I open-sourced the financial charting library we use in production (opens in new tab)

If you've ever tried to build a trading dashboard, a crypto portfolio tracker, or any financial app, you probably ran into the "charting problem" pretty quickly. The standard industry approach goes something like this: Embed a heavy from a 3rd party provider. Realize it doesn't quite match your app's UI/theme. Struggle with limited postMessage APIs to push real-time data. Watch the UI lag when you try to render multiple charts on the same page. I got tired of fighting with iframe emb...