I revise my rating of Numi 2, which I wrote in 2013. Numi 2, unlike Numi, works very well and I love how handy it is in the menu bar. No more Calculator app suits me fine, and including text and print features I rate Numi 2 (conservatively) 4 stars!
That's the good news. The bad news, I'm afraid, is that Numi 2 appears no longer to be available to buy. I repeat my disappointment with the original Numi, and want to ask the developer what the heck is going on, that a good, convenient menu bar app is being replaced with an older one (albeit free). I'm keeping Numi 2 and not taking the developer up on version 3, free or otherwise. Numi 3 is an instance of app de-volution. Don't bother with it a second! Barely 1 star. Average 1.5 stars