Targeted review sessions based on past mistakes.
Using Duolingo in a mobile or desktop browser often bypasses the heart system found in the app. Download Duolingo Plus apk
Furthermore, from a pedagogical standpoint, the "unlimited hearts" feature isn't always beneficial. The heart system is designed to encourage accuracy. When there are no consequences for mistakes, some learners may rush through lessons without truly absorbing the material, ultimately slowing their actual fluency. Better Alternatives Targeted review sessions based on past mistakes
Modded apps do not receive official security patches or new feature updates. As Duolingo updates its servers, the modded app often breaks, leading to crashes or loss of progress. The Ethical and Educational Impact from a pedagogical standpoint