When comparing Morphic vs Tk, the Slant community recommends Tk for most people. In the question“What are the best cross-platform GUI toolkits?” Tk is ranked 9th while Morphic is ranked 36th. The most important reason people chose Tk is:
Once you understand how to style, the styling can look great.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Multiple languages
Including Python, JavaScript, Self, Smalltalk, and Objective-C.
Pro Easy styling
Once you understand how to style, the styling can look great.
Pro Great for beginners
Easy to pick up and run with it.
Pro Easy and good looking in Mac, Linux and Windows
Pro Bindings for several languages
Bindings for Python, C, C++, Ruby, Perl, Go, Java, Haskell and more, see Languages with a Tk binding.
Cons
Con Base looks are garbage without a good amount of styling
Going with the base look for your app is a bad idea because it looks like garbage with the defaults.
Con C# support lacking
Although the Eagle Project exists, which offers Mono and .NET Core support, C# support is not standard.