Complicated to activate, not intuitive to use. It does work, but really... this is a Javascript code inside a web page that you add as a bookmarklet. Not really an app! I resent buying this for 10$ and now cannot get my money back because Apple says it is with the developer that this should be solved. But only Apple can give a refund... Unless you really really need this, Id avoid it. Not for the non-techies out there.
Gustave421 about Tap Dictionary - In browser definitions, v1.0