This is one of those questions that&#x27;s hard to answer, because by framing the answer you&#x27;re already analyzing the UI, thereby making it less confusing.<p>One irritant was getting the phrasal popup repeatedly. Once it&#x27;s appeared, I pretty much already know I can&#x27;t do that (as noted by others already). The default should be something like deselecting the first word to allow me to look at the other. Put a non-modal message somewhere obvious that says &quot;hey, if you log in you can see phrase translations, too&quot;.<p>I think your idea of seamlessness with a cookie is really promising. Let me see what it does, but warn me that I&#x27;m going to run into a limit. Maybe.<p>There was no real try-it-out-now link (that I saw - I&#x27;m not looking at it now, just reporting my perceptions at the time) except for trying it out on the Spanish quote - which again, I found remarkably clever. But the result is that I wasn&#x27;t entirely clear about what you were actually offering. Possibly a little picture of the main UI somewhere on the front page might help. Not sure on that - as I said, it wasn&#x27;t that difficult to poke around and find things once I decided I was interested, but I normally don&#x27;t notice that phase at all, if you see what I mean.<p>Hope that helps.