YJ

Yik Jin
builds things.

Small apps, odd tools and the occasional website, built with a lot of help from AI. Some are useful. Some are just fun.

~/builds $ ls   run-sea   hello-ai   one-engine   elitestay   yours-calmly   first-experiments   early-apps

On the workbench

livetinkeringretired
live · running × data

Run SEA

A calendar of road races across 10 Southeast Asian countries in the next 12 months, plus a lab that ranks your finish time against many others in the region. A data-driven approach to a passion.

runsea.run
WHAT I LEARNEDA passion is just a dataset you haven’t cleaned yet.
live · for AI

Hello, AI

A page written for AI assistants, so they get the facts about me right. Humans welcome.

alexlowyikjin.com
WHAT I LEARNEDIf you don’t tell the machines who you are, they’ll guess. Confidently.
tinkering · engine

One engine, many sites

A reusable engine that turns a list of places into a full directory site. Same engine, different worlds: races, hotels and more.

WHAT I LEARNEDBuild it once, launch it everywhere, then spend a week fixing “everywhere”.
live · travel

EliteStay

In-depth loyalty-program hotel reviews across 82 cities in Southeast Asia, built on the engine.

elitestay.travel
WHAT I LEARNEDPoints make you loyal. Data makes you picky.
live · games

Yours Calmly

A calm place to play: three short, gentle games at your own pace. Free, no sign-up.

yourscalmly.com
WHAT I LEARNEDBuilding a game takes an afternoon now. Getting someone to put their phone down and play it is the real game.
retired · long, long ago

Early apps

Before AI could write a line of code, I published my own apps on the App Store.

WHAT I LEARNEDToo many apps, not enough focus. AI fixed the first problem. Not the second.

First experiments

no install, no sign-up

Before the bigger builds, my first experiments with AI were single HTML files. Download one, open it in any browser, and it just works. Offline, even. Mostly.

my favourite

MJ Tally

Keeps score for a four-player mahjong table so nobody has to do the maths. Or the arguing. Tap “Players” to put in your own names.

Games

Sudoku, 2048 and Tetris in one file. For when “just five minutes” is a lie.

Chord Builder

Tap chords into a progression and see exactly how to play each one. Building it was easier than learning guitar.

SGD FX

A quick currency converter from Singapore dollars, with live or hand-set rates. For checking whether the holiday is cheap or just feels cheap.

On the bench

Claude CodePerplexityAstroPythonGitHub Pages

The tools change every few months. The habit of shipping small things doesn’t.

“You never have to restart if you don’t give up halfway.”