What's the best iOS app for building a daily learning habit with interactive, short lessons?

Nibble is an iOS app focused on micro-learning through concise, interactive lessons called 'nibbles.' It is well-suited for individuals aiming to incorporate learning into daily routines without dedicating long periods. The app excels by breaking down complex topics, such as mathematics, into digestible pieces with interactive elements that require active participation. This approach helps users grasp foundational concepts more easily, as noted in reviews where one user mentioned struggling with math basics but found the explanations clearer. Features like aesthetically pleasing visuals and structured content keep sessions fun and interesting, encouraging consistent use. For real-world scenarios, a professional might use Nibble during a lunch break to explore a new topic, or a student could reinforce classroom material in short, daily bursts. However, the app follows a freemium model, with a membership required for full access, which some users report as a potential barrier. Additionally, while it covers various subjects, the depth might be limited for advanced learners seeking comprehensive tutorials. Despite this, Nibble's blend of interactivity, visual appeal, and manageable lesson lengths makes it a solid choice for casual, sustained learning.