I have tried every single Mac translator app that is free or allows a free trial. This is the only acceptable one. It's not perfect, but it works for me. The keyboard shortcut works in Calibre reader, which is very important since the mac dictionary does not work in there, but I wish I didn't have to copy the text first. The shortcut should automatically translate the selected text in my opinion. I like the popup when selecting text in safari. The sound does not work for russian words, but that is not a deal breaker because I have other ways to hear the audio. Thank you for this lovely app.