SciChart® the market leader in Fast WPF Charts, WPF 3D Charts, and iOS Chart & Android Chart Components
The value of SciChart in Silverlight is the browser hosting capability. With Silveright on its way out, there appears to be no replacement for SciChart in a browser. However, there is a very good public domain project called Fayde that has re-implemented the Mono Moonlight code as Typescript. Fayde lets you port C#/XAML to Javascript surprisingly easily.
Have you looked at Fayde, and do you foresee a (possibly stripped-down) SciChart version for Fayde?