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When comparing FLTK vs Ultimate++, the Slant community recommends FLTK for most people. In the question“What are the best cross-platform GUI toolkits?” FLTK is ranked 12th while Ultimate++ is ranked 22nd. The most important reason people chose FLTK is:
It's simple design and lack of more advanced C++ features makes it easy for beginners.
Specs
Question Ranking
Pros
Pro Simplicity
It's simple design and lack of more advanced C++ features makes it easy for beginners.
Pro Fast
Well-designed widgets, coded with careful attention to rendering/execution speed.
Pro Stable
FLTK code developed more than 10 years ago still compiles and runs perfectly, without changes.
Pro Lightweight
Uses a limited and lightweight design and restricts itself to solely GUI functionality. Because of this restriction, the FLTK hello world example is only about 100 KiB.
Pro GUI designer
Fast Light User-Interface Designer (FLUID) included.
Pro Visual designer
Pro Simple to use
The whole framework is easy to use.
Pro Documentation and help tool
Pro Code analyzer
Pro Easy to learn
The whole framework is easy to learn thanks to multiple tutorials.
Pro Free
Pro Helpful community
Cons
Con Can be too simple for some projects
FLTK offers far fewer widgets than most other toolkits.
Con Does not look like a native application
Because it uses non-native widgets, it doesn't look like a native application on any platform.
Con Strictly C++
Con This is an application development framework not simply a GUI toolkit / library API
It is designed for you to develop your whole application using it, not just your GUI. Most people probably are not really looking for that.
