This is nearly perfect, both aesthetically and functionally. But!... – UniChar — Unicode Keyboard Review

I could not for the longest time figure out why certain blocks of characters were greyed out (still haven't figured out why you can't choose to pay, though). Why? Because when you press the most logical part of the UI, which is a little sentence saying you can unlock it, that option is also greyed out and nothing happens, not even the haptic feedback of vibration. Now, I'm going nuts with combinations of long presses, swiping, regular presses, because all I want to do is throw the upgrade fee (a very tiny fee BTW) at the developer. Ah, I think I forgot to mention the part where everything from the app icon to the way the app is structured is classy and functional and exactly the way free applications should look. Nothing flashy, but it looks crisp and I love the way it's divided into logical families of characters as opposed to any other Unicode app which are divided into silly categories like "hearts!" or "happy faces!"...since I can't implement Fira Code on this iPad to play around with cool and USEFUL ligatures, I fin@ d myself using this keyboard all the time. The reason I can't seem to purchase your app in game and probably result in a matter of seconds, so help me out? Let me know how to get out of this godforsaken gray jungle.
Review by sin ch on UniChar — Unicode Keyboard.