5 stars: I'm an old man in my 30s now haha and found this to be a fantastic app to stimulate my mind. Takes me back to university days where my maths was on point, and is challenging whilst having fun with the timer etc. Great work dev. As for the complaints with payment.. what do you expect from tight people who can't even watch an ad so you make some money. It speaks more of them than you.
3 stars: It has ads. That's not a problem as it stated that it has ads. But, in addition to the ads, it seems that one has to pay for many of the lessons (for want of anything better to call them). It looks like only a few are included in this app. I would gladly pay for a full featured program WITHOUT ads and with all lessons included. As it is, I have gone through what us included and will probably delete it now.
5 stars: Previously mentioned the theme settings being off, now the maker has solved this issue very well. It's great but I would prefer to purchase it without the ads, this is totally worth a fiver, I mean it's extremely well made. I like the notification I get, trying improve daily. It's succinct and has an enormous range of "worksheets" to go through. I like the learning system and the general overview of the tasks and the hints are very clear too. I like it a lot!
4 stars: It's good app. We do lot of calculations on daily basis. But some times we recall our school days by doing some calculations. This app is really good for many users. But you guys can provid...