For folks suggesting a PWA would solve this problem: the Language Transfer app caches audio files. PWA on all platforms have a storage limit (some % of free sto

For folks suggesting a PWA would solve this problem: the Language Transfer app caches audio files. PWA on all platforms have a storage limit (some % of free storage on the device). So it might not work for folks who tend to keep only a couple of percent space free on their phones. Of course, there are other ways to use LT on your phone (download the files and play them with any audio player). But the app has a nice clean interface that reduces distractions, which is important because you need to tap 'pause' pretty often to get the best out of the experience.