When comparing Fyne vs GTK+, the Slant community recommends GTK+ for most people. In the question“What are the best cross-platform GUI toolkits?” GTK+ is ranked 11th while Fyne is ranked 24th. The most important reason people chose GTK+ is:
Supports a lot of languages like Java, Javascript, C++, Python, Pascal, FreeBasic and Haskell, but support for languages like C# and GO is only partial.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Mobile support
Android and iOS are supported.
Pro Easy to learn
Simple and consistent API.
Pro Permissively licensed
Fyne is licensed under the 3-clause BSD license, which has fairly lax restrictions on usage.
Pro Language bindings
Supports a lot of languages like Java, Javascript, C++, Python, Pascal, FreeBasic and Haskell, but support for languages like C# and GO is only partial.
Pro Nicer user interface when using PyGi
Creating cross platform enterprise apps with PyGi and with the help of Gtk Themes makes them look great.
Pro Working with GTK focused Vala is great
Vala is made to make GTK easy [as well as for other things] and it really does, and makes it easier than working with C/C++, Python, or any other,
Cons
Con Go specific
Fyne is only usable in Go applications.
Con Sucks for traditional applications
GTK3 added CSD widgets and added a lot of paddings to make widgets bigger for touchscreen use, GTK4 also even removed Menubar and Toolbar widgets.
Con No menuicons or mnemonics
Gtk3 has removed the support of icons and mnemonics making navigating menus just terrible for the use with a keyboard. Sure there are some hacks to make them working again but they will never work as they did/do work in Windows, GTK2 or QT.
Con Terrible integration
Looks and feels like an alien on all other platforms than GNOME.
Con Promotes Wayland as the standard X11 server on Unix
Lets face it, Wayland is not a replacement for XORG since Wayland works currently only in GNOME and there are many issues. Some desktops and window managers will never get ported to Wayland and it is not available to all Unix and Unix-like systems. X11 on the other hand is available for almost everything, so it will be available for the next decade or even longer.
