I’m sure this has already been spoken about within Tofugu.
Please consider adding Progressive Web App (PWA) enhancements to WaniKani.
I’ve been pleading for an offline version of WK for around four years. The main reason for this is that my main time to use WK is during my commute which has very poor signal.
I can understand what a massive undertaking making WK offline would have been back in 2012.
webworkers service workers to cache files, and serve offline requests, as if it were never offline.