ʻO Howl kahi mea hoʻoponopono maʻamau e manaʻo e māmā a maʻalahi hoʻi. Kūkulu ʻia ma luna o ka holo wikiwiki ʻana o ka LuaJIT, a hiki ke hoʻonui ʻia ma ka Lua a i ʻole ka Moonscript. Loaʻa iā ia kahi UI minimalistic i alakaʻi nui ʻia e ka keyboard.