Notifications don't work. It's a shame, because I wanted to buy a subscription. [EDIT] Okay, I already know what's going on. The operating system of my smartphone is MIUI. This app's notifications work when the battery saver mode is turned off. At the same time, in the application settings I have the option: "No restrictions - battery saver doesn't restrict app's activity." Other applications similar to this one (ToDo, habits) work with this option and at the same time enable battery saving.