I can wholly recommend Mochi: it’s great looking but also quickly becoming feature competitive with Anki. It’ll be a long time before anything hits the long tail of Anki features, but I find the trade offs to be more than worth it.
In addition to the other comment, it's also missing a lot of card types that Anki supports. However, I think this is made up for by the knowledgebase features, so you can use it to take notes stored with / linked to by your SRS.
