There are millions of good charts in the world, much better and with greater capabilities. For example TradingView.com, these charts I can recommend wholeheartedly. What can I say, all the charts on my site are based on the free LightWeightChart TradingView engine.
What I have here is simply just a programmer's play. And on the other hand, I just make for myself what I need when trading, as I am comfortable using these charts. Well, and I have it for free, because unfortunately, most of the reasonably good charts are either paid or have big limitations in the free version. This modlul is simply made only as a hobby, I do not guarantee or promise anything that it will always work well. Anyway, just like everything on my site :-)