I-Howl ingumhleli wenhloso evamile ehlose ukuba lula futhi ibe ngokwezifiso ngokugcwele. Yakhelwe phezu kwesikhathi sokusebenza se-LuaJIT esishesha kakhulu, futhi inganwetshwa nge-Lua noma nge-Moonscript. Ine-UI minimalistic eqhutshwa ikakhulukazi ikhibhodi.