, or a friend. Keeps score across rounds.
tic-tac-toeMath & Numbers
Solve pressure, force, or area from P=F/A, and convert between Pa, kPa, MPa, bar, atm, psi, Torr, inHg, kgf/cm²
pressure-conversionMath & Numbers
Practice significant-figure rules with step-by-step feedback: count sig figs, round to N sig figs, convert to scientific notation, and propagate through +/−/×/÷.
significant-figures-sandbox