My old currency converter is dying with iOS 11, so I went to look for a replacement. This looked good and had good reviews so I tried it, and it's good... but needs a little work.
First, it's really quite solid; it's simple in basic use, and the clever bit about the numbers fading and sliding off to the right to clear the values is a really nice touch. The main-use design is clean. And that just makes the other problems stand out more.
First, a detail: flags are not square, and while it might have been a design choice to try to make it look clean, it just ends up making it look kind of Windows 3-ish. You have the horizontal real estate to use rectangles if you want. Conversely, either make the flags circles (trendy but not functional imo), or round the corners (more in line with Apple), or something.
Selecting currencies is mystifying until you figure out what's happening when you tap, and this needs help. Perhaps a two tap setup where you select the one you want to replace, then the one you want to replace it with? Maybe drag and drop so you can specify which you want to use and which to replace in one gesture? At the very least add some animation so we can see what's happening when you tap a new currency. The current model is hard to figure out and hard to use.
And last: you need an actual control to poll or not poll for updates. Yes, I'd like an "update now" gesture, but I mean something to turn automatic updating OFF if you're in a country where you have a very limited amount of data or it's very expensive. I often want to still let my phone use, say, maps, but have as many things as possible shut off so they don't vampire my data little by little. Having a control in the app vs relying on iOS's "use cellular data" switch would be comforting to know that a positive and easy-to-get-to control was there.
So: good foundation, hope to see some additions and changes. If it had some of these, I'd absolutely buy the Premium. (Heck, put that "go offline" switch in Premium and I'd buy it.)
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