Thank you for your inquiry.
We offer GroupDocs.Comparison for .NET back-end and GroupDocs.Comparison Cloud API.
For document conversion, we offer GroupDocs.Conversion for .NET back-end and GroupDocs.Conversion Cloud API.
For documents rendering/viewing purpose, we have GroupDocs.Viewer for .NET back-end and GroupDocs.Viewer Cloud API.
Now, let us elaborate you about our back-end APIs. These back-end APIs are UI-agnostic and can be integrated in any .NET application, irrespective of platform (windows form, console, web etc). They don’t require any third-party plugins or references for processing. All you need to do is to add the API reference or install the NuGet and start implementing API functionalities. Our cloud product families also includes SDKs for different platforms including .NET.
Now, it depends on your business needs, either to choose back-end APIs or Cloud. We’d recommend you to explore links/pages we shared and see how both APIs work.
Please let us know, if you need more information from us. We’d further assist you.