Ko Howl he etita kaupapa whanui e whai ana kia maamaa me te tino whakarite. He mea hanga ki runga ake o te waa whakahaere o te LuaJIT tino tere, ka taea te whakaroa ki te Lua, ki te Moonscript ranei. He UI minimalistic te nuinga e peia ana e te papapātuhi.