Vowels (2017)

Vowels is an esoteric programming language created in 2017 by Ethan Howell. In a Vowels program, the only valid symbols are the upper and lowercase English vowels (including y) and all other symbols (including whitespace) are ignored. The full Vowels program specification and interpreter is available on GitHub.

HelloWorld.vw
ue  yeouo euea euai euai euoa eaiu eaao eioo euoa euou euai euee eaai eeoe eeee y

Cat.vw
ieeyyu uae iaeyyu uie o  o   y