I've decided for the Praktika app because pro-version was accessible, and I had a better experience of its free version than by similar ai-apps for English speaking practice. However, there sometimes are minor issues regarding fails by loading lessons. Updating or restarting the app/mobile phone helps. Overall, I enjoy the Praktika app and recommend it, especially to people with at least basic A1-A2 english levels or higher. I think it might not be a good fit for total beginners.