The Pro version (which the "APK" typically attempts to unlock) provides several advantages over the standard free tier:
: A major "Pro" feature at the time, allowing users to download entire courses to study without an internet connection. Note: Recent versions of the app have since retired this feature in favor of cloud-based AI tools. The Pro version (which the "APK" typically attempts
: The core algorithm that predicts when a word is about to leave your long-term memory and prompts you to review it at that exact moment. The Pro version (which the "APK" typically attempts