When comparing raylib vs Flax Engine, the Slant community recommends Flax Engine for most people. In the question“What are the best game engines for point & click adventure games?” Flax Engine is ranked 54th while raylib is ranked 59th. The most important reason people chose Flax Engine is:
Can be used for free until you hit a rather high revenue cap, at which point you have to pay royalties.
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Pros
Pro Simple
Very good for begginers who are looking for game FRAMEWORKS.
Pro Support forum
Though it's a small project, it has a forum on the webpage with helpful content available.
Pro Free
Can be used for free until you hit a rather high revenue cap, at which point you have to pay royalties.
Pro Powerful C# scripting
C# scripting is really well made, comparable to Unity, but without any of the legacy cruft.
Pro Multiplatform
Supports most platforms, including Windows, Linux, Android, Nintendo Switch, ...
Pro Modern rendering backend
Has a very modern, performant and beautiful rendering backend.
Pro C++ support
The entire core is written in C++ and it supports writing game code in C++. The interoperability between C# and C++ is also nothing to scoff at.
Pro Supports multiple IDEs
Works with any text editor and comes with proper support for Visual Studio, VSCode and Jetbrains Rider.
Pro Excellent documentation
The documentation is well written, up to date and accepts improvements from the community.
Pro Great and extensible editor
The editor is both powerful and simple. My favourite part is how easy it is to extend the editor with custom magic.
Pro Source code available
The entire source of the engine is available on Github, though not under an open source license.
Cons
Con Just coding
Lack of an interface, visual help or auto-debugging could make it difficult to use for a complete beginner.
Con New software
As is standard with new software, not all of the bugs have been ironed out yet.
Con Few plugins
Unlike more mature engines, there isn't a vibrant ecosystem of plugins yet.
Con Not open source
While the source code is available, it's not quite open source
Con Not latest C# version
It uses Mono and is still on some variant of C# 7.
Con No OpenGL support
It only supports modern APIs, namely Vulkan and DirectX. This means that it won't run on very old machines.