AppVayor & Travis

Why are there two CI softwares included on github?
AppVayor always failes to compile while Travis succeeds.
Is there any benefit of having two / are they ment for different tasks?

Travis CI compiles and runs tests on Linux and AppVeyor do it on Windows. However, a recent update of AppVeyor made the build process invalid causing a crash when running the tests. That’s why AppVeyor has been failling for a few weeks.

Ah I see, thanks for clarification.