1. Problems with registration
2. Undertranslated - there are places on the site where the translation is inaccurate or incomplete.
3. I wanted to ask a few questions before buying, but apparently, support rarely responds. The developers complained that there were only 4 people, but guys, it would take no more than half an hour for one person to answer a few questions.
4. Asks to pay premium when I already have premium.
5. Statistics on completed cards do not work. I tried.
6. It is impossible to share the file - the link does not work.
7. Some of the explanations during the answers are a bunch of symbols of such a plan - При гнии важн комплексное
8. The site and the application synchronize with a long delay
9. The application slows down when swiping cards and opening the menu
10. The layout in the application is broken (iPhone 13)
11. The new folder can only be named in English
12. Card shading does not work

I would not recommend it.