Open tools, one at a time.
Now running three web tools and two iPhone apps — more taking shape.
jdgrid is a growing collection of small, focused products — browser-based tools for developers and native iPhone apps — each built around a single job and shipped on its own. The web tools run entirely client-side, need no account, and come with their own documentation.
No login walls, no paywalls, no dark patterns. The projects below are live today, with more taking shape.
Projects
76 browser-based dev tools and 118 guides — JSON formatting, JWT decoding, regex testing, Kubernetes YAML, and much more. No install, no sign-up; everything runs in your browser. Available in Korean and English.
yutils.jdgrid.com →Compare live prices and rankings across crypto, US stocks, and Korean stocks, then backtest your own strategies on daily candles — returns, max drawdown, and Sharpe, right in the browser.
trading.jdgrid.com →Search, news, Wikipedia, shopping, and culture trends from Korea and around the world, gathered on a single page — see what's surfacing today across sources from Hacker News to music charts.
trends.jdgrid.com →An iPhone focus timer where every finished session becomes a star. Settle in with sixteen soundscapes, then rotate and explore the galaxy your focused time has built. Coming soon to the App Store.
apps.jdgrid.com/trance →A baby tracker made for couples — feeds, sleep, diapers, and twelve more care moments sync between both parents in real time, with a Lock Screen widget and offline support. On the Korean App Store.
apps.jdgrid.com/saegeun →A new tool taking shape — details to come.