5 stars: A great app if you like challenging content. The learning curve can be a bit steep, but the courses are impressively well designed and do a good job training your intuition rather than just making you memorize content. One minor improvement I'd like to see is whiteboard support for the puzzles: Many require pen and paper to solve and having those nearby can be a bit of a hassle.
3 stars: Good idea, very interesting app, but too expensive. Maybe not for USA, but for a standard in my country it is 10x more than I would give for such app. For that money I can pay a real course which i could have benefit from. This app didnt prove me that it would give me enough for the money, and it is annoying when i have to give a billing method before I get a free trial.
4 stars: Could you please: 1. Allow page flipping only from the margins if the page? Otherwise it's hard to scroll some horizontal formulas that appear on the page. 2. Please allow zooming of the page. Sometimes it gets too small to read on a mobile phone. 3. Why did you change the colors and layout? The former one was better!
5 stars: Just started about a week ago since I've moved through two sections of instruction a day. I've been able to fully grasp each concept for before moving to the next. This is definitely worth th he subscription
4 stars: Very awesome information in an easily digestible format. Tons of high quality fresh content. I just wish the app had a dark mode since I like to use it at ...