The booking half of a resort site: per-night availability across room types, seasonal and length-of-stay pricing, and refusals that name the night that blocked the stay rather than shrugging.
- TypeScript
- React
- Vitest
Open demo
33 tests
Lab
Things you can play with
Everything here runs in your browser — no server, no database, no account. The tuner needs microphone permission, requested only when you press start, and the audio never leaves the page.
Products
Table reservations with turn times and table combining, plus a menu whose modifiers actually affect the price. Slots are offered only when a real table can seat the party for as long as it will be sitting there.
- TypeScript
- React
- Vitest
Open demo
31 tests
Inventory, costing and billing for a neighbourhood shop. Quantities are derived from stock movements rather than stored, costs are weighted-average, and receipts extract VAT from prices that already include it.
- TypeScript
- React
- Vitest
Open demo
33 tests
One CRM across the resort, the coffee shop and the store. Scored identity resolution rather than a customer table, segments derived from transactions rather than tags, and consent that has to be proved before anybody can be contacted.
- TypeScript
- React
- Vitest
Open demo
55 tests
Browser audio
A chromatic instrument tuner that listens through the microphone and reports the note and its deviation in cents. The pitch detection is a from-scratch implementation of the YIN algorithm — no library — and it is accurate to under a cent on synthetic signals.
- Web Audio API
- TypeScript
- Canvas
Open demo
A step sequencer whose timing does not drift, does not stutter under load, and does not fall apart in a background tab. Every drum sound is synthesised from oscillators and shaped noise, so the whole instrument ships as zero bytes of audio assets.
- Web Audio API
- TypeScript
- React
Open demo
An interactive fretboard that finds playable fingerings for any chord in any tuning by searching the neck under physical constraints. It ships no chord dictionary, which is why it works in tunings nobody has tabulated.
- TypeScript
- SVG
- Web Audio
Open demo
Audio requires a user gesture to start, so nothing plays until you press a button. Best with headphones for the tuner, to keep the speakers out of the microphone.