While not a "frontend" to Anki, I built Mochi[0] in part because I was also frustrated with Anki's UI/UX and it supports importing Anki decks to an extent. It

While not a "frontend" to Anki, I built Mochi[0] in part because I was also frustrated with Anki's UI/UX and it supports importing Anki decks to an extent. It uses a similar scheduling algorithm to Anki, but it's based on simple markdown note cards, and has some features around that as well, such as bi-directional link references. [0] https://mochi.cards/ https://mochi.cards/