Sapper (Svelte) vs Knockout: What are the differences?

Developers describe Sapper (Svelte) as "A framework for building high-performance universal web apps, powered by Svelte". It is a framework for building web applications of all sizes, with a beautiful development experience and flexible filesystem-based routing Unlike single-page apps, Sapper doesn't compromise on SEO, progressive enhancement or the initial load experience — but unlike traditional server-rendered apps, navigation is instantaneous for that app-like feel.. On the other hand, Knockout is detailed as "Create rich, responsive UIs with JavaScript". It is a JavaScript library that helps you to create rich, responsive display and editor user interfaces with a clean underlying data model. Any time you have sections of UI that update dynamically (e.g., changing depending on the user’s actions or when an external data source changes), it can help you implement it more simply and maintainably.

Sapper (Svelte) and Knockout belong to "Javascript UI Libraries" category of the tech stack.

Some of the features offered by Sapper (Svelte) are:

• Server-side rendering
• Fast
• Progressive Web App support

On the other hand, Knockout provides the following key features:

• Easily associate DOM elements with model data using a concise, readable syntax
• When your data model's state changes, your UI updates automatically
• Implicitly set up chains of relationships between model data, to transform and combine it

Sapper (Svelte) and Knockout are both open source tools. It seems that Knockout with 9.84K GitHub stars and 1.55K forks on GitHub has more adoption than Sapper (Svelte) with 6.07K GitHub stars and 394 GitHub forks.